Cisco MC3810-V - Concentrator - External Specification sheet

Voice over ATM Switched Virtual Circuits on the Cisco MC3810 1
Voice over ATM Switched Virtual
Circuits on the Cisco MC3810
This document describes voice over Asynchronous Transfer Mode (VoATM) switched virtual
circuits (SVCs) for the Cisco MC3810 multiservice access concentrator.
This document includes the following sections:
•Feature Overview, page 1
•Supported Platforms, page 4
•Supported Standards, MIBs, and RFCs, page 4
•Prerequisites, page 4
•Configuration Tasks, page 5
•Troubleshooting Voice over ATM SVCs, page 16
•Monitoring and Maintaining Voice over ATM SVCs, page 19
•Configuration Examples, page 20
•Command Reference, page 22
•Glossary, page 30
Feature Overview
VoATM SVCs allow the Cisco MC3810 to transfer voice data dynamically and as needed—without
tying up the resources required for static, manually provisioned permanent virtual circuits (PVCs).
An SVC connection is initiated for each call, and each request includes bandwidth and
quality-of-service (QoS) information required for the connection. SVCs are ideal for networks that
are highly interconnected, where scalability is essential, and in situations where traffic is sporadic.
In addition, service providers often offer more advantageous, usage-based pricing options for SVCs.
VoATM using SVCs on the Cisco MC3810 includes all of the voice features that the Cisco MC3810
supports for PVCs and for Frame Relay transport. Like other Cisco voice implementations, VoATM
using SVCs is based on dial peers and uses ATM Adaptation Layer 5 (AAL5).
ATM SVC service operates much like X.25 SVC service, although ATM allows much higher
throughput. It requires a signaling protocol between a router or a multiservice access concentrator
and an ATM switch. The ATM signaling software provides a method of dynamically establishing,
maintaining, and clearing ATM connections at the User-Network Interface (UNI). In UNI, the router
serves as the user and the ATM switch is considered the network. The router does not perform
call-level routing. Instead, the ATM switch does the ATM call routing, and the router directs packets
through the resulting circuit.

Feature Overview
2Cisco IOS Release 12.0(7)T
VoATM SVCs include the following features:
•User-to-Network Interface (UNI) 3.1 signaling procedures, including support for the following
types of information elements:
—Traffic descriptor
—Broadband bearer capability
—ATM addressing information
•The implementation adheres to the required features of ATM Forum User-Network Interface
(UNI) signaling specification, version 4.0, simultaneously supporting permanent virtual circuits
(PVCs) and SVCs.
•Network Service Access Point (NSAP) addressing for private networks
•Interim Local Management Interface (ILMI)
•24 simultaneous voice calls per Cisco MC3810 system
•Support for tandem switching
Note The Cisco MC3810, in addition to supporting video and voice over ATM SVCs, also supports
data over ATM SVCs. Wide-Area Networking Configuration Guide and Wide-Area Networking
Command Reference provide more information about the commands and configuration steps
required for this capability.
Figure 1 Application for Voice over ATM Using SVCs
Local office 2
Regional office
Cisco
MC3810 Cisco MC3810
Cisco
MC3810
FXS FXS FXS
FXS FXS FXS
ATM PVC
& SVCs T1 or E1
22885
T1 or E1
T1 or E1
T1 or E1 PBX
PSTN
FXO
Local office 1

Benefits
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 3
Benefits The Cisco MC3810 multiservice access concentrator formerly supported only non-dial permanent
virtual circuits (PVCs) for ATM traffic.
SVCs offer the following benefits:
•Dynamic resource allocation is more efficient and flexible than in nailed-up PVC connections.
•Many service providers offer favorable pricing for ATM SVC service.
•Interface requirements are determined by total bandwidth needs rather than by the number of
different remote connections.
•SVCs support flat network topologies where each endpoint is separated by one hop only, offering
the following advantages:
—Simplifies design and management challenges.
—Improves voice quality because there is only one compression cycle—in contrast to schemes
where voice is compressed, decompressed, and compressed again.
—Reduces delays over designs with multiple hops.
RestrictionsThe following features are not supported.
•Direct E.164 ATM addressing
•Available Bit Rate (ABR) service
•Leaf-initiated joins (LIJs)
•ATM anycast, communication between one sender and the nearest of several receivers in a group
•Generic Identifier Transport (GIT), which uses an information element to carry identifiers
between two users
•Switched Virtual Path service, which is the grouping of SVCs to define a path (usually within a
single application) where the switch directs calls as appropriate
•Proxy signaling, where, for example, IP traffic is identified by class or precedence and an IP
router rather than the source host signals an ATM layer
Related Features and Technologies
The Cisco MC3810 also supports data over ATM SVCs. Wide-Area Networking Configuration
Guide and Wide-Area Networking Command Reference provide more information about the
commands and configuration steps required for this capability.

Related Documents
4Cisco IOS Release 12.0(7)T
Related Documents
For information about Cisco IOS configuration for voice applications, consult the following Cisco
IOS Release 12.0 documents:
•Voice, Video, and Home Applications Configuration Guide
•Voice, Video, and Home Applications Command Reference
For information about Cisco IOS configuration for ATM, consult the following Cisco IOS Release
12.0 documents:
•Wide-Area Networking Configuration Guide
•Wide-Area Networking Command Reference
For information about IOS configuration that is unique to the Cisco MC3810, consult the following
Cisco documents:
•Cisco MC3810 Multiservice Access Concentrator Software Configuration Guide
•Cisco MC3810 Multiservice Access Concentrator Software Command Reference
Supported Platforms
This feature is supported on the Cisco MC3810 multiservice access concentrator.
Supported Standards, MIBs, and RFCs
No MIBs are supported by this feature.
Other Standards
•ATM Forum document af-uni-0010.002, ATM User-Network Interface Specification V3.1
(1994), including support for the following types of information elements:
—Traffic Descriptor
—Broadband Bearer Capability
—ATM Addressing Information
•ATM Forum document af-sig-0061.000, ATM UNI Signaling Specification V4.0 (1996) with the
exceptions noted in “Restrictions” on page 3
•ITU recommendation Q.2931
•ITU-T X.213 and OSI Network Service Access Point (NSAP) addressing
•ATM Forum document af-ilmi-0065.000, Integrated Local Management Interface (1996)
Prerequisites
•Cisco IOS Software Release 12.0(5)XK or 12.0(7)T or a later release
•A configured ATM network

Configuring Network Clocks and Controller Settings
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 5
Configuration Tasks
Perform the following tasks to configure VoATM SVCs service:
•Set up clock sources, T1/E1 controller settings, and serial interfaces.
•Configure the ATM interface, including signaling and management PVCs.
•Set up voice POTS and ATM dial peers.
These tasks do not represent all of the configuration tasks required to set up your ATM network. For
more information, refer to the Cisco MC3810 Multiservice Access Concentrator Software
Configuration Guide and to the examples shown in the “Configuration Examples” section on
page 20.
Configuring Network Clocks and Controller Settings
Because voice communications require a continuous and tightly meshed data stream to avoid loss of
information, and PSTNs provide a variety of clocks, you must synchronize source and destination
devices to a single master clock. In the example that follows, the clock source is derived from a
device attached to T1 controller 0; then the clock source is distributed to the devices attached to the
local Cisco MC3810 serial ports and to T1 controller 1. Base clock source decisions on the network
configuration, and set up a hierarchy of clock sources, so that backup clock sources are available.
For details, see Chapter 4, “Configuring Synchronized Clocking,” in Cisco MC3810 Multiservice
Access Concentrator Software Configuration Guide.
This configuration task also includes the basic steps required for ATM support over T1/E1
controller 0.
Step Command Purpose
1Router# configure terminal Enter global configuration mode.
2Router(config)# controller {T1 | E1} 0Enter controller configuration mode for controller
T1/E1 0. ATM traffic is supported on controller T1/E1 0
only.
3Router(config-controller)# clock source line Configure controller T1/E1 0 to obtain the Cisco MC3810
clock source from an attached network device. This is the
default setting.
4Router(config-controller)# no shutdown Activate the controller.
5Router(config)# controller {T1 | E1} 1Enter controller configuration mode for controller
T1/E1 1.
6Router(config-controller)# clock source internal Configure controller T1/E1 1 to obtain its clocking from
the internal network clock Phase-Lock-Loop (PLL). In
this way, controller T1/E1 1 obtains clocking from the
T1/E1 0 controller source—the switch.
7Router(config-controller)# no shutdown Activate the controller.
8Router(config-controller)# exit Exit controller configuration mode.
9Router(config)# framing esf
or
Router(config)# framing crc4
Set the framing to Extended Superframe (ESF) format,
required for ATM on T1. This setting is automatic for T1
when the ATM mode is set.
Set the framing to CRC4, required for ATM on E1. This
setting is automatic for E1 when the ATM mode is set.

Verifying Network Clocks and Controller Settings
6Cisco IOS Release 12.0(7)T
Verifying Network Clocks and Controller Settings
To verify the configuration of network clock sources and controller settings, follow the steps below.
Step 1 Enter the privileged EXEC show network-clocks command to see the status of clock
source settings.
Router# show network-clocks
Priority 1 clock source(inactive config): T1 0
Priority 1 clock source(active config) : T1 0
Step 2 Enter the privileged EXEC show controllers t1 or show controllers e1 command to see
the status of T1/E1 controllers.
router# show controller t1 1
T1 1 is up.
Applique type is Channelized T1
Cablelength is long gain36 0db
No alarms detected.
Slot 4 CSU Serial #07789650 Model TEB HWVersion 4.70 RX level = 0DB
Framing is ESF, Line Code is B8ZS, Clock Source is Internal.
Data in current interval (819 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Data in Interval 1:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Data in Interval 2:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
10 Router(config)# linecode b8zs
or
Router(config)# linecode hdb3
Set the line coding to binary zero 0 substitution (B8ZS),
required for ATM on T1. This setting is automatic for T1
when the ATM mode is set.
Set the line coding to HDB3, required for ATM on E1.
This setting is automatic for E1 when the ATM mode is
set.
11 Router(config)# mode atm Configure the controller for ATM traffic. This allows the
controller to support ATM encapsulation and create
virtual ATM interface 0 for SVCs and PVCs. Controller
framing is automatically set to extended superframe (ESF)
on T1 and to CRC4 on E1. The line coding is
automatically set to B8ZS on T1 and to HDB3 on E1.
Channel groups, channel-associated signaling (CAS)
groups, common channel signaling (CCS) groups or clear
channels are not allowedon the trunk because ATM traffic
occupies all the DS0s.
12 Router(config)# network-clock base rate {56k | 64k}Set the network clock base-rate for the serial ports. The
default is 56 kbps.
Note At this point, you can also configure network
protocol settings such as IP hosts. For more information,
see the Cisco IOS Release 12.0 network protocol
configuration and command reference guides.
Step Command Purpose

Configuring ATM Interfaces
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 7
.
.
.
Data in Interval 96:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
!
Router# show controllers E1 1
E1 1 is up.
Applique type is Channelized E1 - balanced
No alarms detected.
Slot 4 Serial #06868949 Model TEB HWVersion 3.80
Framing is CRC4, Line Code is HDB3, Clock Source is Internal.
Data in current interval (292 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
.
.
.
Total Data (last 66 15 minute intervals):
9 Line Code Violations, 0 Path Code Violations,
1 Slip Secs, 0 Fr Loss Secs, 4 Line Err Secs, 0 Degraded Mins,
5 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Se
Configuring ATM Interfaces
In this section, the ATM interface is set up, including PVCs to carry signaling for SVCs. In addition,
an NSAP address for an ATM SVC is specified. For additional information, see Cisco MC3810
Multiservice Access Concentrator Software Configuration Guide and Cisco MC3810 Multiservice
Access Concentrator Software Command Reference.
You can also configure PVCs for voice communications. Wide-Area Networking Configuration
Guide and Wide-Area Networking Command Reference provide additional information about this
and other aspects of ATM configuration.
Step Command Purpose
1Router# configure terminal Enter global configuration mode.
2Router(config)# interface atm0 Enter interface configuration mode for ATM 0—the only
ATM interface that supports voice over SVCs.
3Router(config-if)# ip address ip-address mask Assign the IP address and subnet mask to the interface.

Configuring ATM Interfaces
8Cisco IOS Release 12.0(7)T
4Router(config-if)# atm voice aesa {default |
esi-address}
This command sets the unique ATM end-station address
(AESA) for an ATM interface that is using SVC mode for
voice.
The default keyword automatically creates an NSAP
address for the interface, based on a prefix from the ATM
switch (26 hexadecimal characters), the MAC address (12
hexadecimal characters) as the ESI (end station identifier),
and a selector byte (two hexadecimal characters).
The esi-address option requires that you enter 12
hexadecimal characters as the ESI. The ATM switch
provides the prefix and the voice selector byte provides
the remaining characters.
You can view the assigned address using the show atm
video-voice address command.
5Router(config-if)# pvc [name] vpi/vci ilmi Create an ATM permanent virtual circuit (PVC) for ILMI
management purposes and enter PVC configuration
mode.
The optional name is a unique label that can be up to 16
characters long. name identifies to the processor the
virtual path identifier-virtual channel identifier (VPI-VCI)
pair to use for a particular packet.
The ATM network VPI of this PVC is an 8-bit field in the
header of the ATM cell. The vpi value is unique only on a
single link, not throughout the ATM network, because it
has local significance only. The vpi value must match that
of the switch. Valid values are from 0 to 255, but the value
is usually 0 for ILMI communications. If not specified,
the vpi value is set to 0.
You cannot set both vpi and vci to 0; if one is 0, the other
cannot be 0.
For ILMI communications this value is typically 16. The
VCI is a 16-bit field in the header of the ATM cell. The
VCI value is unique only on a single link—not throughout
the ATM network—because it has local significance only.
To set up communication with the ILMI, enter a value of
ilmi for ATM adaptation layer encapsulation; the
associated vpi and vci values are ordinarily 0 and 16,
respectively.
Note Typically, the low values 0 to 31 are reserved for
specific traffic (for example, F4 OAM, SVC signaling,
ILMI, and so on) and you should not use them for other
PVCs.
6Router(config-if-atm-pvc)# pvc [name] vpi/vci qsaal See the explanations in Step 5 for the name, vpi, and vci
values.
To enable the signaling for setup and tear-down of SVCs,
specify the Q.SAAL (Signaling ATM Adaptation Layer)
encapsulation; the associated vpi and vci values are
ordinarily 0 and 5, respectively. You cannot create this
PVC on a subinterface.
7#Router(config-if-atm-pvc)# exit Exit PVC interface configuration mode.
Step Command Purpose

Verifying ATM Interface Configuration
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 9
Verifying ATM Interface Configuration
To verify ATM interface configuration, follow the steps below:
Step 1 Enter the privileged EXEC show atm vc command to see how SVCs and PVCs are set
up, as in the following example:
Router# show atm vc
VCD / Peak Avg/Min Burst
Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts
0 1 0 5 PVC SAAL UBR 0 UP
0 2 0 16 PVC ILMI UBR 0 UP
0 379 0 60 SVC SNAP UBR 0 UP
0 986 0 84 SVC SNAP UBR 0 UP
0 14 0 133 SVC VOICE VBR 64 16 10 UP
0 15 0 134 SVC VOICE VBR 64 16 10 UP
0 16 0 135 SVC VOICE VBR 64 16 10 UP
0 17 0 136 SVC VOICE VBR 64 16 10 UP
0 18 0 137 SVC VOICE VBR 64 16 10 UP
0 19 0 138 SVC VOICE VBR 64 16 10 UP
0 20 0 139 SVC VOICE VBR 64 16 10 UP
0 21 0 140 SVC VOICE VBR 64 16 10 UP
0 22 0 141 SVC VOICE VBR 64 16 10 UP
0 23 0 142 SVC VOICE VBR 64 16 10 UP
0 24 0 143 SVC VOICE VBR 64 16 10 UP
0 25 0 144 SVC VOICE VBR 64 16 10 UP
0 26 0 145 SVC VOICE VBR 64 16 10 UP
0 27 0 146 SVC VOICE VBR 64 16 10 UP
0 28 0 147 SVC VOICE VBR 64 16 10 UP
Step 2 Enter the show atm svc command with or without the VPI/VCI specified. The following
example shows information for a specific SVC:
Router# show atm svc 0/134
ATM0: VCD: 5, VPI: 0, VCI: 134
VBR, PeakRate: 64000
AAL5, etype: 0x0, Flags 0x440, VCmode: 0xE000
OAM frequency: 0 second(s), OAM retry frequency: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM Loopback status: OAM Disabled
OAM VC state: Not Managed
ILMI VC state: Not Managed
InARP DISABLED
8Router(config-if)# interface atm 0 [.subinterface-number
{multipoint | point-to-point}]
Optionally, you can create and configure a subinterface.
This is useful when you wish to configure an extra
parameter on the ATM interface. For example, you can
specify one IP address on the main interface, as shown in
Step 3; then you can configure a second IP address on a
subinterface.
subinterface-number is a value in the range from 1 to
4294967293.
Enter the multipoint keyword when your network is fully
meshed and you want to communicate with multiple
routers. The point-to-point keyword configures the
subinterface for communication with one router, as in a
hard-wired connection. There is no default for this
parameter.
Step Command Purpose

Verifying ATM Interface Configuration
10 Cisco IOS Release 12.0(7)T
InPkts: 4, OutPkts: 4, InBytes: 432, OutBytes: 432
InPRoc: 4, OutPRoc: 4, Broadcasts: 0
InFast: 0, OutFast: 0, InAS: 0, OutAS: 0
OAM cells received: 0
F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI:0
F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI:0
OAM cells sent: 0
F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0
OAM cell drops: 0
Status: UP
TTL: 3
interface = ATM0, call locally initiated, call reference = 5558610
vcnum = 5, vpi = 0, vci = 134, state = Active(U10), point-to-point call
Retry count: Current = 0
timer currently inactive, timer value = 00:00:00
Remote Atm Nsap address:47.00918100000000400B0A2501.0060837B4743.00,
VCowner:Static Map
Step 3 To see the PVCs that are set up for ILMI management and Q.SAAL signaling, enter the
show atm pvc command with the VPI/VCI specified, as in the following example:
Router# show atm pvc 0/5
ATM0: VCD: 2, VPI: 0, VCI: 5, Connection Name: SAAL
UBR, PeakRate: 56
AAL5-SAAL, etype:0x4, Flags: 0x26, VCmode: 0x0
OAM frequency: 0 second(s), OAM retry frequency: 1 second(s), OAM retry frequenc
y: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM Loopback status: OAM Disabled
OAM VC state: Not Managed
ILMI VC state: Not Managed
InARP DISABLED
InPkts: 2044, OutPkts: 2064, InBytes: 20412, OutBytes: 20580
InPRoc: 2044, OutPRoc: 2064, Broadcasts: 0
InFast: 0, OutFast: 0, InAS: 0, OutAS: 0
OAM cells received: 0
F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0
F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0
OAM cells sent: 0
F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0
F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0
OAM cell drops: 0
Compress: Disabled
Status: INACTIVE, State: NOT_IN_SERVICE
!
Router# show atm pvc 0/16
ATM0: VCD: 1, VPI: 0, VCI: 16, Connection Name: ILMI
UBR, PeakRate: 56
AAL5-ILMI, etype:0x0, Flags: 0x27, VCmode: 0x0
OAM frequency: 0 second(s), OAM retry frequency: 1 second(s), OAM retry frequenc
y: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM Loopback status: OAM Disabled
OAM VC state: Not Managed
ILMI VC state: Not Managed
InARP DISABLED
InPkts: 398, OutPkts: 421, InBytes: 30493, OutBytes: 27227
InPRoc: 398, OutPRoc: 421, Broadcasts: 0
InFast: 0, OutFast: 0, InAS: 0, OutAS: 0
OAM cells received: 0
F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0
F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0
OAM cells sent: 0
F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0
F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0

Verifying ATM Interface Configuration
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 11
OAM cell drops: 0
Compress: Disabled
Status: INACTIVE, State: NOT_IN_SERVICE
Step 4 To view information about the ATM interface, enter the privileged EXEC show atm
interface command and specify ATM 0, as in the following example:
Router# show interface atm 0
ATM0 is up, line protocol is up
Hardware is PQUICC Atom1
Internet address is 9.1.1.6/8
MTU 1500 bytes, sub MTU 1500, BW 1536 Kbit, DLY 20000 usec,
reliability 255/255, txload 22/255, rxload 11/255
NSAP address: 47.0091810000000002F26D4901.000011116666.06
Encapsulation ATM
292553397 packets input, -386762809 bytes
164906758 packets output, 1937663833 bytes
0 OAM cells input, 0 OAM cells output, loopback not set
Keepalive not supported
Encapsulation(s):, PVC mode
1024 maximum active VCs, 28 current VCCs
VC idle disconnect time: 300 seconds
Signalling vc = 1, vpi = 0, vci = 5
UNI Version = 4.0, Link Side = user
Last input 00:00:00, output 2d05h, output hang never
Last clearing of "show interface" counters never
Input queue: -1902/75/0 (size/max/drops); Total output drops: 205
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 67000 bits/sec, 273 packets/sec
5 minute output rate 136000 bits/sec, 548 packets/sec
76766014 packets input, 936995443 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
367264676 packets output, 3261882795 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
Step 5 Enter the privileged EXEC show atm video-voice address command to see information
about the ATM interface address, which is particularly helpful because the address is
assigned automatically with the atm voice aesa command. The following display also
confirms that the ILMI status is confirmed—the ILMI PVC is set up to allow SVC
management:
Router# show atm video-voice address
nsap address type ilmi status
47.0091810000000002F26D4901.00107B4832E1.FE VOICE_AAL5 Confirmed
47.0091810000000002F26D4901.00107B4832E1.C8 VIDEO_AAL1 Confirmed

Configuring Voice Ports and Voice Dial Peers
12 Cisco IOS Release 12.0(7)T
Configuring Voice Ports and Voice Dial Peers
In this section, the voice ports and voice dial peers are set up to support the local and the remote
parties.
Step Command Purpose
1Router# configure terminal Enter global configuration mode.
2Router(config)# voice-port port/slot Specify a voice port and enter voice-port configuration
mode.
port specifies the slot number on the Cisco MC3810. If
the analog voice module (AVM) or the digital voice
module (DVM) is installed, the slot number is 1. If the
multiflex trunk (MFT) is installed, the slot number is 0.
slot specifies the voice port number. The valid entries
depend on the hardware configuration, as follows:
• Analog: 1 to 6
• Digital T1: 1 to 24
• Digital E1: 1 to 15 and 17 to 31
3Router(config-voiceport) codec g726r32
or see Step 6.
(Fax only, Optional) If you are configuring a dial peer for
faxes over ATM SVCs, the default codec setting for the
voice port does not function properly with the typical fax
rate of 9.600 bps. Therefore, you can either change the
codec or change the fax rate. The codec must support a
minimum of 22 kbps.
To change the codec from the default g729ar8 codec
(8 kbps), enter the voice-port codec command to specify
one of the following compression modes:
•g726r32—Specifies G.726 32K ADCPM compression.
•g711alaw—Specifies G.711 64K PCM A-Law
compression.
•g711ulaw—Specifies G.711 64K PCM U-Law
compression.
4Router(config-voiceport) exit Exit voice-port configuration mode.
5Router(config)# dial-peer voice tag voatm Define a voice ATM dial peer for the remote system and
enter dial-peer configuration mode. Voice dial peers are
persistent and exist until they are specifically removed
with the no form of the dial-peer voice command.
The tag value identifies the dial peer and must be unique
on the Cisco MC3810. Do not duplicate a specific tag
number. Valid values are from 1 to 10000.
6Router(config-dialpeer)# fax rate 4800 (Fax only, Optional) If you are configuring a dial peer for
faxes over ATM SVCs, the default codec setting for the
voice port does not function properly unless the fax rate is
slowed from the typical speed of 9.600 bps. Therefore,
you can either change the codec (see Step 3) or change the
fax rate to 4,800 bps or 2,400 bps.

Verifying Voice Ports and Voice Dial Peers
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 13
Verifying Voice Ports and Voice Dial Peers
Step 1 To verify voice-port configuration, enter the privileged EXEC show voice port
command; you can either specify a voice port, or issue the command without arguments
to display information about all voice ports. The following text shows example output:
Router# show voice port 1/1
Voice-port1/1 Slot is 1, Port is 1
Type of VoicePort is E&M
Operation State is UP
Administrative State is UP
No Interface Down Failure
Description is not set
Noise Regeneration is enabled
Non Linear Processing is enabled
7Router(config-dialpeer)# destination-pattern string [T]Configure the dial peer's destination pattern to allow the
system to reconcile dialed digits with the peer’s NSAP
address. The string is a series of digits that specify the
E.164 or private dialing plan telephone number. Valid
entries are the digits 0 through 9 and the letters A through
D. The plus symbol (+) is not valid. You can enter the
following special characters:
• The star character (*) and the pound sign (#) that
appear on standard touch-tone dial pads can appear in
any dial string but not as leading characters (for
example, *650).
• The period (.) acts as a wildcard character.
• Use the comma (,) only in prefixes to insert a
one-second pause.
• Use the timer (T) character to configure variable-length
dial plans.
8Router(config-dialpeer)# session target ATM0 {svc nsap
address | pvc [vpi/vci | name]}
Configure the ATM session target for the dial peer.
Specify ATM 0 as the interface.
When you use SVCs, the system reconciles dialed digits
with the remote ATM interface’s voice NSAP address.
Note If you are using PVCs for voice, you can specify a
PVC defined on the ATM interface as a session target, by
using a name or a VPI/VCI combination. For additional
information, see Voice, Video, and Home Applications
Configuration Guide for Cisco IOS Release 12.0.
9Router(config-dialpeer)# exit Exit dial-peer configuration mode for this particular dial
peer.
10 Router(config)# dial-peer voice tag pots Define a local voice ATM dial peer.
The tag value identifies the dial peer and must be unique
on the Cisco MC3810. Do not duplicate a specific tag
number. Valid values are from 1 to 10000.
11 Router(config-dialpeer)# destination-pattern string Configure the dial peer's destination pattern. See Step 7
for more information.
12 Router(config-dialpeer)# port slot/port Specify the voice port where the voice equipment is
connected.
Step Command Purpose

Verifying Voice Ports and Voice Dial Peers
14 Cisco IOS Release 12.0(7)T
Music On Hold Threshold is Set to -38 dBm
In Gain is Set to 0 dB
Out Attenuation is Set to 0 dB
Echo Cancellation is enabled
Echo Cancel Coverage is set to 8 ms
Connection Mode is normal
Connection Number is not set
Initial Time Out is set to 10 s
Interdigit Time Out is set to 10 s
Call-Disconnect Time Out is set to 0 s
Coder Type is g729ar8
Companding Type is u-law
Voice Activity Detection is disabled
Ringing Time Out is 180 s
Wait Release Time Out is 30 s
Nominal Playout Delay is 80 milliseconds
Maximum Playout Delay is 160 milliseconds
Rx A bit no conditioning set
Rx B bit no conditioning set
Rx C bit no conditioning set
Rx D bit no conditioning set
Tx A bit no conditioning set
Tx B bit no conditioning set
Tx C bit no conditioning set
Tx D bit no conditioning set
Tx Busyout ABCD bits = 1010 Default pattern
Rx Seize ABCD bits = 1111 Default pattern
Rx Idle ABCD bits = 0000 Default pattern
Tx Seize ABCD bits = 1111 Default pattern
Tx Idle ABCD bits = 0000 Default pattern
Ignored Rx ABCD bits = BCD
Region Tone is set for US
Analog Info Follows:
Currently processing Voice
Maintenance Mode Set to None (not in mtc mode)
Number of signaling protocol errors are 0
Impedance is set to 600r Ohm
Voice card specific Info Follows:
Signal Type is immediate
Operation Type is 2-wire
E&M Type is 1
Dial Type is dtmf
In Seizure is active
Out Seizure is active
Digit Duration Timing is set to 100 ms
InterDigit Duration Timing is set to 100 ms
Pulse Rate Timing is set to 10 pulses/second
InterDigit Pulse Duration Timing is set to 500 ms
Clear Wait Duration Timing is set to 400 ms
Wink Wait Duration Timing is set to 200 ms
Wink Duration Timing is set to 200 ms
Delay Start Timing is set to 150 ms
Delay Duration Timing is set to 140 ms
Dial Pulse Min. Delay is set to 140 ms
Auto Cut-through is disabled
Percent Break of Pulse is 61 percent
Dialout Delay for immediate start is 300 ms

Verifying Voice Ports and Voice Dial Peers
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 15
Step 2 To verify voice dial-peer configuration, enter the privileged EXEC show dial-peer voice
command. The following text is sample output from the show dial-peer voice command:
Router# show dial-peer voice
VoiceEncapPeer1
tag = 1, destination-pattern = ‘4002’,preference = 0,
Admin state is up, Operation state is up
type = pots, prefix = ‘’, fwd-digits = 0,
session-target = ‘’, voice-port = 1/1
VoiceOverATMPeer2
tag = 2, destination-pattern = ‘4001’,preference = 0,
Admin state is up, Operation state is up
type = voatm, session-target = ’ATM0’
nsap ’47.0091810000000050E201B101.00107B09C6ED.FE’,
VoiceEncapPeer3
tag = 3, destination-pattern = ‘4003’,preference = 0,
Admin state is up, Operation state is up
type = pots, prefix = ‘’, fwd-digits = 0,
session-target = ‘’, voice-port = 1/1
Step 3 You can also enter a dial-plan number in order to learn more about a voice dial peer with
the show dialplan number dial string command, as shown in the following example:
router# show dialplan number 5558809
Macro Exp.: 3388809
VoiceEncapPeer9
information type = voice,
tag = 9, destination-pattern = ‘5558809’,
answer-address = ‘’, preference=0,
group = 9, Admin state is up, Operation state is up,
incoming called-number = ‘’, connections/maximum = 0/unlimited,
application associated:
type = pots, prefix = ‘’,
session-target = ‘’, voice-port = ‘1/9’,
direct-inward-dial = disabled,
register E.164 number with GK = TRUE
Connect Time = 0, Charged Units = 0,
Successful Calls = 0, Failed Calls = 0,
Accepted Calls = 0, Refused Calls = 0,
Last Disconnect Cause is "",
Last Disconnect Text is "",
Last Setup Time = 0.
Matched: 5558809 Digits: 7
Target:

Troubleshooting Voice over ATM SVCs
16 Cisco IOS Release 12.0(7)T
Troubleshooting Voice over ATM SVCs
When problems occur with voice over ATM SVCs, follow the steps below to look first for simpler
problems before progressing to more complex possible issues. For general information about
troubleshooting and voice QoS, see Cisco IOS Release 12.0 Voice, Video, and Home Applications
Configuration Guide. Please see if any additional steps should be mentioned here.
Step 1 Make sure that the ATM interface, serial ports, and controllers are set to no shutdown.
Step 2 On both Cisco MC3810 multiservice access concentrators, make sure that ILMI and
Q.SAAL PVCs are set up in order to allow SVC communications. The privileged EXEC
show atm pvc command displays information about configured PVCs, including the
ILMI and Q.SAAL PVCs.
Router# show atm pvc
VCD / Peak Avg/Min Burst
Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts
0 1 0 5 PVC SAAL UBR 56 UP
0 2 0 16 PVC ILMI UBR 56 UP
Step 3 Ensure that NSAP addresses are set up and confirmed as operational under the ATM
interfaces of the Cisco MC3810 multiservice access concentrators on both sides of the
communication. Enter the privileged EXEC show atm video-voice address or show atm
ilmi-status command, which are illustrated below. show atm ilmi-status provides more
details about the ILMI PVC than does show atm video-voice address:
router# show atm video-voice address
nsap address type ilmi status
47.0091810000000002F26D4901.00107B4832E1.FE VOICE_AAL5 Confirmed
router# show atm ilmi-status
Interface : ATM0 Interface Type : Private UNI (User-side)
ILMI VCC : (0, 16) ILMI Keepalive : Enabled (5 Sec 4 Retries)
ILMI State: UpAndNormal
Peer IP Addr: 10.1.1.11 Peer IF Name: ATM1/0/0
Peer MaxVPIbits: 8 Peer MaxVCIbits: 14
Active Prefix(s) :
47.0091.8100.0000.0002.f26d.4901
End-System Registered Address(s) :
47.0091.8100.0000.0002.f26d.4901.0000.1111.5555.05(Confirmed)
47.0091.8100.0000.0002.f26d.4901.0010.7b48.32e1.fe(Confirmed)
47.0091.8100.0000.0002.f26d.4901.0010.7b48.32e1.c8(Confirmed)
Step 4 Check the voice ports for busyout status by issuing the show voice busyout command. If
the busyout-monitor interface or busyout forced command has been issued, one or
more voice ports may be busied out, either due to a serial interface failure or because the
voice port has been forced into a busyout state.
router# show voice busyout
If following network interfaces are down, voice port will be put into busyout
state Serial0
The following voice ports are in busyout state 1/10
Enter show interfaces serial to check the specified serial interface, or enter show voice
port to check the voice-port status. The noform of the busyout forced command restores
the voice port.

Verifying Voice Ports and Voice Dial Peers
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 17
Step 5 Check for clocking problems. Enter the privileged EXEC command show controllers t1
or show controllers e1 command to check for slip errors, as shown in the following
excerpt from the command output:
.
.
.
Data in current interval (819 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Data in Interval 1:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Data in Interval 2:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Data in Interval 3:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
.
.
.
A few slip errors may not indicate a problem with clocking. However, if there are
numerous errors, especially incrementing numbers of errors, you should check the
following possibilities:
—The network clocks are not set to the same clock rate. Enter the show
network-clocks command on the devices to ensure that these clock rates match.
—The Cisco MC3810 multiservice access concentrators may not be using the same
clock source. For example, if there are two back-to-back Cisco MC3810
multiservice access concentrators and one is using an internal clock source, the
other must use the line clock source in order to obtain clocking from the same
device. Enter the privileged EXEC commands show network-clocks and show
controllers t1 or show controllers e1 to see the clock source settings. For
additional guidance, see Chapter 4, “Configuring Synchronized Clocking,” in
Cisco MC3810 Multiservice Access Concentrator Software Configuration Guide.
Step 6 Check the functionality of the Service-Specific Connection-Oriented Protocol (SSCOP).
Enter the privileged EXEC show sscop command. See the following excerpt from the
command output:
router# show sscop
SSCOP details for interface ATM0
Current State = Data Transfer Ready
Interpretation of the command output requires familiarity with SSCOP, so unless you
understand the protocol, just use the command to ensure that the protocol is in a state of
readiness, as shown above. If you need to make changes, see the Cisco IOS Release 12.0
documents, Wide-Area Networking Configuration Guide and Wide-Area Networking
Command Reference.
Note If you plan to adjust SSCOP parameters, you may wish to complete the rest of the
troubleshooting steps before taking this route.

Troubleshooting Voice over ATM SVCs
18 Cisco IOS Release 12.0(7)T
Step 7 Enter the show dial-peer voice command on the local and remote concentrators to verify
that each has been configured properly to communicate with the other, as shown in the
following example:
Router1# show dial-peer voice
VoiceEncapPeer33
tag = 1, destination-pattern = ‘5558810’,preference = 0,
Admin state is up, Operation state is up
type = pots, prefix = ‘’, fwd-digits = 0,
session-target = ‘’, voice-port = 1/1
VoiceOverATMPeer333
tag = 2, destination-pattern = ‘559...’,preference = 0,
Admin state is up, Operation state is up
type = voatm, session-target = ’ATM0’
nsap ’47.0091810000000002F26D4901.567856785678.56’,
Router2# show dial-peer voice
VoiceEncapPeer44
tag = 20, destination-pattern = ‘5559810’,preference = 0,
Admin state is up, Operation state is up
type = pots, prefix = ‘’, fwd-digits = 0,
session-target = ‘’, voice-port = 1/1
VoiceOverATMPeer444
tag = 10, destination-pattern = ‘5558...’,preference = 0,
Admin state is up, Operation state is up
type = voatm, session-target = ’ATM0’
nsap ’47.0091810000000002F26D4901.100110011001.01’,
Step 8 Enter the privileged EXEC show call history voice record command to see information
about current and recent voice calls, allowing analysis of possible problems:
router# show call history voice record
ConnectionId=[0x9CE20881 0x224855C1 0x0 0x1C9B84C7]
Media=TELE, TxDuration= 301962 ms
CallingNumber=6668808
SetupTime=47995411 x 10ms
ConnectTime=47995671 x 10ms
DisconectTime=48025867 x 10ms
DisconnectText=local onhook
ConnectionId=[0x9CE20881 0x224855C1 0x0 0x1C9B84C7]
Media=ATM, LowerIfName=ATM0, VPI=0, VCI=299
CalledNumber=5559808
SetupTime=47995483 x 10ms
ConnectTime=47995671 x 10ms
DisconectTime=48025867 x 10ms
DisconnectText=remote onhook
ConnectionId=[0x9CE20881 0x224855C2 0x0 0x1C9B84CB]
Media=TELE, TxDuration= 301950 ms
CallingNumber=5558803
SetupTime=47995412 x 10ms
ConnectTime=47995682 x 10ms
DisconectTime=48025877 x 10ms
DisconnectText=local onhook

Verifying Voice Ports and Voice Dial Peers
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 19
Monitoring and Maintaining Voice over ATM SVCs
Command Purpose
Router# show network-clocks Displays clock settings.
Router# show controllers t1/e1 Displays information about controller configuration and
errors.
Router# show interfaces serial Displays information about serial interface configuration
and shows whether serial ports are operational.
Router# show atm vc Displays information about all configured PVCs and
SVCs.
Router# show interface atm0 Displays information about ATM interface configuration.
Router# show controllers atm Displays ATM controller information, including queue,
memory, and buffer statistics.
Router# show atm video-voice address Displays NSAP addresses configured on the ATM
interface along with their status.
Router# show atm ilmi-status Displays detailed information about the ILMI PVC and
functions.
Router# show sscop Displays technical information about SSCOP status and
readiness.
Router# show voice busyout Displays information about voice ports that may be busied
out.
Router# show voice port Displays information about configured voice ports.
Router# show voice dial-peer Displays information about configured voice dial peers.
Router# show call history voice record Displays detailed information about calls in progress and
recent calls.

Configuration Examples
20 Cisco IOS Release 12.0(7)T
Configuration Examples
This example shows the configurations of two Cisco MC3810 multiservice access concentrators that
each have voice dial peers connecting over ATM SVCs. For additional information, see the Cisco
MC3810 Multiservice Access Concentrator Software Configuration Guide and the Cisco MC3810
Multiservice Access Concentrator Software Command Reference.
Figure 2 Sample Configuration: Two Cisco MC3810s using ATM SVCs for Voice
Initially, the network clocks are set up on MC3810A and MC3810B.
The following configuration sets the T1 0 controllers, which are for ATM service. ESF framing and
B8ZS are required for ATM. The default clock source is line, and the default for the T1 1 controller
automatically becomes internal.
The following configuration shows how the T1 1 controllers are set up for channel-associated
signaling (CAS) through the mode cas command. A voice group is created on each controller to
specify all of the DS0s for CAS and to set up E&M immediate-start signaling for the voice ports.
The following commands show how to configure the ATM interface and set up PVCs to supply
Q.SAAL signaling and ILMI management for SVC communications. Note that you can also specify
the voice NSAP address by using the atm voice aesa command with an ESI value.
hostname MC3810A
!
network-clock base-rate 64k
ip subnet-zero
ip wccp version 2
ip host keyer-ultra 223.255.254.254
!
appletalk routing
ipx routing 1111.0045.0005
hostname MC3810B
!
network-clock base-rate 64k
ip subnet-zero
ip wccp version 2
ip host keyer-ultra 223.255.254.254
!
appletalk routing
ipx routing 1111.0045.0002
controller T1 0
framing esf
linecode b8zs
mode atm
controller T1 0
framing esf
linecode b8zs
mode atm
controller T1 1
framing esf
clock source internal
linecode b8zs
mode cas
voice-group 1 timeslots 1-24 type
e&m-immediate-start
controller T1 1
framing esf
clock source internal
linecode b8zs
mode cas
voice-group 1 timeslots 1-24 type
e&m-immediate-start
interface ATM0
ip address 9.1.1.5 255.0.0.0
no ip directed-broadcast
no ip route-cache
atm pvc 1 0 5 qsaal
atm pvc 2 0 16 ilmi
atm ilmi-keepalive
atm voice aesa default
interface ATM0
ip address 9.1.1.6 255.0.0.0
no ip directed-broadcast
no ip route-cache
atm pvc 1 0 5 qsaal
atm pvc 2 0 16 ilmi
atm ilmi-keepalive
atm voice aesa default
C
isco MC3810 Cisco MC3810
22887
ATM