Aastra Telecom C53I User Guide

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Operational Features
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41-001160-00, Rev 01  Release 2.0  
IP Phone Administrator Guide
Operational IP Phone Features
Incoming/Outgoing Intercom with Auto-Answer
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).
Auto-Answer
The auto-answer feature on the IP phone allows you to enable or disable 
automatic answering for an Intercom call. If “Auto-Answer” is enabled, the phone 
automatically answers an incoming intercom call. If “Play Warning Tone” is also 
enabled, the phone plays a tone to alert the user before answering the intercom 
call. If “Auto-Answer” is disabled, the phone rejects the incoming intercom call 
and sends a busy signal to the caller.
Outgoing Intercom Calls (55i, 57i and 57i CT 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.
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. 
Note: 
Auto-answer and intercom are applicable to all IP phone models. 
Outgoing intercom settings are applicable to the (55i, 57i, and 57i CT 
only.) A user can only set the incoming intercom settings on the IP phone. 
An administrator can set both the incoming and outgoing intercom 
settings.