[SR-Users] Nat Detect does not work with GS Phones

[Olle E. Johansson]

> On 14 Jul 2015, at 11:56, Alberto Sagredo <alberto.sagredo at avanzada7.com> wrote:
> 
> I have found an issue detecting NAT of GS 1.4.23 Phones when using Stun on this phones
If they activate STUN they signal with a public IP. If they signal with a public IP, they tell us they 
can handle NAT by themself and require no help with NAT traversal from Kamailio. 

Turn off STUN to get help from Kamailio.

/O
> 
> Usual nat_uac_test with numbers 19 and 3 does not seems to detect is behind nat so NATMANAGE is not called
> 
> 
> Here its some trace. ANy clue how to handle this phones if they activate STUN for example
> 
> U 80.26.x.x:52768 -> 192.168.0.170:8002 <http://192.168.0.170:8002/>
> INVITE sip:2 at x.x.x.x:8002 SIP/2.0.
> 
> Via: SIP/2.0/UDP 80.26.x.x:52768;branch=z9hG4bK358742535;rport.
> 
> From: "Anonymous" <sip:anonymous at anonymous.invalid>;tag=1478444456.
> 
> To: <sip:2 at x.x.x.x:8002>.
> 
> Call-ID: 244257786-52768-56 at IA.CG.BIE.BCH.
> 
> CSeq: 550 INVITE.
> 
> Contact: "Anonymous" <sip:212 at 80.26.x.x:52768>.
> 
> X-Grandstream-PBX: true.
> 
> Max-Forwards: 70.
> 
> User-Agent: Grandstream GXP2140 1.0.4.23.
> 
> Privacy: id.
> 
> P-Preferred-Identity: <sip:212 at x.x.x.x:8002>.
> 
> Supported: replaces, path, timer.
> 
> Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE.
> 
> Content-Type: application/sdp.
> 
> Accept: application/sdp, application/dtmf-relay.
> 
> Content-Length:   335.
> 
> .
> 
> v=0.
> 
> o=212 8000 8000 IN IP4 80.26.x.x.
> 
> s=SIP Call.
> 
> c=IN IP4 80.26.x.x.
> 
> t=0 0.
> 
> m=audio 55422 RTP/AVP 0 8 18 9 2 101.
> 
> a=sendrecv.
> 
> a=rtpmap:0 PCMU/8000.
> 
> a=ptime:20.
> 
> a=rtpmap:8 PCMA/8000.
> 
> a=rtpmap:18 G729/8000.
> 
> a=fmtp:18 annexb=no.
> 
> a=rtpmap:9 G722/8000.
> 
> a=rtpmap:2 G726-32/8000.
> 
> a=rtpmap:101 telephone-event/8000.
> 
> a=fmtp:101 0-15.
> 
> 
> # Caller NAT detection route
> 
> route[NATDETECT] {
> 
> #!ifdef WITH_NAT
> 
>         force_rport();
> 
>         if (nat_uac_test("19)) {
> 
>                 if (is_method("REGISTER")) {
> 
>                         fix_nated_register();
> 
>                 } else {
> 
>                         fix_nated_contact();
> 
>                 }
> 
>                 setflag(FLT_NATS);
> 
> }
> 
> #!endif
> 
>         return;
> 
> }
> 
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