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

[Bruno Machado]

Hi Bogdan
 
 The first SIP message is from call that WORKS perfectly: the "c header" has a valid IP that handle the media. Below it, we have the message with wrong "c header": there is an invalid IP. This way, the media isnt sent to the media proxy. 
 
 I did this dumps in the SIP PROXY. The only way to correct the situation is rebooting the openser. By the way: I dont change anything in the script to make it works.
 
 Best regards
 
 Bruno Machado
 
 
 U IP_My_Proxy:5060 -> 200.171.160.13:5060
 INVITE sip:11000606 at 200.171.160.13:5060 SIP/2.0
 Record-Route: <sip:IP_My_Proxy;ftag=ad50ff6e6fb26e6e;lr=on>
 Via: SIP/2.0/UDP IP_My_Proxy;branch=z9hG4bKa079.9071d6a5.0
 Via: SIP/2.0/UDP 192.168.88.101;rport=57157;received=200.216.162.18;branch=z9hG4bK9771e2044f41cee3
 From: "Alexandre BT100" <sip:24005110 at myproxy>;tag=ad50ff6e6fb26e6e
 To: <sip:11000606 at myproxy>
 Contact:<sip:24005110 at 200.216.162.18:57157>
 Supported: replaces
 Proxy-Authorization: Digest username="24005110", realm="myproxy",
 algorithm=MD5, uri="sip:11000606 at myproxy",
 nonce="44510d68180175d68510d001330893f695eadd50", response="ed83c6657bc59f00635361215d1b8b93"..Call-ID:
 db5d8eb678f6c018 at 192.168.88.101
 CSeq: 55645 INVITE
 User-Agent: Grandstream BT110 1.0.8.16
 Max-Forwards: 70
 Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE
 Content-Type: application/sdp
 Content-Length: 429
 P-hint: usrloc applied
 P-hint: nat-p2p
 
 v=0
 o=24005110 8000 8001 IN IP4 192.168.88.101
 s=SIP Call
 c=IN IP4 myproxy
 t=0 0
 m=audio 64344 RTP/AVP 18 4 0 8 2 99 9
 101
 a=sendrecv
 a=rtpmap:18 G729/8000
 a=rtpmap:4 G723/8000
 a=rtpmap:0 PCMU/8000
 a=rtpmap:8 PCMA/8000
 a=rtpmap:2 G726-32/8000
 a=rtpmap:99 iLBC/8000
 a=fmtp:99 mode=20
 a=rtpmap:9 G722/16000
 a=ptime:20
 a=rtpmap:101
 telephone-event/8000
 a=fmtp:1010-11
 a=direction:active
 a=nortpproxy:yes
 
 
 
 U IP_My_Proxy:5060 -> 200.171.160.13:5060
 INVITE sip:11000606 at 200.171.160.13:5060 SIP/2.0
 Record-Route: <sip:IP_My_Proxy;ftag=da3a34829a170ace;lr=on>
 Via: SIP/2.0/UDP IP_My_Proxy;branch=z9hG4bKd6cc.be1fc1f4.0
 Via: SIP/2.0/UDP 192.168.88.101;rport=57157;received=200.216.162.18;branch=z9hG4bK019a1f171ca1bf14
 From: "Alexandre BT100" <sip:24005110 at myproxy>;tag=da3a34829a170ace
 To: <sip:11000606 at myproxy>
 Contact: <sip:24005110 at 200.216.162.18:57157>
 Supported: replaces
 Proxy-Authorization: Digest username="24005110", realm="myproxy",
 algorithm=MD5, uri="sip:11000606 at myproxy",
 nonce="44510c217bc74fe6e203d22c12c3863536776e75", response="c403be69f25add894daeccd2a29bf0e4"
 Call-ID: 57efde4d3bb5a88f at 192.168.88.101
 CSeq: 5727 INVITE
 User-Agent: Grandstream
 BT110 1.0.8.16
 Max-Forwards: 70
 Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE
 Content-Type: application/sdp
 Content-Length: 410
 P-hint: usrloc applied
 P-hint: nat-p2p
 
 v=0
 o=24005110 8000 8001 IN IP4 192.168.88.101
 s=SIP Call
 c=IN IP4 192.168.88.101
 t=0 0
 m=audio 5004 RTP/AVP 18 4 0 8 2 99 9 101
 a=sendrecv
 a=rtpmap:18 G729/8000
 a=rtpmap:4 G723/8000
 a=rtpmap:0 PCMU/8000
 a=rtpmap:8 PCMA/8000
 a=rtpmap:2 G726-32/8000
 a=rtpmap:99 iLBC/8000
 a=fmtp:99 mode=20
 a=rtpmap:9 G722/16000
 a=ptime:20
 a=rtpmap:101 telephone-event/8000
 a=fmtp:101 0-11
 a=direction:active
 
		
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