Aastra Telecom 55I User Manual

Operational Features

5-60

41-001160-00, Release 2.1, Rev 04  

IP Phone Administrator Guide

The Intercom feature allows you to press the configured Intercom button on the IP 
phone and then enter the number you want to call to initiate an intercom call. 
Intercom calls can be controlled either locally (phone-side) or by the SIP server 
(server-side).

You can configure incoming and outgoing intercom calls on all phone models. A 
User can configure incoming intercom calls only.

On outgoing intercom calls, an available unused line is found when the Icom 
button is pressed. Since this line has no configuration, the phone applies an 
existing configuration ("Outgoing Intercom Settings", Line, default is Line 1) to 
this line in preparation for placing the intercom call. For example, an outgoing 
intercom call can use the configuration of line 1 but places the actual intercom call 
using line 9. Only an Administrator can configure outgoing intercom calls.

A phone-side Intercom call indicates the phone is responsible for telling the 
recipient that an intercom call is being placed, while a server-side intercom call 
means the SIP server is responsible for informing the recipient. Server-side calls 
require additional configuration of a prefix code.  After pressing the Icom button 
and entering the number to call, the phone automatically adds the prefix to the 
called number and sends the outgoing call via the server. 

For outgoing intercom calls, an administrator can configure the following 
parameters:

•

sip intercom type

•

Type)

•

sip intercom prefix code

•

Prefix Code

•

sip intercom line

•

Line

To configure outgoing intercom calls using these parameters, see 

.