As it turns out, sipgate indeed does not support TCP signaling (neither do netvoip.ch or voipbuster.com). - Registration with TCP signaling works fine with placetel.de... - So, the code I posted is correct after all ... However, a little further down the road, I discovered a new problem - possibly somehow related, but I will open a new thread : "TCP re-registration fails in keepAliveFunction - PJSIP_EBUSY" Again thanks to Alejandro and Klaus. On Nov 22, 2010, at 13:56 , Alejandro Orellana wrote: > Does your registrar support tcp connections??? > > Have tried any other client?? > > On Nov 21, 2010, at 7:54 PM, Thomas Martin <tmemail at gmx.de> wrote: > >> Hi Everybody, >> >> working on an iOS4 App with SIP capabilities I am struggling to receive incoming_call notifications while being in background mode. >> >> I believe, my current problem has to do with the configuration of TCP as the transport (which is a prerequisite for this functionality). - I basically followed the pjsua-reference-implementation for UDP and TCP transport configuration and also appended "transport=tcp;" to the registrar-uri when adding an account. The following is what I see in the debugger console (iPhone-device - not simulator) once the App launched: >> >> ====================================================================================================================== >> >> 01:26:29.855 os_core_unix.c pjlib 1.8.5 for POSIX initialized >> 01:26:30.006 sip_endpoint.c Creating endpoint instance... >> 01:26:30.010 pjlib select() I/O Queue created (0x835f30) >> 01:26:30.011 sip_endpoint.c Module "mod-msg-print" registered >> 01:26:30.011 sip_transport. Transport manager created. >> 01:26:30.026 sip_endpoint.c Module "mod-pjsua-log" registered >> 01:26:30.027 sip_endpoint.c Module "mod-tsx-layer" registered >> 01:26:30.028 sip_endpoint.c Module "mod-stateful-util" registered >> 01:26:30.029 sip_endpoint.c Module "mod-ua" registered >> 01:26:30.030 sip_endpoint.c Module "mod-100rel" registered >> 01:26:30.030 sip_endpoint.c Module "mod-pjsua" registered >> 01:26:30.032 sip_endpoint.c Module "mod-invite" registered >> 01:26:30.038 coreaudio_dev. core audio initialized >> 01:26:30.040 pjlib select() I/O Queue created (0x83dc14) >> 01:26:30.076 sip_endpoint.c Module "mod-evsub" registered >> 01:26:30.078 sip_endpoint.c Module "mod-presence" registered >> 01:26:30.079 sip_endpoint.c Module "mod-mwi" registered >> 01:26:30.079 sip_endpoint.c Module "mod-refer" registered >> 01:26:30.079 sip_endpoint.c Module "mod-pjsua-pres" registered >> 01:26:30.080 sip_endpoint.c Module "mod-pjsua-im" registered >> 01:26:30.080 sip_endpoint.c Module "mod-pjsua-options" registered >> 01:26:30.080 pjsua_core.c 1 SIP worker threads created >> 01:26:30.080 pjsua_core.c pjsua version 1.8.5 for arm-apple-darwin9 initialized >> 01:26:30.083 pjsua_core.c SIP UDP socket reachable at 192.168.1.102:55796 >> 01:26:30.085 udp0x844800 SIP UDP transport started, published address is 192.168.1.102:55796 >> 01:26:30.087 pjsua_acc.c Account <sip:192.168.1.102:55796> added with id 0 >> 01:26:30.089 tcplis:55796 SIP TCP listener ready for incoming connections at 192.168.1.102:55796 >> 01:26:30.090 pjsua_acc.c Account <sip:192.168.1.102:55796;transport=TCP> added with id 1 >> 01:26:30.093 pjsua_media.c RTP socket reachable at 192.168.1.102:4000 >> 01:26:30.093 pjsua_media.c RTCP socket reachable at 192.168.1.102:4001 >> 01:26:30.096 pjsua_media.c RTP socket reachable at 192.168.1.102:4002 >> 01:26:30.096 pjsua_media.c RTCP socket reachable at 192.168.1.102:4003 >> 01:26:30.098 pjsua_media.c RTP socket reachable at 192.168.1.102:4004 >> 01:26:30.098 pjsua_media.c RTCP socket reachable at 192.168.1.102:4005 >> 01:26:30.101 pjsua_media.c RTP socket reachable at 192.168.1.102:4006 >> 01:26:30.101 pjsua_media.c RTCP socket reachable at 192.168.1.102:4007 >> 01:26:30.102 sip_endpoint.c Module "mod-unsolicited-mwi" registered >> 01:26:47.518 pjsua_acc.c Account sip:abcdefg at sipgate.de added with id 2 >> 01:26:47.529 tcpc0x89da14 TCP client transport created >> 01:26:47.530 tcpc0x89da14 TCP transport 192.168.1.102:49774 is connecting to 217.10.79.9:5060... >> 01:26:47.530 pjsua_core.c TX 575 bytes Request msg REGISTER/cseq=15489 (tdta0x89ca00) to tcp 217.10.79.9:5060: >> REGISTER sip:sipgate.de;transport=tcp SIP/2.0 >> Via: SIP/2.0/TCP 192.168.1.102:49774;rport;branch=z9hG4bKPjtxO7dXv3Agj8FtQQBEuJw6Io7fMZrlui >> Route: <sip:sipgate.de;transport=tcp;lr> >> Max-Forwards: 70 >> From: <sip:abcdefg@xxxxxxxxxx>;tag=WnuqiBOF4NQDbj5VyO.jf9x9jCP2LbZi >> To: <sip:abcdefg at sipgate.de> >> Call-ID: F8QztBfWuoR2DzFOmfiM2WUNhhaE.B-b >> CSeq: 15489 REGISTER >> User-Agent: SIP01 >> Contact: <sip:abcdefg at 192.168.1.102:55796;transport=TCP> >> Expires: 300 >> Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS >> Content-Length: 0 >> >> >> --end msg-- >> 01:26:47.531 pjsua_acc.c Registration sent >> 01:26:47.781 tcpc0x89da14 TCP connect() error: Connection refused [code=120061] >> 01:26:47.782 tsx0x872064 Failed to send Request msg REGISTER/cseq=15489 (tdta0x89ca00)! err=120061 (Connection refused) >> 01:26:47.782 pjsua_acc.c SIP registration failed, status=503 (Connection refused) >> >> Service Unavailable Statuscode -1 AccountID2 >> >> 01:26:47.791 pjsua_acc.c Account id 2 deleted >> >> 01:26:47.791 tcpc0x89da14 TCP transport destroyed with reason 120061: Connection refused >> >> ===================================================================================================================== >> >> When I do NOT append "transport=tcp;" to the registrar-uri (hence, TCP is not used) the account registration is successful - in this case, no notifications are received, though, while in backgroundmode. - I have tried different SIP services (e.g. netvoip.ch, VoipBuster) yielding the same result. >> >> Any hints are greatly appreciated!! >> >> Cheers, >> >> Thomas >> >> >> _______________________________________________ >> Visit our blog: http://blog.pjsip.org >> >> pjsip mailing list >> pjsip at lists.pjsip.org >> http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > Statement of Confidentiality > The contents of this e-mail message and any attachments are confidential and are intended solely for the addressee. 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