Dear,
Thanks for the resposes.
By the way, I have a question about Call-Info header usage.
According to RFC3261, we see the angle-bracketed uri should be placed at the
right side of HCOLON. However, as Andrew mentioned, I see many instances which
do not contain the uri in Call-Info headers. Isn't it violation of the RFC? or
just acceptable conventionally?
=== RFC3261 ===
Call-Info = "Call-Info" HCOLON info *(COMMA info)
info = LAQUOT absoluteURI RAQUOT *( SEMI info-param)
info-param = ( "purpose" EQUAL ( "icon" / "info"
/ "card" / token ) ) / generic-param
Best,
Lee, Sungwoo
------- Original Message -------
Sender : Andrew Pogrebennyk<[email protected]>
Date : 2010-02-02 00:08 (GMT+09:00)
Title : Re: [Sip-implementors] Auto-Answer for Incoming call
On 01.02.2010 03:53, 이성우 wrote:
> Dear all,
>
> What do you think the best current practices for implementing auto-answer? I
> think different vendors are using each different ways to do that. Among them,
> I found following three are most common (I may be wrong).
>
> 1. Call-Info: answer-after=0
> 2. Alert-Info: info=alert-autoanswer
> 3. Notify Event: talk
You are right in that different vendors are using different ways to
signal auto-answer:
Polycom - Alert-Info: Auto Answer
(note that Polycom is case sensitive for "Alert-Info" attribute)
Aastra 5xi - Alert-Info: info=alert-autoanswer
(These are conflicting, as Alert-Info is defined as non-multiple and
non-structured header)
Linksys - Call-Info: =\;answer-after=0
So your safest bet would be to send both:
Alert-Info: Auto Answer
Call-Info: =\;answer-after=0
Of course YMMV may vary depending on what equipment you are planning to use.
> So, where would you vote for based on RFCs? If any different idea, please let
> me know.
I'm not aware of any standards or drafts that describe the above
variants. And RFC 5373 defines yet another special header Answer-Mode.
--
Sincerely,
Andrew Pogrebennyk
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