[asterisk-users] Question regarding SIP 183 "Session Progress" handling in Asterisk

[Floimair Florian]

Dear Asterisk community!

 

I am having trouble with a project concerning the 183 Session Progress SIP messages. Asterisk seems to only accept these when there is also a Session Description (SDP) included in the message.

I also verified this by looking at the code.

 

However for a project we are working with a trunk to a third party system (Alcatel) and they are insisting that this behavior is non-compliant with RFC3261 (SIP). So can someone please tell me the reason,

why Asterisk does not support 183 messages without SDP as this would really help me finding arguments in this situation. So far Alcatel just tells us that this is not SIP-compliant and that we have to change things

on the Asterisk side, but I'm not quite sure that this is really the case and having arguments could help me clarifying this situation.

 

Thanks in advance.

 

With best regards

Florian Floimair
Technical Support

COMMEND INTERNATIONAL GMBH
A-5020 Salzburg, Saalachstraße 51
Tel: +43-662-85 62 25 312
Sip: f.floimair at commend.com <file:///T:\KAT\Signaturen\=%22sip:f.floimair@commend.com%22> 
Fax: +43-662-85 62 26
f.floimair at commend.com <mailto:f.floimair at commend.com> 
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