Hello All, I am developing a SIP User Agent application using pjsip. I am following the instructions given in the the PJSIP Developer's guide. For learning, I chose core pjsip over the pjsua library abstraction. For the User Agent, I prefer TCP transport for listening and making outgoing calls. This is where my problem comes in. For TCP, I have promptly added ";transport=tcp" to the remote and target uri as per the FAQ http://trac.pjsip.org/repos/wiki/FAQ#tcp PJSIP uses TCP for sending invite to remote party. I get 180 ringing and 200 OK responses from the remote which are fine. But, the ACK to 200 OK is not sent in TCP. I get an error saying, the type is unspecified which pjsip defaults to UDP. I dont use any callback method to send ack from my application. PJSIP sends the ACK by itself. With wireshark sniffer, I could notice no ACK getting transmitted on wire. Do I need to specify anyother thing besides ";transport=tcp"? I have pasted the pjsip log below. Please help. If you require some more details, please let me know. Thanks in advance. *Some Details:* pjsip version: 1.10 OS: Linux *Log:* /* Initialization */ 15:18:57.019 os_core_unix.c pjlib 1.10.0 for POSIX initialized 15:18:57.019 sip_endpoint.c Creating endpoint instance... 15:18:57.019 pjlib select() I/O Queue created (0x8f9610) 15:18:57.019 sip_endpoint.c Module "mod-msg-print" registered 15:18:57.019 sip_transport. Transport manager created. 15:18:57.019 tcplis:5260 SIP TCP listener ready for incoming connections at 127.0.0.1:5260 15:18:57.019 sip_endpoint.c Module "mod-tsx-layer" registered 15:18:57.019 sip_endpoint.c Module "mod-stateful-util" registered 15:18:57.019 sip_endpoint.c Module "mod-ua" registered 15:18:57.019 sip_endpoint.c Module "mod-100rel" registered 15:18:57.019 sip_endpoint.c Module "mod-invite" registered 15:18:57.019 sip_endpoint.c Module "mod-mysip-ua" registered /* UAC Dialog creation and making a call */ 15:18:59.020 dlg0x906628 UAC dialog created 15:18:59.020 dlg0x906628 Module mod-invite added as dialog usage, data=0x908628 15:18:59.020 dlg0x906628 Session count inc to 2 by mod-invite 15:18:59.020 dlg0x906628 Module mod-100rel added as dialog usage, data=0x90aa40 15:18:59.020 dlg0x906628 100rel module attached 15:18:59.020 inv0x906628 UAC invite session created for dialog dlg0x906628 15:18:59.020 endpoint Request msg INVITE/cseq=125 (tdta0x90aa90) created. 15:18:59.020 inv0x906628 Sending Request msg INVITE/cseq=125 (tdta0x90aa90) 15:18:59.020 dlg0x906628 Sending Request msg INVITE/cseq=125 (tdta0x90aa90) 15:18:59.020 tsx0x90daa8 Transaction created for Request msg INVITE/cseq=124 (tdta0x90aa90) 15:18:59.020 tsx0x90daa8 Sending Request msg INVITE/cseq=124 (tdta0x90aa90) in state Null 15:18:59.020 sip_resolve.c Target '127.0.0.1:0' type=TCP resolved to ' 127.0.0.1:5060' type=TCP (TCP transport) 15:18:59.020 tcpc0x90e448 TCP client transport created 15:18:59.020 tcpc0x90e448 TCP transport 127.0.0.1:59402 is connecting to 127.0.0.1:5060... 15:18:59.020 tsx0x90daa8 State changed from Null to Calling, event=TX_MSG 15:18:59.020 dlg0x906628 Transaction tsx0x90daa8 state changed to Calling /* Receiving 180 ringing */ 15:18:59.021 tcpc0x90e448 TCP transport 127.0.0.1:59402 is connected to 127.0.0.1:5060 15:18:59.022 sip_endpoint.c Processing incoming message: Response msg 180/INVITE/cseq=124 (rdata0x90e728) 15:18:59.022 tsx0x90daa8 Incoming Response msg 180/INVITE/cseq=124 (rdata0x90e728) in state Calling 15:18:59.022 tsx0x90daa8 State changed from Calling to Proceeding, event=RX_MSG 15:18:59.022 dlg0x906628 Received Response msg 180/INVITE/cseq=124 (rdata0x90e728) 15:18:59.022 dlg0x906628 Route-set updated 15:18:59.022 dlg0x906628 Transaction tsx0x90daa8 state changed to Proceeding /* Receiving 200 OK */ 15:19:05.668 sip_endpoint.c Processing incoming message: Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:05.668 tsx0x90daa8 Incoming Response msg 200/INVITE/cseq=124 (rdata0x90e728) in state Proceeding 15:19:05.668 tsx0x90daa8 State changed from Proceeding to Terminated, event=RX_MSG 15:19:05.668 dlg0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:05.668 dlg0x906628 Route-set updated 15:19:05.668 dlg0x906628 Route-set frozen 15:19:05.668 dlg0x906628 Transaction tsx0x90daa8 state changed to Terminated /* PJSIP sends ACK for the 200 OK */ 15:19:05.668 inv0x906628 Got SDP answer in Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:05.668 inv0x906628 SDP negotiation done, status=0 15:19:05.668 inv0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728), sending ACK 15:19:05.668 endpoint Request msg ACK/cseq=124 (tdta0x9150e0) created. 15:19:05.668 dlg0x906628 Sending Request msg ACK/cseq=124 (tdta0x9150e0) *15:19:05.668 sip_resolve.c Target '127.0.0.1:0' type=Unspecified resolved to '127.0.0.1:5060' type=UDP (UDP transport) * << Here is the problem /* Retransmission */ 15:19:05.668 tsx0x90daa8 Timeout timer event 15:19:05.668 tsx0x90daa8 State changed from Terminated to Destroyed, event=TIMER 15:19:05.668 tdta0x90aa90 Destroying txdata Request msg INVITE/cseq=124 (tdta0x90aa90) 15:19:05.668 tsx0x90daa8 Transaction destroyed! 15:19:06.168 sip_endpoint.c Processing incoming message: Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:06.168 dlg0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:06.168 inv0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728), sending ACK 15:19:06.168 dlg0x906628 Sending Request msg ACK/cseq=124 (tdta0x9150e0) 15:19:06.168 endpoint Request msg ACK/cseq=124 (tdta0x9150e0): skipping target resolution because address is already set 15:19:07.168 sip_endpoint.c Processing incoming message: Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:07.168 dlg0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:07.168 inv0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728), sending ACK 15:19:07.168 dlg0x906628 Sending Request msg ACK/cseq=124 (tdta0x9150e0) 15:19:07.168 endpoint Request msg ACK/cseq=124 (tdta0x9150e0): skipping target resolution because address is already set 15:19:09.168 sip_endpoint.c Processing incoming message: Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:09.168 dlg0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:09.168 inv0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728), sending ACK 15:19:09.168 dlg0x906628 Sending Request msg ACK/cseq=124 (tdta0x9150e0) 15:19:09.168 endpoint Request msg ACK/cseq=124 (tdta0x9150e0): skipping target resolution because address is already set 15:19:13.168 sip_endpoint.c Processing incoming message: Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:13.168 dlg0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:13.168 inv0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728), sending ACK 15:19:13.168 dlg0x906628 Sending Request msg ACK/cseq=124 (tdta0x9150e0) 15:19:13.168 endpoint Request msg ACK/cseq=124 (tdta0x9150e0): skipping target resolution because address is already set 15:19:17.168 sip_endpoint.c Processing incoming message: Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:17.168 dlg0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:17.168 inv0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728), sending ACK 15:19:17.168 dlg0x906628 Sending Request msg ACK/cseq=124 (tdta0x9150e0) 15:19:17.168 endpoint Request msg ACK/cseq=124 (tdta0x9150e0): skipping target resolution because address is already set 15:19:21.168 sip_endpoint.c Processing incoming message: Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:21.168 dlg0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728) 15:19:21.168 inv0x906628 Received Response msg 200/INVITE/cseq=124 (rdata0x90e728), sending ACK 15:19:21.168 dlg0x906628 Sending Request msg ACK/cseq=124 (tdta0x9150e0) 15:19:21.168 endpoint Request msg ACK/cseq=124 (tdta0x9150e0): skipping target resolution because address is already set PS: Sorry if this mail appears twice in the mailing list. I forgot to subscribe before posting! Regards, Sundar -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20111007/9cec31db/attachment-0001.html>
