Since the ACK is for a non 2xx, the ACK must be sent to IP address and port where INVITE was sent.
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf > Of Rayees Khan > Sent: Tuesday, May 08, 2007 1:17 PM > To: Joerg Scholz; [email protected] > Subject: Re: [Sip-implementors] echot contact field in 401 > > > The ACK needs to be sent on the address that is mentioned in > the Contact header of reponse, unless it is overridden by > Record-Route etc. > I assume that there is some error in UAS here which is causing this. > However, if UAC acts according to protocol it would send ACK > to 172.20.16.1. > > > regards > Rayees > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf > Of Joerg Scholz > Sent: Tuesday, May 08, 2007 3:46 PM > To: '[email protected]' > Subject: [Sip-implementors] echot contact field in 401 > > Hi all, > > I have a quick question regarding the usage of the Contact > field in 401 message. In the trace here you can see that in > the 401 the contact field from the invite is just send back. > So for my understanding the ack to the > 401 is send then to the own IP address in such a case. Is > there any rule for that specific behaviour? > > > > INVITE sip:[EMAIL PROTECTED] SIP/2.0 > > Max-Forwards: 50 > > Via: SIP/2.0/UDP > 172.20.16.1:5060;rport;branch=z9hG4bK23268366631621974202502 > > From: <sip:[EMAIL PROTECTED]>;tag=723776519979065179735928398741 > > To: <sip:[EMAIL PROTECTED]> > > Call-ID: [EMAIL PROTECTED] > > CSeq: 1 INVITE > > Contact: <sip:[EMAIL PROTECTED]> > > User-Agent: TELES.VoIPBOX FX 13.0b 885 > > Allow: INVITE,ACK,CANCEL,BYE,UPDATE,REGISTER,PRACK,INFO,NOTIFY,REFER > > Timestamp: 1175605035 > > Content-Type: application/sdp > > Content-Length: 520 > > v=0 > > o=- 6 1 IN IP4 172.20.16.1 > > s=- > > c=IN IP4 172.20.16.1 > > t=0 0 > > m=audio 29000 RTP/AVP 18 18 18 18 4 0 8 > > a=rtpmap:18 G729/8000 > > a=fmtp:18 annexb=no > > a=ptime:20 > > a=rtpmap:18 G729A/8000 > > a=fmtp:18 annexb=no > > a=ptime:20 > > a=rtpmap:18 G729B/8000 > > a=fmtp:18 annexb=yes > > a=ptime:20 > > a=rtpmap:18 G729AB/8000 > > a=fmtp:18 annexb=yes > > a=ptime:20 > > a=rtpmap:4 G723/8000 > > a=fmtp:4 annexa=yes > > a=ptime:60 > > a=rtpmap:0 PCMU/8000 > > a=ptime:20 > > a=rtpmap:8 PCMA/8000 > > a=ptime:20 > > > > SIP/2.0 401 Unauthorized > > Via: SIP/2.0/UDP > 172.20.16.1:5060;rport;branch=z9hG4bK23268366631621974202502 > > From: <sip:[EMAIL PROTECTED]>;tag=723776519979065179735928398741 > > To: <sip:[EMAIL PROTECTED]>;tag=GR52RWG346-34 > > Call-ID: [EMAIL PROTECTED] > > CSeq: 1 INVITE > > Contact: <sip:[EMAIL PROTECTED]> > > WWW-Authenticate: Digest realm="192.168.1.1", > nonce="1D9C86B49DD0C77FB73188939DA7E174", > opaque="9CCC512F6BCF46A90987581E8F4FCCD9", algorithm=md5 > > User-Agent: TELES.VoIPBOX FX 13.0b 885 > > Timestamp: 1175605035 > > Content-Length: 0 > > > > Thanks in Advance > > Joerg > > > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please visit > http://www.messagelabs.com/email > ______________________________________________________________________ > > > > > -------------------------------------------------------------- > -------------------- > IMPORTANT The information contained in this e-mail any > attachments is intended only for the named recipient and may > be privileged or confidential. > > If you are not the intended recipient, please notify us > immediately on +44 (0)1908 425000 and do not disclose, copy, > distribute or take any action based on the contents of this e-mail. > > You should understand and accept that, when communicating > with us by e-mail, it is not a totally secure communication medium. > > We accept no liability for any direct, indirect or > consequential loss arising from any action taken in reliance > on the information contained in this e-mail and give no > warranty or representation as to its accuracy or reliability. > > DIGITALK has the facility to monitor and read both incoming > and outgoing communications by e-mail. 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