Hi list, I am having some issues parsing multipart INVITE [1] when calling force_rtp_proxy . I tried to upgrade to Kamailio 5 to see if maybe i was using too old code but seems not the case. Log of error is: Apr 3 18:31:21 mcptt /usr/sbin/kamailio[3232]: INFO: <script>: forcing RTP proxy for INVITE message Apr 3 18:31:21 mcptt /usr/sbin/kamailio[3232]: ERROR: <core> [core/parser/parse_content.c:370]: decode_mime_type(): ERROR:decode_mime_type: parse error near in [application/vnd.3gpp.mcptt-info+xml] char[51][3] offset=16 So seems there is some issue using Content Type application/vnd.3gpp.mcptt-info+xml in a multipart SIP message But this content type is accepted at following 3GPP spec: http://www.etsi.org/deliver/etsi_ts/129100_129199/129165/13.06.00_60/ts_129… Checking implementation of parse_content.c I see ". - _ +" characters are accepted so i am not sure what is failing. I did some test and if instead of that Content-Type: application/vnd.3gpp.mcptt-info+xml i use Content-Type: application/mcptt no errors are seen in Kamailio logs and ports are replaced succesfully. So do you see something wrong on what i am doing with attached info? INVITE sip:mcpttparticipating@demo.net SIP/2.0 Record-Route: <sip:10.1.1.123:6074;transport=tcp;lr=on;ftag=i3b01a;nat=yes> Call-ID: db6b10362447354bc9819df9a9046ecb(a)10.1.1.222 CSeq: 1 INVITE From: <sip:blue1@demo.net>;tag=i3b01a To: <sip:ccw@demo.net;poc-group=blues> Via: SIP/2.0/TCP 10.1.1.123:6074 ;branch=z9hG4bK15a9.1c063dec40e772152f44c026a1627082.0;i=f Via: SIP/2.0/TCP 10.1.1.222:5070 ;received=10.1.1.222;rport=55173;branch=z9hG4bK-363135-1750dc6e97437e4788f446f2d818b60a Max-Forwards: 69 Contact: <sip:blue1@10.1.1.222:55173 Accept-Contact: *;+g.3gpp.mcptt;require;explicit Accept-Contact: *;+g.3gpp.icsi-ref="urn:urn-7:3gpp-service.ims.icsi.mcptt";require;explicit P-Preferred-Service: urn:urn-7:3gpp-service.ims.icsi.mcptt P-Preferred-Identity: <sip:blue1@demo.net> User-Agent: PoC-client/3GPP-Rel13 DemoClient/v2.03.01/BV6000/SDK23 Session-Expires: 3600 Min-SE: 90 Supported: replaces, 100rel, timer, norefersub, timer, answermode, eventlist Resource-Priority: mcpttp.5 Content-Type: multipart/mixed;boundary=gnkboundary Content-Length: 997 --gnkboundary Content-Type: application/sdp v=0 o=- 3626700268 3626700268 IN IP4 10.1.1.222 s=spimedia c=IN IP4 10.1.1.222 t=0 0 a=X-nat:0 m=audio 10002 RTP/AVP 106 a=rtcp:10003 IN IP4 10.1.1.222 i=speech a=rtpmap:106 AMR-WB/16000 a=fmtp:106 mode-change-period=1; mode-change-capability=2; mode-change-neighbor=0; max-red=0 a=sendrecv a=ptime:100 a=maxptime:400 m=application 10003 udp MCPTT a=fmtp:MCPTT mc_queueing;mc_priority=1 --gnkboundary Content-Type: application/vnd.3gpp.mcptt-info+xml <?xml version="1.0" encoding="UTF-8"?> <mcpttinfo xmlns="urn:3gpp:ns:mcpttInfo:1.0" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance"> <mcptt-Params> <session-type>chat</session-type> <mcptt-request-uri type="Normal"> <mcpttURI>sip:ccw@demo.net;poc-group=blues</mcpttURI> </mcptt-request-uri> <mcptt-client-id type="Normal"> <mcpttURI>urn:uuid:00000000-0000-1000-8000-AABBCCDDEEFF</mcpttURI> </mcptt-client-id> </mcptt-Params> </mcpttinfo> --gnkboundary-- Thanks! Albert