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List:       sip-implementors
Subject:    RE: [Sip-implementors] INVITE without SDP
From:       "Christer Holmberg (JO/LMF)" <christer.holmberg () ericsson ! com>
Date:       2004-03-17 12:19:26
Message-ID: F8EFC4B4A8C016428BC1F589296D4FBF07B07BDD () esealnt630 ! al ! sw ! ericsson ! se
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Hi,

Some nodes don't support INVITE without SDP, even if it's allowed in the standard.

If you send an INVITE without SDP, there is no way to say "I want a vocal session". \
Of course, when you receive an offer in 200 OK you can accept/reject the media types \
and payloads you want, and indicate that in your answer sent in the ACK.

Regards,

Christer Holmberg
Ericsson Finland




-----Original Message-----
From: sip-implementors-bounces@cs.columbia.edu \
                [mailto:sip-implementors-bounces@cs.columbia.edu]On Behalf Of \
                cedric.barret@ferma.fr
Sent: 17. maaliskuuta 2004 14:06
To: sip-implementors@cs.columbia.edu
Subject: [Sip-implementors] INVITE without SDP


Hello,

draft-ietf-sipping-3pcc-06.txt refers to INVITE messages sent without SDP body so as \
to manage third party call control. But how a such INVITE must be formated (which \
headers...) so as to invoke called party to send generate the offer in its 200 \
response, and to be shure the offerd session will be a vocal session (for example). I \
tried to send INVITE (See above message) request to a free Sip phone, but it responds \
with a status error to my request. and does not sends back any offer.

Message sent:
INVITE sip:0476617945@172.17.2.183 SIP/2.0
Via: SIP/2.0/UDP 172.17.119.1;maddr=172.17.119.1;branch=z9hG4bK3f31158-2155
Max-Forwards: 70
Supported: 100rel
From: <sip:0476617951@172.17.119.1>;tag=161546080
To: <sip:0476617945@172.17.2.183>
Call-ID: 17625@172.17.119.1
CSeq: 1 INVITE
Contact: <sip:0476617951@172.17.119.1;maddr=172.17.119.1>
Content-Length: 0

Message received:
SIP/2.0 500 Internal server error (cannot align media streams)
Content-Length: 0
Contact: <sip:172.17.2.183:5060>
Call-ID: 17625@172.17.119.1
CSeq: 1 INVITE
From: <sip:0476617951@172.17.119.1>;tag=161546080
To: "0476617954"<sip:0476617945@172.17.2.183>;tag=8143920
Via: SIP/2.0/UDP 172.17.119.1:5060;maddr=172.17.119.1;branch=z9hG4bK3f31158-2155

Thank you for your help.

Cédric.

-- 
Cédric BARRET
IN & GSM Infrastructure Department 
FERMA, ZIRST, 31 Chemin du Vieux Chene 
38240 MEYLAN, FRANCE 

Tel : +33 (0)4.76.61.79.00 
Fax : +33 (0)4.76.61.79.59 
Mail: cedric.barret@ferma.fr 
WWW : http://www.ferma.fr 

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