ATCOM A20 User manual

A20/A21/A20W/A21W
IP
Phone
User
Manual
Version: 2.0
2015-12-21

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
1. Overview of A20/A21/A20W/A21W
A20/A21/A20W/A21W
Type
POE
Power adapter
Wi-Fi
A20
No
Necessary
No
A21
Yes
Optional accessory
No
A20W
No
Necessary
Yes
A21W
Yes
Optional accessory
Yes
1.1 Interfaces
➢Power input: DC 5V, 1000mA or POE
➢LAN: RJ45 port
➢PC: RJ45 port
➢Headset jack 1 : RJ9 port
➢Handset jack 1 : RJ9 port
1.2 Hardware
➢LCD: 132×58
➢CPU: 400MHz Dual Core

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
➢LED indicator: 1 Status Light, 2 line indicators
1.3 Software
➢Sip 2.0 (RFC3261) and other related SIP RFCs
➢2 SIP lines
➢STUN
➢Jitter Buffer, VAD,CNG
➢G711A/u, G722, G726-16, G726-24, G726-32, G726-40, G729 , Lin16-16, iLBC
➢Echo Cancellation
➢SIP Domain name, Authentication
➢DTMF（inband, RFC2833, info）
➢Call transfer, Call forward, 3-way conference, Call hold, Call back
➢DND(Do Not Disturb), Auto answer, Blacklists, Block Call-ID, Block Anonymous call, Dial
plan, IP call
➢Phone book with 1000 white records and 100 black records, 200 answered calls, 200 missed
calls, 200 dialed calls
➢Update via HTTP, FTP, TFTP, PNP,HTTPS
➢Syslog
➢SNTP
➢WEB access with different login level
➢Multi-language: English, Chinese, Farsi, French, German, Hebrew, Italian, Portuguese,
Russian, Spanish, Turkish
➢Soft button: soft button * 3
➢Redundancy SIP server
➢BLF
1.4 Network
➢LAN/PC：Support bridge mode
➢Support VLAN（LAN VLAN and PC VLAN）
➢Support L2TP VPN
➢LAN support Primary and Secondary DNS
➢LAN support DHCP Client
➢Support QoS
1.5 Management and Maintenance
➢Support safe mode and firmware updating under safe mode
➢Support different level user management
➢Configuration via web , keyboard
➢Support multi-language
➢Auto provision (Firmware and configuration file)
➢Support system log and call log
1.6 Protocol
➢IEEE 802.3 /802.3 u 10 Base T / 100Base TX
➢DHCP: Dynamic Host Configuration Protocol
➢SIP RFC3261, RFC3262, RFC3263, RFC3264, RFC3265, RFC2543, RFC3489, RFC3842,
RFC3515, RFC2976, RFC3428, RFC2327, RFC2782, RFC1889
➢TCP/IP: Transfer Control Protocol/Internet Protocol
➢RTP: Real-time Transport Protocol
➢RTCP:RTP Control Protocol
➢DNS: Domain Name Server
➢TFTP: Trivial File Transfer Protocol
➢HTTP:Hypertext Transfer Protocol

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
➢FTP:File Transfer Protocol
1.7 Compliant and Authenticated Standard
➢CE: AGC01180140201E2，AGC01180140202E2
➢Comply with ROHS in EU
➢Comply with ROHS in China
➢
➢Operation temperature: lower than 60° C
➢Storage temperature: lower than 60° C
➢Humidity: 10 to 90% no dew
1.8 Packing List
Model
Phone
Handset
Handset
line
Stand
bracket
Ethernet
Cable
User Manual
CD
A20/A21/A2
0W/A21W
1
1
1
1
1pcs
1.5m
1
Note: Power adapter (Input: AC 100~240V, 50/60Hz; Output: 5V, 1000mA;)
1.9 Installation
Connect LAN port to PC with Ethernet cable, or connect A20/A21/A20W/A21W to a switch/router
which is in the same network as your PC. It uses DHCP mode by default, and you can review its
current IP address by pressing key on idle state. To access the web interface, you can input the
IP address in IE browser. E.G. The IP address of your A20/A21/A20W/A21W is 192.168.1.100, you
can input 192.168.1.100 and press enter key on your browser to access its webpage. There are two
login level:
User
Admin

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
Installation instruction
1. Desktop installation
A. Put the bottom side of the IP phone upside and press one-side joints of stand bracket into the slot,
please refer the picture as below:

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
B. Press the other side joints into the slot according to the direction of the arrow
C. It is the right picture after fixing the stand bracket below:
D. Disassemble the stand bracket:
Push the spring joint of stand and pull the stand according to the direction of the arrow. When the
joints are pulled out of the slot, you can take off the stand bracket.

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
10
10
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
10
10
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
2. Wall-hung Installation
A. Put the bottom side of the IP phone upside and press one-side joints of wall-hung stand bracket
into the slot, please refer the picture as below:

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
11
11
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
11
11
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
B. Press the other side joints into the slot according to the direction of the arrow
C. After install the wall-hung stand bracket, press one-side joints of stand bracket into the slot,
please refer the picture as below:

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
12
12
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
12
12
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
13
13
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
13
13
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
D. Press the other side joints into the slot according to the direction of the arrow
E. Knock in nails or screws on the wall according to the proportion of the distance between the
hanging holes as below:

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
14
14
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
14
14
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
F. It is the right picture after fixing the stand bracket below:
G. Disassemble the stand bracket:
Push the spring joint of stand and pull the stand according to the direction of the arrow. According to
the direction of the arrow:

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
15
15
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
15
15
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
2. Keypad of IP Phone
LCD Status Indicator LED
Line
key
Navigation
Menu
OK
Cancel
Soft Key
Volume
Voice Mail
Mute
Dial pad
Headset
Redial
Speaker

16
16
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
16
16
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
2.1 Describe of the buttons and Screen
Soft Keys
Press to select a function which displayed at the soft key zone
of screen
Display all optional functions at the last line of LCD screen.
Status Indicator
LED
Indicates the phone’s status,
➢If the phone is being started ,the LED is on
➢If the phone is standby, the LED is off
➢If there is income calling, the LED will blink at 120ms on,
120ms off.
➢If there is a new message, the LED will blink at 600ms on,
600ms off.
LCD Screen
All information such as date, time, phone number, incoming
caller’s ID(if available),line/call status, extension numbers and
the soft key features are displayed on it.
Line Key
Shows extension number and status.
Dial pad
Entering numbers or characters.
Navigation keys
Allows users to navigate (left, right, up, down). Press can
enter “Directory”. Press can enter “History”.
Adjust the volume (speaker/handset/headset/ring). Volume
level will be displayed on LCD when pressing volume key.
Confirm users’ operation and show status when
A20/A21/A20W/A21W is idle.
Cancel users’operation.
Enter menu settings.
Pick up and hung up under the speaker mode.
Mute the mic in a conversation by pressing the Mute button;
this prevents the person on the active call from hearing what
you or someone else in the room is saying.
To un-mute, press the Mute button again.
Pick up and hung up under headset mode.
Check the Voicemail status.

17
17
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
17
17
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
Redial the last dialed number

18
18
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
18
18
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
2.2 Line keys LED
LED Status
Description
Off
The line is idle or disabled for register
Blink quickly in green
The line has incoming call
Green
The line is talking
Blink quickly in red
The line is held
2.3 Status Indicator
LED Status
Description
On
A20/A21/A20W/A21W is being started
Off
A20/A21/A20W/A21W is standby
Blink in red at 120ms on, 120ms off
There is incoming call
2.4 Programmable keys LED
LED Status
Description
Off
The monitored account is unregistered
Green
The monitored account is idle
Red
The monitored account is talking
Fast blink in red
The monitored account is ringing
When powering on, all LEDs will be lighted once.
When there is an incoming call, the corresponding line LED and status LED will be blinking.
2.3 Describe of the LCD Screen Icons
Icon
Description
The extension is registered
The extension is unregistered
There is a new voice mail
There is an incoming call
The call is held
A20/A21/A20W/A21W is in speaker
mode
A20/A21/A20W/A21W is in handset
mode
A20/A21/A20W/A21W is in headset
mode
The call is muted

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
18
18
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
18
18
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
3. Basic functions and operations
3.1 Answer the calls
When there is an incoming call, phone will remind user with ringing. There are 3 ways to answer the
call
A. Answer by handset
Pick up the handset and talk with the caller. If you want to hang up, just put back the handset. When
you are talking with the handset and want to switch to speaker mode or headset mode, please press
key or key, then put down the handset.
B. Answer by speaker
Press key and talk with callers by built-in Micro-phone and Speaker. If you want to hang
up, please press key again. Switch calling or talking into handset mode by lifting the
handset under speaker mode. Press key will switch calling or talking into headset mode.
C. Answer by headset
Keep your microphone connected with the RJ9 headset jack, when there is an incoming call, press
key and talk with the caller. If you want to hang up, please press key again.
Pressing key can change calling or talking into speaker mode, and lifting the handset
switches to handset mode.
3.2 Make Call
A. Use the handset
Pickup the handset and input a phone number. Press soft key "Send" to dial the number. When you
hear the tones of “du~~du~~” and the phone number your dialed is being displayed on the LCD, the
phone at the side of being called should be ringing. If the called party answers this calling, the call is
established and the calling timer is started immediately.
B. Use the speaker
Press key and input a phone number. Press soft key "Send" to dial the number. When
caller hear the tones of “du~~du~~”and the phone number your dialed is being displayed on the
LCD, the phone at the side of being called should be ringing. If the called party answers this calling,
the call is established and the calling timer is started immediately.
C. Use the headset
Press Key and input a phone number. Press soft key "Send" to dial the number. When
caller hear the tones of “du~~du~~”and the phone number your dialed is being displayed on the

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
19
19
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
19
19
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
LCD, the phone at the side of being called should be ringing. If the called party answers this calling,
the call is established and the calling timer is started immediately.
D. Dial from phone book
1. Press key and input the keypad password 123 to enter the menu and choose “Directory”
option. Press "Select" soft key and then find the contact person by navigation keys. When the
certain contact person is highlighted, press "Dial" or just pick up the handset to call this number.
2. Pick up the handset, press "Directory" soft key, then select the contact person and press "Dial"
soft key.
3. Pick up the handset, press and enter “Directory”, then select the contact person and press
“Dial”soft key.
E. Dial from call history
1. Press key and input the keypad password 123 to enter the menu and choose “History”
option, then enter sub-directory “Dialed Calls”, “Received Calls”or ”Missed Calls”to select one
of call history entry, and press "Dial" soft key or pick up handset to call this number.
2. Pickup the handset, press "History”soft key, then select one of call history entry, and press
"Dial" soft key to call this number.
3. Pickup the handset, press and enter “Call History”,then select one of call history entry, and
press "Dial" soft key to call this number.
3.3 Pre- dial
It’s a method to dial a phone number immediacy at standby mode.
A、Dial-up the phone number at standby mode
B、Press soft key "Dial" to send out the number
Multiple line dial-up
A20/A21/A20W/A21W supports 2 SIP lines. That means user can register on2 different sip accounts
simultaneity. User is able to choose line1 or line2 by pressing corresponding line key. Line1 is the
priority line.
A20/A21/A20W/A21W maximum supports 4 concurrent calls. When there is an incoming call to
another line, LCD will show the incoming telephone number and line LED will be blinking in green.
User is able to press the corresponding line key on which you’re talking then press “Answer” to
receive the incoming call from another line.
3.4 Hang up the phone
1. Handset hang up
Put back the handset at handset mode, the current calling will be hung up.
2. Speaker hang up

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
20
20
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
20
20
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
Press key at speaker model, the current calling will be hung up.

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
20
20
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
20
20
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
3. Headset Hang up
Press key at headset model, the current calling will be hung up.
4. Hang up one line call
Press the hook to hang up the current calling when 2 calls happened simultaneously.
3.5 Call Transfer
1. Attended call transfer
The attended transfer allows user to call a third-party before transferring the calling.
While on calling, press the "Transfer" soft key to hold the current call and phone the third party. Then
dial the target number you want to transfer to on the activated line and press “Send”soft key to call
that number. After the target party answers the call, press "Transfer" soft key again to complete the
transfer.
2. Blind call transfer
The blind transfer allows user to transfer a call without speaking to the third party. On the user side,
the call will be ended as soon as the target phone number is dialed.
Operating steps: Press “More”soft key to get more option, then press “Bxfer”soft key, input the
transfer target number and press “Send”soft key.
3.6 Voicemail
A20/A21/A20W/A21W has a key for entering voicemail box. Press key to enter
the menu to configure voicemail number if never configure it previously. Otherwise, the voicemail
number will be called after press it. If you want to modify it after configured it, please go to the
Account webpage to modify the voicemail number.
3.7 Mute calls
The input audio will be not transmitted to peer phone after pressing key, and the phone
will be muted even switched among different modes of speaker, handset and headset. To un-mute,
just press key again.
3.8 3-Way Conference Call
To initiate a conference call:
Press “More”soft key on calling to get more options, then press “Conf”soft key to start a conference
call. Enter the phone number of the third party and press “Send”soft key to send it out.
1. After the third party answers the call, pressing "Conf" key again to establish the 3-way conference.
2. 3-way conference initiator can press "Exit" soft key to quit from the conference and leave the other
two parties still in the conversation.
3. If the initiator hangs up the call or press the “End Conf”soft key, the conference will be ended and
the calling between the other two parties will be hung up.

A20/A21/A20W/A21WIPPhoneUserManual A20/A21/A20W/A21WIPPhoneUserManual
21
21
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
21
21
ATCOM TECHNOLOGYCO., LIMITED
www.atcom.cn
3.9 Call History
A20/A21/A20W/A21W supports 200 missed calls list, 200 incoming calls list and 200 dialed calls list.
When the storage is full, the old record will be erased by the new one.
Press "History" soft key or key when A20/A21/A20W/A21W is standby, all the incoming(->),
outgoing(<-) and missed calls(!) will be listed. There is other ways to check them:
A. Missed call
1.
Press
key.
2.
Press
key and
key to select “Call History”then press “Select”soft key.
3.
Press
key and
key to select “Missed Calls”then press “Select”soft key.
4.
Press
key and
key to browse the missed call record. If there is no record, the LCD
display will be indicated “List is Empty”.
B. Answered call
1.
Press
key .
2.
Press
key and
key to choose “Call History”and then press “Select”soft key.
3.
Press
key and
key to choose “Answered Calls”and then press “Select”soft key.
4.
Press
key and
key to browse the answered call records. If there is no record, the LCD
display will be indicated “List is Empty”.
C. Dialed call
1)
Press
key.
2)
Press
key and
key to select "Call History" and then press “Select”soft key.
3)
Press
key and
key to select “Dialed Calls”and then press “OK”soft key.
4)
Press
key and
key to browse the dialed call records. If there is no record, the LCD
display will be indicated “List is Empty”.