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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. Cédric. --
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