TB30s SIP Administrator Guide v1.3 Page 210 of 259
Call-info header with Answer-after parameter
This new feature allows the phone to answer a call automatically and in
handsfree mode if the phone is on-hook which is comfortable for the user
since he doesn‟t have to take any action to be able to speak.
But this already existed in previous versions as a local feature of the phone.
The main difference of this new supported parameter is that the automatic
answer is indicated by the server for a particular call, not by the user and for
all calls .This new behavior is used by some servers (e.g: BroadSoft) to
implement Click-to-call facility where the party that appears in the call as
“From” URI shouldn‟t ring as the “To” does.
Feature activation
It can‟t be activated or deactivated. This new supported feature doesn‟t
enter in conflict with any other. It‟s implicitly activated when receiving and
INVITE of this kind:
The Call-Info header field provides additional information about the caller or
callee, depending on whether it is found in a request or response. To support
intercom and click-to-call scenarios, we introduce a parameter called
“answer-after”. When present in the Call-Info header of an incoming INVITE
request, it indicates how many seconds should be waited by the UAS before
the call is automatically answered.
If the “answer-after” value is 0, then the call should be automatically
answered without applying any alert tones. If it‟s 1,2,3… then phone will ring
1,2,3… seconds before the call is answered.
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