Aastra Telecom 53I - Manual (Page 106)

Sylantro Interoperability Features
100 RN-001029-00, Rev 03, Release 2.1
IP Phone Release Notes 2.1
Support For “Delay” before Auto-Answer
Aastra IP Phones now include support for the "delay" parameter (in the Alert-Info
header, used in conjunction with info=alert-autoanswer) in order to facilitate
auto-answer functionality. When present, the value of the "delay" parameter
specifies the length of time in seconds an IP phone rings before a call is
auto-answered. If this value of the "delay" parameter set to 0 (delay=0), then an
incoming call is immediately auto-answered. The absence of the parameter is
considered as ring forever.
In order for the delay functionality to operate, you must first enable the
Auto-Answer feature on the IP phone, as follows:
• Using the Aastra Web UI, see Basic Settings->Preferences-> Incoming
Intercom Settings . Set the “ Auto-Answer ” parameter to Enabled .
• Using the configuration files, set sip allow auto answer to 1 .
See the SIP IP Phone Administrator Guide for more information on configuring
Auto-Answer using either the Web UI, or the configuration files.