asterisk users - Jun 2009 - Question regarding SIP 183 "Session Progress" handling in Asterisk

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, Saalachstra?e 51
Tel: +43-662-85 62 25 312
Sip: f.floimair at commend.com <file:///T:\KAT\Signaturen\=%22sip:f.floimair
at commend.com%22>
Fax: +43-662-85 62 26
f.floimair at commend.com <mailto:f.floimair at commend.com> 
http://www.commend.com <http://www.commend.com/> 

Security and Communication by Commend

FN 178618z | LG Salzburg

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://lists.digium.com/pipermail/asterisk-users/attachments/20090630/a3491459/attachment.htm

Floimair Florian schrieb:
> 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.
Which version of Asterisk?
> 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.
What they tell you might actually be correct. Not sure.
> Sip: f.floimair at commend.com
<file:///T:\KAT\Signaturen\=%22sip:f.floimair at commend.com%22>
Something went wrong here. JFYI.


    Philipp Kempgen
-- 
AMOOMA GmbH - Bachstr. 126 - 56566 Neuwied  ->  http://www.amooma.de
Gesch?ftsf?hrer: Stefan Wintermeyer, Handelsregister: Neuwied B14998
Asterisk: http://the-asterisk-book.com - http://das-asterisk-buch.de
Videos of the AMOOCON VoIP conference 2009 ->  http://www.amoocon.de
--