Platan Proxima User manual

IP PBX Server
PBX Server
USER MANUAL
rev. 2.12.01

If a more detailed description (supplement) can be found elsewhere in this
document, the following symbols are used:
 to be explained
 already explained
Note (a symbol put in the margin)
Proxima IP PBX Server, Proxima plus IP PBX Server,
Libra PBX Server, Libra STD PBX Server
as well as PLATAN ProximaWeb, LibraWeb and LibraPC
are products manufactured by:
PLATAN
®
sp. z o.o. sp.k. 81-855 Sopot, ul. Platanowa 2, Poland
tel. [phone], fax [phone]
e-mail: [e-mail], www.platan.eu
technical support and maintenance tel. [phone]
All rights reserved.
Sopot, July 20
th
, 2020

Table of Contents
1. Introduction ......................................................................................... 7
1.1. Server programming .................................................................................8
1.2. List of acoustic signals within the server ..................................................9
2. Access to the services offered by the server .................................... 11
3. Making calls....................................................................................... 12
3.1. Internal calls............................................................................................12
3.1.1 How to make an internal call .................................................................................. 12
3.2. External calls ..........................................................................................13
3.3. Video calls ..............................................................................................14
3.3.1 Internal video calls.................................................................................................. 14
3.3.2 External video calls................................................................................................. 14
3.4. Calls made by external port ....................................................................16
4. Services offered by the server .......................................................... 17
4.1. Services connected with incoming calls .................................................17
4.1.1 Analogue trunk lines............................................................................................... 17
4.1.2 Call queuing............................................................................................................ 18
4.1.3 ISDN trunk lines ..................................................................................................... 19
4.1.4 Automatic Call Distribution – ACD........................................................................ 19
4.1.5 Call transferring ...................................................................................................... 20
4.1.6 Return calls (consultations)..................................................................................... 21
4.1.7 Offering an external call to an engaged user ........................................................... 22
4.1.8 Transferring an external call to an engaged user ..................................................... 23
4.1.9 HOLD – external call hold...................................................................................... 23
4.1.10 Transferring a call to another trunk line.................................................................. 25
4.1.11 Return external call................................................................................................. 25
4.1.12 Call Through........................................................................................................... 27
4.1.13 Capturing and returning calls.................................................................................. 27
4.1.14 Capturing external calls .......................................................................................... 28
4.1.15 Unconditional call forwarding to another telephone - CFU (I'm there) ................... 28
4.1.16 Unconditional call forwarding to a selected extension – CFU (I'm here) ................ 29
4.1.17 Call forwarding when my number is busy (CFB).................................................... 30
4.1.18 Call forwarding when my telephone fails to answer (CFNA) ................................. 31
4.1.19 Call forwarding when my VoIP phone is not reachable (CFNR) ............................ 33
4.1.20 Logging into and out of the Hunt Group................................................................. 34
4.1.21 Boss-secretary scenario........................................................................................... 36
4.2. Services connected with outgoing calls ..................................................36
4.2.1 Limiting the duration of external calls .................................................................... 36
4.2.2 Direct access to emergency telephone numbers ...................................................... 36
4.2.3 External calls through selected trunk lines.............................................................. 37
4.2.4 Outgoing external calls with CLIR ......................................................................... 38
4.2.5 Least Cost Routing – LCR service.......................................................................... 38
4.2.6 Booking a trunk line call......................................................................................... 39
4.2.7 Booking a call to an engaged extension .................................................................. 40
4.2.8 Call booking through a secretary ............................................................................ 41
4.2.9 Group call – Hunt Groups....................................................................................... 41
4.2.10 Calling onto the proprietary phone speaker............................................................. 42
4.2.11 Redialling the last dialled external number ............................................................. 43

4.2.12 Booking a call to the last dialled external number .................................................. 43
4.2.13 Booking a call to any external number.................................................................... 44
4.2.14 Booking a call to any external number at a specific time........................................ 45
4.2.15 Speed dialling ......................................................................................................... 46
4.2.16 Virtual extensions ................................................................................................... 47
4.2.17 Blocking outgoing external calls from the phone.................................................... 49
4.2.18 Accessing the trunk line with bypassing the blockade ............................................ 50
4.2.19 Notes on the functionality of the virtual extensions ................................................ 51
4.2.20 Analogue FLASH on trunk lines............................................................................. 51
4.3. Conferences............................................................................................ 53
4.3.1 Conference rooms................................................................................................... 53
4.3.1.1 Types of conference rooms ........................................................ 53
4.3.1.2 Conference room reservation ..................................................... 55
4.3.1.3 Checking active reservations...................................................... 56
4.3.1.4 Deleting reservations.................................................................. 56
4.3.1.5 Entrance to the conference room................................................ 57
4.3.2 Internal conference for 8 extension users................................................................ 58
4.3.3 Conference calls with outside party ........................................................................ 59
4.3.4 Two outside parties – one extension user conference.............................................. 60
4.3.5 CIRCULAR conference.......................................................................................... 61
4.4. Additional server functions available from the telephone...................... 62
4.4.1 Wake-up call (reminder)......................................................................................... 62
4.4.2 Changing server operation modes manually ........................................................... 63
4.4.3 BABYSITTER function (remote room listening in) ............................................... 67
4.4.4 DO NOT DISTURB function ................................................................................. 67
4.4.5 MCID – Malicious Call Identification .................................................................... 68
4.4.6 External devices control (I/O)................................................................................. 69
4.4.7 Hotel features.......................................................................................................... 70
4.5. Server programming using the telephone............................................... 71
4.5.1 Access code for server programming using the telephone ...................................... 71
4.5.2 Setting up the server IP address using the telephone............................................... 71
4.5.3 Announcement recording........................................................................................ 72
4.5.4 Verification of announcements recorded by the user .............................................. 73
4.5.5 Date and time setting .............................................................................................. 74
4.5.6 Deleting active bookings......................................................................................... 75
4.5.7 Special service functions......................................................................................... 75
5. Proprietary phones............................................................................76
5.1 Digital proprietary phones...................................................................... 76
5.1.1 Messages on the digital proprietary phone display.................................................. 81
5.1.2 Phonebook in digital proprietary phones................................................................. 84
5.1.3 Programming buttons and LEDs in the digital proprietary phone ........................... 87
5.1.4 Direct Station Selection (DSS) console – key functions (Libra PBX Server only).. 88
5.1.5 Messages on the digital proprietary phone display.................................................. 89
5.1.6 Programming buttons and LEDs using the telephone ............................................. 91
6. Doorphones for the Proxima and Libra servers.............................94
7. Voicemail............................................................................................95
7.1. Using voicemail ..................................................................................... 95
7.1.1 Voicemail initiation ................................................................................................ 95
7.1.2 Forwarding calls to a voicemail inbox .................................................................... 95
7.1.3 Calling a voicemail inbox ....................................................................................... 96
7.1.4 Information about new messages ............................................................................ 97

7.1.5 Direct access to a voicemail box............................................................................. 98
7.1.6 Voicemail connection (main menu level)................................................................ 99
7.1.7 Listening to voicemail messages........................................................................... 100
7.1.8 Listening to voicemail messages – profiles........................................................... 102
7.1.9 Displaying date, time and caller's number............................................................. 102
7.1.10 Returning calls...................................................................................................... 102
7.2 Voicemail menu....................................................................................103
7.2.1 MENU: While listening to messages .................................................................... 103
7.2.2 MENU: Personal settings...................................................................................... 104
8. Acoustic signals................................................................................ 106
9. User Zone ......................................................................................... 107
9.1 User Zone – Configuration ...................................................................108
9.2 User Zone – Call history.......................................................................108
9.3 User Zone – Global phonebook ............................................................109
9.4 User Zone – Help..................................................................................110
10. Platan Hotel software...................................................................... 111
11. Short list of server functions .......................................................... 112
12. Glossary............................................................................................ 116

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Note: all functions described in the present manual concern default settings of
the numbering plan. In the case of the numbering plan settings change, the current
function codes can be found online in the User Zone or obtained from the
Proxima IP PBX Server or Libra PBX Server installer.

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1. Introduction
We are pleased that you have chosen a telecommunications server offered by our
company. The Proxima IP PBX Server, Proxima plus IP PBX Server and Libra
PBX Server are the PLATAN's latest product line and are a state of the art IP
telecommunications systems. They are characterised by their high quality, a wide
range of functions and services, and easy operation. We hope you will be perfectly
satisfied with your purchase and we are always willing to provide professional
assistance and information about our products.
Proxima/Proxima plus IP PBX Server and Libra PBX Server’s key features:
•Embedded VoIP – IP Gateway, IP EXT, T.38 support.
•ProximaWeb, LibraWeb – web-based server management.
•Settings and call history accessible in User Zone via a web browser.
•Advanced VoIP diagnostics.
•Call recording ensuring security and higher quality of provided services.
•Multi Phone – up to 4 devices (including mobile phone) to one extension.
•See Who’s Talking – video calls accessible to any number of users.
•Networking of up to 16 Proxima and Libra PBX servers.
•Global phone book with up to 3 000 entries for proprietary and IP phones.
•Conference calls, conference rooms.
•Intelligent Call Distribution (ICD) consisting in:
oInteractive Voice Response (IVR) with multilevel call menu
scenarios.
oDistributing calls to user groups according to the preset criteria:
queuing, uniform (UCD), according to the topic selected via IVR,
automatically – based on the CLIP number (ACD).
o99 voice announcements (up to 30 h) for DISA and IVR.
•Embedded Voicemail (25 channels).
•4 melodies for waiting connections.
•ARS/LCR – automatic least cost routing.
•CLIP (Calling Line Identity Presentation) on all extensions.
•Call registration and billing – 100 000 billing buffer.
•Automatic fax signal recognition.
•Controlling external devices – automatically or from mobile phone.
•Platan Hotel embedded hotel software and hotel interface – support of
external hotel software.
•Open PCTI protocol enabling the server integration with Call center,
CRM systems and other applications and devices.
•VEK (VoIP Cost Eliminator).
•Call Through (transit connection with automatic authorisation).

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In order to operate the server properly, please read this manual carefully and keep
it for future reference. The Proxima/Proxima plus IP PBX Server and LIBRA PBX
Server manuals are organised as follows:
Part 1 – Proxima or Libra server operation and maintenance manual covering the
following issues:
important features of the server;
structure and installation procedure of the server.
Part 2 – joint user manual covering the following issues:
functions and services provided by the server, divided into incoming
and outgoing calls;
programming some server functions using the telephone;
operating proprietary phones, consoles and door phones;
built-in voicemail;
The majority of server functions are listed at the end of this manual in a
shortened version.
Part 3 – ProximaWeb/LibraWeb program operation manual covering the issues
concerning the program operation and the server programming using a
PC.
The server is accompanied with a hard copy of a Quick Start manual. User manual
of Proxima/Proxima plus IP PBX Server and Libra PBX Server can be found on
our website (Files tab):
http://www.platan.eu/offer/ip-pbx-telephone-systems/libra.html
http://www.platan.eu/offer/ip-pbx-telephone-systems/proxima.html
http://www.platan.eu/offer/ip-pbx-telephone-systems/proxima-plus.html
The server may be programmed by an authorised person only.
We also invite you to visit our website www.platan.eu, where information on new
products and changes can be found.
1.1. Server programming
The server can be set up only by an authorised person using the ProximaWeb,
LibraWeb or the LibraPC program.
Operation guidelines and the description of the server programming can be found
in the ProximaWeb and LibraWeb Program Operation Manual provided as part of
the server documentation.
Some of the server functions may be programmed using the telephone via
a dedicated Programming mode.

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1.2. List of acoustic signals within the server
The following acoustic signals are possible when using the server:
The server information tones that can be heard in the receiver when using the
PROXIMA/LIBRA server are as follows:
oserver dialling tone – a continuous tone heard after picking up the
receiver, indicating that the server is ready to be used;
osecond server dialling tone (a double beep before the continuous
sound) – indicates that the call forwarding and the “do not disturb”
functions are active;
oengaged tone – a periodic intermittent tone indicating that a line or a
party that we are calling is engaged;
o“unavailable” tone – a periodic intermittent tone indicating that it is
not possible to make a given call, e.g. because the granted privileges
have been exceeded;
oconfirmation (continuation) tone – a periodic intermittent tone
indicating that the booking has been accepted;
otransfer mode tone – one of the melodies or announcements chosen
by the user in the computer program;
oring-back tone – a periodic intermittent tone in sync with the ringing
tone rhythm heard by the party you are calling;

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Server call ringtones – phone ringing tones. The ringtone depends on the call
type. Rhythms of ringtones are set up in the program (menu: Common settings
→ Rhythms → Analogue phones) . Default (factory) ringtone settings are
presented below:
oExtension call ringtone – a periodic intermittent tone informing you
about an incoming internal call:
•0.25 d / 0.25 p / 0.75 d / 3.75 p
oExternal call ringtone – a periodic intermittent tone informing you
about an incoming external call:
•1 d / 4 p
oAlarm call ringtone – a periodic itermittent tone informing you about
an alarm (or a wake-up call):
• 0.25 d / 0.25 p
oGroup call ringtone – a periodic intermittent tone informing you
about a Hunt Group call:
•0.5 d / 0.5 p
oDISA call ringtone – a periodic intermittent tone informing you about
an external call incoming in a DISA mode:
•0.75 d / 0.25 p / 0.25 d / 3.75 p
oDoorphone call ringtone – a periodic intermittent tone informing you
about an incoming call from a door phone:
•0.25 d / 0.25 p / 0.25 d / 0.25 p / 0.5 d
/ 0.25 p / 0.5 d / 0.25 p
oVoicemail call ringtone:
• 0.25 d / 0.75 p
where 0.25 d – stands for 0.25-second ringtone
0.5 p – stands for 0.5-second pause
Different call ringtones can be defined in the program for proprietary
phones.
DECT, ISDN and analogue phones with pre-installed tunes may not support
the ringtones described above.

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2. Access to the services offered by the server
A function access symbol has been introduced in the server. This symbol should
be pressed before the combination of digits responsible for a specific server
function. After the function access symbol has been entered, the numeration range
is expanded and the conflict between the server function codes and its numeration
plan is solved. The user may choose between using a function access symbol and
working in a standard service access mode. The function access symbol is set by
default to “*.”
Types of access to functions:
standard – access to the server functions is gained by entering the combination
of digits to which certain functions are assigned;
after entering # – #must be entered before the combination of digits;
after entering * – *must be entered before the combination;
The above settings do not apply to the functions carried out after pressing the
Flash button, such as for example: transferring internal and incoming external
calls, hold function, etc. Dialling emergency, extension and external numbers
(with the “0” prefix) requires no special symbol as well.
The type of access to the server functions from the phone is defined in the program
(menu: Common settings → Global settings).
Conferences require a special symbol to be used after pressing the FLASH
button, e.g. Flash *7 “TEL.”
The symbol for exiting the Hotline function is defined in the computer
program (menu: Common settings → Global settings). If the symbol for
exiting the Hotline function is the same as the access symbol to the server
functions, the exiting symbol must be entered twice in order for the
function to work.

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3. Making calls
3.1. Internal calls
Internal calls are calls between the extensions (users) connected to the Proxima /
Libra server. Users are assigned (by means of the computer program) to Hunt
Groups (max. 16 groups). It is also defined to which Hunt Groups they may make
internal calls (menu Extensions → Traffic classes, assigned in extension
privileges). Calls to the door phone are also internal calls. Regardless of the above,
extensions may be assigned to Hunt Groups.
3.1.1 How to make an internal call
Pick up the phone.
You will hear a dialling tone.
Dial an extension or a Hunt Group number.
The extension numbers range is set by the installer. The numbers may
consist of 1-16 digits.
When the access to the server functions is set without any special signs (* or #),
function access codes and emergency numbers should be excluded from the
numbering plan.
A ring-back tone means that a connection will be established after the called party
answers.
If you hear an engaged tone, try again after a while or book a call (Booking a call
to an engaged extension).
An offering tone (in the form of quiet beeping) heard (in the background) during a
call means that an external call (or a Hunt Group call) is waiting to be answered.
After the conversation has ended and the phone has been hung up or after the call
has been put on hold (HOLD) and the phone has been hung up, a ringing tone will
be heard, indicating that the server is putting you through to the waiting extension
user.

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3.2. External calls
External calls – calls between extension users (server users) and outside parties.
Outgoing calls may be made by authorised users only (privileges of each server
user are granted by the server installer or by the service technician in the computer
program).
The basic method of accessing trunk lines is to press 0. Using the computer
program, the installer determines the trunk lines which will be available to a given
user after pressing 0. In addition, the installer may make the following trunk lines
available: *81, *82, *83, *84 and *80a*b*c#, where: a – unit number, b – slot
number, c – port number on the server card, while *is a function access symbol.
If you want to make an external call:
Pick up the phone.
You will hear a dialling tone.
Dial
You will hear: 
local exchange (LE) dialling tone
engaged tone if the trunk lines connected to the server are engaged
“unavailable” tone if your phone is not privileged to make outgoing calls
or if its trunk line is blocked with an individual code.
Dial an external number.
You will hear a ring-back tone from the local exchange. The tone type
depends on the status of the outside party – idle, engaged or unavailable.
If an external number is engaged, a call to this external number may be booked
(Booking of a call to an external number – functions: *92, *94, *95).
It is not possible to programme direct access to a trunk line using the telephone
(i.e. without dialling “0”), but it is possible to do so from the computer program
level – the so-called Hotline.
Hotline is not available from VoIP phones.

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3.3. Video calls
Video calls – these are calls made within the Proxima IP PBX Server or Libra PBX
Server with the use of VoIP technology. The video calls are available for:
Libra users equipped with Platan Video Softphone app. with audio/video
accessories
Yealink VP-530 IP video phones users
Helios IP video door phones users.
Video calls may be made as internal (extension-to-extension) calls between users
equipped with the above mentioned devices or between an internal user and an
external user equipped with IP video phone or Platan Video Softphone app., when
the call is made through a VoIP trunk line with a video calls support enabled.
Video call is made bypass media, meaning that the video stream is sent
outside the Proxima / Libra server. Possibility of making a call and its
quality depends on the used devices, LAN/WAN network quality and
bitrate. Single video call requires the bitrate from 64kb/s up to 4Mb/s in
both directions (download/upload).
3.3.1 Internal video calls
Dial an extension number or a Hunt Group number. The extension
numbers range is set by the installer. The numbers may consist of 1-16
digits.
Select Video option on an IP video phone or in Platan Video Softphone
app. and pick up the video phone receiver (or press the green receiver +
camera button in the Platan Video Softphone app.).
3.3.2 External video calls
Outgoing video calls can be made only by privileged users (privileges for every
server user are given by the installer or by the server maintenance personnel in the
computer program).
The main access to the trunk lines (escape code) is achieved by dialling ‘0’.
Installer defines in the computer programme which trunk lines will be available for
users after dialling ‘0’. Additionally, the following dial numbers can be allowed by

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the installer to access trunk lines through different trunk lines bunches: *81, *82,
*83, *84 and *80a*b*c#, where: a – unit number, b – slot number, c – server card
port number, and * - function access symbol.
If you want to make an external video call:
Dial and then dial the external number.
Select Video option on an IP video phone or in Platan Video Softphone
app. and pick up the video phone receiver (or press the green receiver +
camera button in the Platan Video Softphone app.).

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3.4. Calls made by external port
External port is a special type of equipment in Proxima and Libra PBX servers,
that is available after buying an appropriate licence.
A user with external port and mobile phone or any other external number can
become a PBX extension user with full access to the functions and services
according to the assigned privileges.
Extensions set in the PBX server as External port – in order to make these kinds of
calls or to use the server funcions or services – have to make a call on an PBX
external phone number provided by the system administrator. After having
established a connection they’ll hear a server’s continuous dialling tone. Then they
can dial a phone number they want to make a call to or a function/service code
according to the traffic and service class assigned to this extension.
Functions requiring the use of Flash are activated during a call after dialling a
symbol set as Flash by the administrator when configuring the port.

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4. Services offered by the server
4.1. Services connected with incoming calls
4.1.1 Analogue trunk lines
The server may operate in three different modes of handling incoming calls from
analogue trunk lines (CO). The installer must properly set up the modes described
below as call schemes using the computer program.
None MODE (no message)
A server operating in the None mode establishes an incoming call from a trunk line
with the defined Hunt Group (from 1 to 16 extensions).
If an outside party is calling a user of the server working in the None mode, the
procedure is as follows:
A server external number is dialled.
A server ring-back tone is heard (idle or engaged).
The server establishes a call with the extensions defined for this mode.
Announcement MODE
In the Announcement mode, the server plays the welcome voice message or the
tune while establishing a call with the defined Hunt Group.
If an outside party is calling a server user working in the Announcement mode,
the procedure is as follows:
A server external number is dialled.
A tune or a welcome message is heard,
e.g. “This is .... Please wait for the operator to answer...”
While playing the tune, the server establishes a call with extensions in the
order determined in the Hunt Group.

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MODES: DISA and IVR
In the DISA mode (Direct Inward System Access), having dialled the number, an
external caller hears an announcement in the course of which they can tone-dial the
server extension number. The time devoted to dial an extension number is definite
and set in the computer program (for in Call schemes). The IVR (Interactive Voice
Response) mode is an extended DISA mode.
In order to use the DISA or IVR function, an outside caller must use a phone with
tone dialling (DTMF).
If an outside party is calling a server extension working in the DISA mode, the
procedure is as follows:
A server external number is dialled.
A welcome announcement is heard,
e.g. “This is .... Please tone-dial the extension number”
An extension number or a different number (as stated in the
announcement) is dialled.
The server establishes a call with the selected extension or Hunt Group.
After the DISA time has lapsed and the outside party has not dialled any extension
number, the server follows the scenario defined in the computer program.
4.1.2 Call queuing
Call queuing makes it possible to handle the calls directed to the Hunt Groups,
which, due to the Hunt Group members being busy with other ongoing calls,
cannot be answered at once.
Call queuing makes it possible to handle up to 40 excessive calls directed to the
Hunt Group through a call scheme. Queued callers may hear the information about
their position in queue and estimated waiting time.
Additionally, the selected numbers may be tagged as VIP, thus having a priority in
queue when Hunt Group members are busy.
Queue and VIP settings are made in Proxima/Libra computer programme.

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4.1.3 ISDN trunk lines
MODES: None, Announcement, DISA, IVR
The server working in those modes supports digital trunk lines in a manner similar
to that employed in the case of analogue trunk lines. The digital ISDN BRA trunk
line may handle two calls at the same time (this is due to the distribution of ISDN-
BRA access into two B channels, both of which may be separately used as a traffic
channel). By the same token, the ISDN-PRA (30B+D) line may handle up to 30
calls at the same time.
Using the DDI (Direct Dial-In) service:
The server makes direct dialling of the extension number possible for the outside
party. In order to use this function, the following conditions must be met:
the server is connected with the telecom operator via the ISDN line;
the user has a group of DDI numbers assigned by the local
telecommunications operator;
Using the computer program, the server installer should programme the server to
handle DDI numbers (menu: Call distribution →MSN/DDI incoming calls).
If an outside party wishes to call a server user using the DDI function, the
procedure is as follows:
Dial the DDI external number of an extension, e.g. 585558888.
The outside party will hear a ring-back tone – if the selected extension is
idle (it may also be engaged – in such a case, the extension user hears a
tone offering an external call in the background).
The outside party will hear an engaged tone – if the selected extension is
engaged and it has the “no waiting call indication” function on.
The outside party will hear an "unavailable" tone – if the DDI traffic setup
within the server is incorrect or if there is no such number.
4.1.4 Automatic Call Distribution – ACD
The server offers the ACD (Automatic Call Distribution) function based on the
identified CLIP (Calling Line Identification Presentation) number. Using this
function, the server will route incoming calls, e.g. to selected extension users,
based on the ACD tables.
Full configuration of the ACD tables is carried out in the computer program

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(menu: Call distribution →ACD tables).
The ACD tables may contain the following data:
Full external number and information on the handling method, i.e.
whether it should be routed to a specific extension or to a Hunt Group, or
whether it should be handled in accordance with the pattern defined for a
selected trunk line.
Initial part of an external number (Prefix) – in such a case, external
numbers (within the incoming traffic) starting with the defined prefix will
be distributed by the server as specified in the ACD table.
Using the Automatic Call Distribution from analogue trunk lines (CO) requires
CLIP phones to be used and the CLIP function to be offered by the
telecommunications operator.
More information can be found in the Part 3. ProximaWeb / LibraWeb program
operation manual.
4.1.5 Call transferring
During a call – if a caller wishes to talk to another person, the call may be
transferred without being ended.
If you wish to transfer a call to another extension:
TRANSFERRING WITH OFFERING
Do not hang up the phone! Press or a symbol set as FLASH to
the IP phone or external port equipment.
You will hear a continuation tone.
Dial the number of the user to whom you want to transfer the call. This
can be either an extension or an external number. The caller hears a
tune, an announcement or a ring-back tone (depending on the Analogue
trunk lines configuration), or a tone set in the computer program (Common settings
→ Calls → Internal calls).
Wait for the called party to answer and provide them with the information
about the call.
Hang up the phone.
The offered call has been taken over by another person.