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*
*
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