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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: 17. maaliskuuta 2004 14:06 To: [EMAIL PROTECTED] 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:[EMAIL PROTECTED] 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:[EMAIL PROTECTED]>;tag=161546080 To: <sip:[EMAIL PROTECTED]> Call-ID: [EMAIL PROTECTED] CSeq: 1 INVITE Contact: <sip:[EMAIL PROTECTED];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: [EMAIL PROTECTED] CSeq: 1 INVITE From: <sip:[EMAIL PROTECTED]>;tag=161546080 To: "0476617954"<sip:[EMAIL PROTECTED]>;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. C�dric. -- C�dric 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: [EMAIL PROTECTED] WWW : http://www.ferma.fr This communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe this message has been sent to you in error, please notify the sender by replying to this transmission and delete the message without disclosing it. Thank you. E-mail including attachments is susceptible to data corruption, interruption, unauthorized amendment, tampering and viruses, and we only send and receive e-mails on the basis that we are not liable for any such corruption, interception, amendment, tampering or viruses or any consequences thereof. _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
