[Users] Random error with NAT (error in 'c field')

Bogdan-Andrei Iancu bogdan at voice-system.ro
Tue Apr 11 15:53:04 CEST 2006


Hi Bruno,

do you have any errors in logs?

regards,
bogdan

Bruno Machado wrote:

> Hi fellows
>
>     Our system is showing an anormal behavior. Sometimes, our clients 
> devices behind NAT cannot obtain successfuls call to other device. 
> Take a look at the SDP headers below. These 2 dumps were made between 
> SIP Proxy and client (at private IP 192.168.0.13). Notice that the 'c 
> field' is differente between them. The first SDP has the public 
> address from RTPProxy (X.Y.Z.A). This call is a example of a perfect 
> situation. The SDP below that shows the 'c field' with a private 
> address. When the call is established, the RTP from my phone is sent 
> to this private IP, 192.168.0.13, in our LAN.
>
>     All the sinalization is sent among the 2 devices and SIP Proxy 
> normally.
>
>     When the 'openser' process is restarted, the calls flows without 
> any problems.
>
>     Somebody knows what can be happen?
>
>
>     Thanks in advance
>
>     Bruno Machado
>
>
> ..................
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE
> Content-Type: application/sdp
> Content-Length: 402
> P-hint: usrloc applied
> P-hint: nat-p2p
> v=0
> o=11000600 8000 8002 IN IP4 192.168.0.13
> s=SIP Call
> c=IN IP4 X.Y.Z.A..t=0 0
> m=audio 56304 RTP/AVP 18 4 0 8 2 99 101
> a=sendrecv
> a=rtpmap:18 G729/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:0 PCMU/8000
> ...................
>
>
> INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE
> Content-Type: application/sdp
> Content-Length: 381
> P-hint: usrloc applied
> P-hint: nat-p2p
> v=0
> o=11000600 8000 8002 IN IP4 192.168.0.13
> s=SIPCall
> c=IN IP4 192.168.0.13
> t=0 0
> m=audio 5004 RTP/AVP 18 4 0 8 2 99 101
> a=sendrecv
> a=rtpmap:18 G729/8000
> a=rtpmap:4 G723/8000
> a=rtpmap:0 PCMU/8000..a=rtpmap:8
> .......................
>
>
>
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