Hello,
the problem is the natbox, being a linux it implements symmetric NAT which allocates a new port for media, other than STUN returned.
To solve the problem you have to use nathelper/rtpproxy or mediaproxy on the SIP server.
Cheers, Daniel
On 09/24/05 00:23, Diego Valencia wrote:
Hi everybody, I have a "one way audio" problem. My enviroment is:
xx.xx.63.75/27 = SER xx.xx.63.68/27 = Natbox (linux iptables masquerade) xx.xx.70.2/25 = STUN server xx.xx.63.78/27 = PAP1 linksys AOR 2000 10.1.1.233/24 = PAP2 linksys AOR 2001 (behind NATbox with stun enable)
I have no audio from PAP1 to PAP2 when the call is made from PAP1 to PAP2, but when the call is made from PAP2 to PAP1 it works correctly.
I see on the natbox that the RTP packet is droped with unreachable cause (icmp messages).
This is the trace (ngrep) for the call from PAP1 to PAP2 on external interface of the natbox, where I can see STUN packets and the number udp port that the PAP willl be use (16444 to 16447). The problem is natbox use other port (1173). I don't know if this problem is on natbox or stun server or PAP. Can you helpme?
Thanks!!
U xx.xx.63.75:5060 -> xx.xx.63.68:5060 INVITE sip:2001@xx.xx.63.68:5060 SIP/2.0..Record-Route: sip:xx.xx.63.75;ftag=d1ccd3db9e31eb1fo0;lr=on..Via: SIP/2.0/UDP xx.xx.63.75;branch=z9hG4bK52fb.41985863.0..Via: SIP/2.0/UDP xx.xx.63.78:5060;branch=z9hG4bK-57b1577f..From: 2000 <sip:5 890000@xx.xx.63.75>;tag=d1ccd3db9e31eb1fo0..To mailto:890000@xx.xx.63.75%3E;tag=d1ccd3db9e31eb1fo0..To: sip:2001@xx.xx.63.75..Call-ID: d6e2df8b-5193d32f@xx.xx.63.78..CSeq mailto:d6e2df8b-5193d32f@xx.xx.63.78..CSeq: 101 INVITE..Max-Forwards: 16..Contact: 2000 sip:2000@xx.xx.63.78:5060..Expires: 240..User-Agent: Linksys/PAP2-2.0.10(L Sc)..Content-Length: 420..Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER..Supported: x-sipura..Content-Type: app lication/sdp....v=0..o=- 29375 29375 IN IP4 xx.xx.63.78..s=-..c=IN IP4 xx.xx.63.78..t=0 0..m=audio 16472 RTP/AVP 18 0 2 4 8 9 6 97 98 100 101..a=rtpmap:18 G729a/8000..a=rtpmap:0 PCMU/8000..a=rtpmap:2 G726-32/8000..a=rtpmap:4 G723/8000..a=rtpmap:8 PCMA/8 000..a=rtpmap:96 G726-40/8000..a=rtpmap:97 G726-24/8000..a=rtpmap:98 G726-16/8000..a=rtpmap:100 NSE/8000..a=rtpmap:101 telephon e-event/8000..a=fmtp:101 0-15..a=ptime:30..a=sendrecv..
# U xx.xx.63.68:5060 -> xx.xx.63.75:5060 SIP/2.0 100 Trying..To: sip:2001@xx.xx.63.75..From: 2000 sip:2000@xx.xx.63.75;tag=d1ccd3db9e31eb1fo0..Call-ID : d6e2df8b-5193d32f@xx.xx.63.78..CSeq mailto:d6e2df8b-5193d32f@xx.xx.63.78..CSeq: 101 INVITE..Via: SIP/2.0/UDP xx.xx.63.75;branch=z9hG4bK52fb.41985863.0..Via: SIP/2.0/U DP xx.xx.63.78:5060;branch=z9hG4bK-57b1577f..Record-Route: sip:xx.xx.63.75;ftag=d1ccd3db9e31eb1fo0;lr=on..Server: Linksys/P AP2-2.0.10(LSc)..Content-Length: 0....
# U xx.xx.63.68:5060 -> xx.xx.70.2:3478
.....*f..*f..*f..*f.
# U xx.xx.63.68:16444 -> xx.xx.70.2:3478
.....OB..OB..OB..OB.
# U xx.xx.63.68:16445 -> xx.xx.70.2:3478
....................
# U xx.xx.63.68:16446 -> xx.xx.70.2:3478
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# U xx.xx.63.68:16447 -> xx.xx.70.2:3478
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# U xx.xx.63.68:5060 -> xx.xx.70.2:3478
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# U xx.xx.63.68:16444 -> xx.xx.70.2:3478
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# U xx.xx.70.2:3478 -> xx.xx.63.68:5060
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# U xx.xx.63.68:16445 -> xx.xx.70.2:3478
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# U xx.xx.63.68:16446 -> xx.xx.70.2:3478
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# U xx.xx.70.2:3478 -> xx.xx.63.68:16446 ...$...&...&...&...&......@>.+?D.........+F..........+F mailto:...$...&...&...&...&......@%3E.+?D.........+F..........+F.
# U xx.xx.63.68:5060 -> xx.xx.63.75:5060 SIP/2.0 180 Ringing..To: sip:2001@xx.xx.63.75;tag=156298945b7d27i0..From: 2000 sip:2000@xx.xx.63.75;tag=d1ccd 3db9e31eb1fo0..Call-ID: d6e2df8b-5193d32f@xx.xx.63.78..CSeq mailto:d6e2df8b-5193d32f@xx.xx.63.78..CSeq: 101 INVITE..Via: SIP/2.0/UDP xx.xx.63.75;branch=z9hG4bK52fb.4198 5863.0..Via: SIP/2.0/UDP xx.xx.63.78:5060;branch=z9hG4bK-57b1577f..Record-Route: <sip:xx.xx.63.75;ftag=d1ccd3db9e31eb1fo0;lr= on>..Server: Linksys/PAP2-2.0.10(LSc)..Content-Length: 0.... # U xx.xx.70.2:3478 -> xx.xx.63.68:16444 ...$.OB..OB..OB..OB.......@<.+?D.........+F..........+F mailto:...$.OB..OB..OB..OB.......@%3C.+?D.........+F..........+F.
# U xx.xx.63.68:5060 -> xx.xx.63.75:5060 SIP/2.0 200 OK..To: sip:2001@xx.xx.63.75;tag=156298945b7d27i0..From: 2000 sip:2000@xx.xx.63.75;tag=d1ccd3db9e 31eb1fo0..Call-ID: d6e2df8b-5193d32f@xx.xx.63.78..CSeq mailto:d6e2df8b-5193d32f@xx.xx.63.78..CSeq: 101 INVITE..Via: SIP/2.0/UDP xx.xx.63.75;branch=z9hG4bK52fb.41985863. 0..Via: SIP/2.0/UDP xx.xx.63.78:5060;branch=z9hG4bK-57b1577f..Record-Route: sip:xx.xx.63.75;ftag=d1ccd3db9e31eb1fo0;lr=on.. Contact: 2001 sip:2001@xx.xx.63.68:5060..Server: Linksys/PAP2-2.0.10(LSc)..Content-Length: 236..Allow: ACK, BYE, CANCE L, INFO, INVITE, NOTIFY, OPTIONS, REFER..Supported: x-sipura..Content-Type: application/sdp....v=0..o=- 659101 659101 IN IP4 20 0.43.63.68..s=-..c=IN IP4 xx.xx.63.68..t=0 0..m=audio 16444 RTP/AVP 18 100 101..a=rtpmap:18 G729a/8000..a=rtpmap:100 NSE/8000. .a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-15..a=ptime:30..a=sendrecv..
# U xx.xx.63.75:5060 -> xx.xx.63.68:5060 ACK sip:2001@xx.xx.63.68:5060 SIP/2.0..Record-Route: sip:xx.xx.63.75;ftag=d1ccd3db9e31eb1fo0;lr=on..Via: SIP/2.0/UDP 200 .43.63.75;branch=0..Via: SIP/2.0/UDP xx.xx.63.78:5060;branch=z9hG4bK-5a4c9c84..From: 2000 sip:2000@xx.xx.63.75;tag =d1ccd3db9e31eb1fo0..To: sip:2001@xx.xx.63.75;tag=156298945b7d27i0..Call-ID: d6e2df8b-5193d32f@xx.xx.63.78..CSeq mailto:d6e2df8b-5193d32f@xx.xx.63.78..CSeq: 101 AC K..Max-Forwards: 16..Contact: 2000 sip:2000@xx.xx.63.78:5060..User-Agent: Linksys/PAP2-2.0.10(LSc)..Content-Length:
0....
# U xx.xx.63.78:16472 -> xx.xx.63.68:16444 ..8...-..L....@.....tF.34..V.|B..n..a.k(.R mailto:..8...-..L....@.....tF.34..V.%7CB..n..a.k%28.R
# I xx.xx.63.68 -> xx.xx.63.78 3:3
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# U xx.xx.63.68:1173 -> xx.xx.63.78:16472
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# U xx.xx.63.78:16472 -> xx.xx.63.68:16444 ..8......L... .s..._exR..Kc.....+.O<.RZ.O{
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# U xx.xx.63.68:1173 -> xx.xx.63.78:16472 ..!p..wi.F.!.'D.F...K....@C..e.Z.[~P...Et mailto:..%21p..wi.F.%21.%27D.F...K....@C..e.Z.%5B%7EP...Et,
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# I xx.xx.63.68 -> xx.xx.63.78 3:3
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# I xx.xx.63.68 -> xx.xx.63.78 3:3
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# U xx.xx.63.78:16472 -> xx.xx.63.68:16444
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# I xx.xx.63.68 -> xx.xx.63.78 3:3
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# U xx.xx.63.68:1173 -> xx.xx.63.78:16472 ..!s..z9.F.!0...ooPE..F. .5...E....v......
# U xx.xx.63.78:16472 -> xx.xx.63.68:16444
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# I xx.xx.63.68 -> xx.xx.63.78 3:3
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# U xx.xx.63.68:1173 -> xx.xx.63.78:16472 ..!t..{).F.!.o...{..r..3....F.$.r.. V..by.
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