Intercom

From Snom Asterisk Portal

Contents 1 Feature description 2 Configure Asterisk 3 Configure snom phones 3.1 snom 3xx 3.2 snom m3

Feature description

Intercom enables users to use two phones like a doorphone. One user dials a star code or presses a special key and a two way audio channel will be established automatically. The second user does not need to take the handset off the hook. The handsfree mode will be activated and both users can speak with each other.

Configure Asterisk

In asterisk intercom works just like a normal call. You need to tell the called phone to automatically answer the call.
To achieve this you need to set an additional SIP header in your dialplan.

Example:

[snom-intercom-context]
Exten => 9155,1,SIPAddHeader(Call-Info: sip:pbx.your-company.de;answer-after=0)
Exten => 9155,2,Dial(SIP/155)

Configure snom phones

snom 3xx

1. For audible indication when an incoming call is automatically answered by your phone: Enable "auto_connect_indication" under "Preferences" > section "Auto Answer" > "Auto Answer Indication". Set this option to "on".
2. Additionally, when you want to receive the incoming call in handsfree mode: Go to "auto_connect_type" under "Preferences" > section "Auto Answer" > "Type of Answering:". Set this option to "Handsfree".
3. Go to the phones's Web User Interface > "Function keys" and configure a free function key for intercom. Choose for "Context:" <Your SIP Identity>, for "Type:" Intercom, for "Number:" <extension>.
4. To use Intercom, you only have to press the configured function key.

snom m3

The M3 has inbuilt intercom feature based on DECT. Intercom through SIP (Call-Info header) is not supported.

Intercom function can be accessed through the handset menu. There you can either select all handset or individual handsets to be called.

This also works without having SIP identities configured.