Hi Attila, thanks for your reply. I am sure that I know this is how it should work but when I try to use the local RTP port (22456), I could not send anything to the server. On the other hand when I change the local RTP port number to 5060, I can see the RTP packets on my network sniffer like this
1.2.3.4 ---> 3.4.5.6 RTP PT=ITU-T G.711 PCMA, SSRC=0xDF53, Seq = 45, Time=12960 (Client to Server) 1.2.3.4 ---> 3.4.5.6 RTP PT=ITU-T G.711 PCMA, SSRC=0xDF53, Seq = 46, Time=13120. 3.4.5.6 ---> 1.2.3.4 RTP PT=ITU-T G.711 PCMA, SSRC=0xF231, Seq = 3457, Time=160(Server to Client) 1.2.3.4 ---> 3.4.5.6 RTP PT=ITU-T G.711 PCMA, SSRC=0xDF53, Seq = 47, Time=13280. 3.4.5.6 ---> 1.2.3.4 RTP PT=ITU-T G.711 PCMA, SSRC=0xF231, Seq = 3458, Time=320 and so on.... that is what I dont understand, how this is happening. So in general am I making some weird mistake. Regards On Mon, Mar 7, 2011 at 6:47 PM, Attila Sipos <[email protected]>wrote: > >> is this normal to send RTP packets from the local port = *5060(SIP > PORT)* > >> with remote port = *18564 *and receive RTP packets from SIP Server on > local > >> port = *22456 * with remote port = *18564. > > You are confusing 2 separate things: > 1. there is a SIP signalling port 5060 - this is used only to receive > SIP messages > 2. there is a RTP port 22456 > > Your RTP packets should use the local RTP port (22456) as the RTP port. > > > 1. SIP and RTP are separate > 2. SIP and RTP use separate ports > 3. do not mix SIP and RTP ports - in your example you used the SIP port > as the local RTP port - this will not work! > > I hope this helps > > Regards > > Attila > > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Siga > Sent: 07 March 2011 17:32 > To: [email protected] > Subject: [Sip-implementors] Ports for sending and receiving RTP packets! > > Hi, > I am facing rather a strange problem with the ports for sending and > receiving RTP packets. > This is the second time I am posting my question. > > Initially I am able to set up a SIP Client successfully > > SIP CLIENT SIP SERVER > (1.2.3.4) (3.4.5.6) > > > INVITE: 1.2.3.4:5060 > --------------------------------------------> > > 100 Trying: 3.4.5.6 > <--------------------------------------------- > > > 200 OK: 3.4.5.6 > <-------------------------------------------- > > > ACK: 1.2.3.4:5060 > --------------------------------------------> > > > RTP Packets > --------------------------------------------> > > Here comes the problem: my SIP Client INVITE looks like this > > "INVITE > sip:[email protected]/2.0\r\n" > "Via:SIP/2.0/UDP > 192.168.x.000:5060;branch=z9hG4bKdg18\r\n" > "Max-Forwards: 70\r\n" > "To: server <sip:[email protected]>\r\n" > "From: User<sip:[email protected]>; > tag = 76341\r\n" > "Call-ID: > [email protected]@192.168.x.x\r\n" > "CSeq: 1 INVITE\r\n" > "Contact: > <sip:[email protected]>\r\n" > "Content-Type: application/sdp\r\n" > "Content-Length:142\r\n"; > "\r\n" > "v=0\r\n" > "o=User 53655765 2353687637 IN IP4 > 192.168.x.000\r\n" > "s=-\r\n" > "c=IN IP4 192.168.x.000\r\n" > "t=0 0\r\n" > "*m=audio 22456 *RTP/AVP 0 8\r\n" > "m=video 51372 RTP/AVP 98 49\r\n" > "a=rtpmap:0 PCMA/8000\r\n" > "a=rtpmap:98 H263-1999/90000\r\n"; > > that is here I am mentioning that I am available on the port = *22456 , > *for receiving RTP packets. > > On the other hand from the *200 OK SDP* which I get from the *SIP > Server* I am parsing the audio port number = *18564 *which I use to send > the audio RTP packets from the Client side. > > Until here everything is fine, but when I try to bind my client to the > local > address(1.2.3.4) and port number, there are two scenarios > > 1. If I bind my client to the local port = *22456, *this is how I am > doing* **Local.sin_port = 22456**; *When I have done like this* *I cant > send anything to the SIP Server, after time out SIP Server sends BYE to > the SIP Client. > > 2. If I bind my client to the local port = *5060 (SIP PORT), > **Local.sin_port = 5060**; *When I have done like this* *I can send RTP > packets to the SIP Server and there is a constant flow of packets which > I can capture and view using Wireshark. > > For both the above cases, I am declaring the remote port for the Server > in this manner* remote.sin_port = **18564 * > > is this normal to send RTP packets from the local port = *5060(SIP > PORT)* with remote port = *18564 *and receive RTP packets from SIP > Server on local port = *22456 * with remote port = *18564. > > *I am really confused here*. *If I am doing something wrong then please > correct me*. > > *If you need any further information then please let me know. > > Regards* > * > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
