Hi users of MSRP module, I just set up MSRP module with Kamailio 4.4.3 & blink client on Windows. What I am noticing is messages are coming though one-way. When other side replies, they are relayed back to itself instead of target. Msrp layer of the relayed packet is built fine, but tcp destination is set wrong. I am suspecting it is either due to wrong use of msrp_set_dst in Kamailio.cfg (attached) or a bug in msrp_relay method in the module itself. I am new to this area, please suggest how to troubleshoot this. Find below the trace of msrp messages of the issue. My analysis of the msrp trace is *in purple*. *Some points to note:* 10.11.200.24 and 10.0.0.5 are nics on same box and are marked in same color as is called “source”. 10.11.52.53 is “target” machine, where the relayed message should go to. 10.0.16.51 is the relay server * Question to answer:***Why is Message3 below sent to source tcp ip address (10.11.200.24) instead of target tcp address (10.11.52.53). * * ---------------------------------------------------------------------------------------------------- *Message1 is sent from source to target + relay session*** *Message1:*2016-11-08 15:47:17.338892 [blink.exe 26372]: 10.11.200.24:62680 --> 10.0.16.51:2855 MSRP 5f0c96c84796750d SEND To-Path: msrp://10.0.16.51:2855/s.12455.7.1628740562;tcp msrp://10.11.52.53:2855/b5e6018fca0bdddfcea2;tcp From-Path: msrp://10.0.0.5:62680/7549e765f173b8ae2250;tcp Message-ID: d54ab6cddfffb429 Byte-Range: 1-375/375 Success-Report: no Failure-Report: partial Content-Type: message/cpim From: pvenkatayogi <sip:pvenkatayogi@labsip00.cyracom.com> To: <sip:pranathi@labsip00.cyracom.com> DateTime: 2016-11-08T15:47:17.336892-06:00 MIME-Version: 1.0 Content-Type: application/im-iscomposing+xml <?xml version='1.0' encoding='UTF-8'?> <isComposing xmlns="urn:ietf:params:xml:ns:im-iscomposing"><state>active</state><contenttype>text</contenttype></isComposing> -------5f0c96c84796750d$ *Message2 is sent from relay server to source with 200 OK*** *Message2: *2016-11-08 15:47:17.418908 [blink.exe 26372]: 10.11.200.24:62680 <-- 10.0.16.51:2855 MSRP 5f0c96c84796750d 200 OK To-Path: msrp://10.0.0.5:62680/7549e765f173b8ae2250;tcp From-Path: msrp://10.0.16.51:2855/s.12455.7.1628740562;tcp Message-ID: d54ab6cddfffb429 -------5f0c96c84796750d$ *Message3 is **wrongly sent to source**, though the to-path in msrp packet is pointing to target.*** *Message3: *2016-11-08 15:47:17.423909 [blink.exe 26372]: 10.11.200.24:62680 <-- 10.0.16.51:2855 MSRP 5f0c96c84796750d SEND To-Path: msrp://10.11.52.53:2855/b5e6018fca0bdddfcea2;tcp From-Path: msrp://10.0.16.51:2855/s.12455.7.1628740562;tcp msrp://10.0.0.5:62680/7549e765f173b8ae2250;tcp Message-ID: d54ab6cddfffb429 Byte-Range: 1-375/375 Success-Report: no Failure-Report: partial Content-Type: message/cpim From: pvenkatayogi <sip:pvenkatayogi@labsip00.cyracom.com> To: <sip:pranathi@labsip00.cyracom.com> DateTime: 2016-11-08T15:47:17.336892-06:00 MIME-Version: 1.0 Content-Type: application/im-iscomposing+xml <?xml version='1.0' encoding='UTF-8'?> <isComposing xmlns="urn:ietf:params:xml:ns:im-iscomposing"><state>active</state><contenttype>text</contenttype></isComposing> -------5f0c96c84796750d$ *Message4 is source machine rightly rejecting the Message3 above saying it is not for me.* *Message4: * 2016-11-08 15:47:17.429911 [blink.exe 26372]: 10.11.200.24:62680 --> 10.0.16.51:2855 *MSRP 5f0c96c84796750d 481 Invalid To-Path* To-Path: msrp://10.0.16.51:2855/s.12455.7.1628740562;tcp From-Path: msrp://10.11.52.53:2855/b5e6018fca0bdddfcea2;tcp -------5f0c96c84796750d$ ----------------------------------------------------------------------------------------------- *Pranathi Venkatayogi* /System Developer II/ (520) 745-9447 x4466 www.cyracom.com <http://www.cyracom.com/> Join us: cid:image001.gif@01D1C9C9.C4E8B6D0 <https://www.facebook.com/pages/CyraCom-LLC/134704783312720> cid:image002.gif@01D1C9C9.C4E8B6D0 <https://twitter.com/cyracom> cid:image003.gif@01D1C9C9.C4E8B6D0 <http://www.linkedin.com/company/cyracom> cid:image004.gif@01D1C9C9.C4E8B6D0 <http://www.cyracom.com/blog/> cid:image005.png@01D1C9C9.C4E8B6D0 DISCLAIMER: This e-mail and any attached content may contain confidential or privileged material delivered for the sole use of the intended recipient(s). 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