[Serusers] Problem with sl_send_reply: I won't send a reply for ACK.

[Greger V. Teigre]

The error you get is because you try to reply to it using sl_reply in 
your script. Which if test in your script does it match? The ACK has 
Route header, will be caught by if(loose_route()) and should just be 
t_relayed.
g-)

Ricardo Martinez wrote:
>
> Hello list.
>         I'm facing a problem with a UAC and i was hoping that someone 
> can give me a hand here.
>         I have a IP Phone calling to a PSTN number through SER and 
> then a GW.
>
>         10.0.0.243 : IP Phone
>         10.0.0.246 : SER SIP Proxy
>         10.0.0.239 : GW SIP PSTN
>
> When the call is established and the "200 - OK" message arrives from 
> the GW to the Proxy,  the proxy re-route the message back to the 
> Client, and finally the client respond with an ACK.
>
> Here is when te problem begins, i'm not sure if the ACK is the problem 
> or maybe is a bug with my SER box.  I'm using the Getting Started 
> ser.cfg from iptel.org.
>
> You can see the debug here:
>
> U 10.0.0.239:5060 -> 10.0.0.246:5060
> SIP/2.0 200 OK.
> Via: SIP/2.0/UDP 10.0.0.246;branch=z9hG4bK34e7.0648f244.0.
> Via: SIP/2.0/UDP 10.0.0.243:5060;rport=5060;branch=z9hG4bK407006395.
> From: <sip:5501234567 at sipvoiss.desa.mydomain.net>;tag=139103625.
> To: <sip:0101005622408196 at sipvoiss.desa.mydomain.net>;tag=d745f073a4.
> Call-ID: 90212623 at 10.0.0.243.
> CSeq: 21 INVITE.
> Supported: timer, replaces, early-session.
> User-Agent: A SIP Gateway.
> Contact: sip:005622408196 at 10.0.0.239.
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE, REFER, NOTIFY, INFO.
> Content-Type: application/sdp.
> Content-Length: 247.
> Record-Route: <sip:10.0.0.246;ftag=139103625;lr=on>.
> .
> v=0.
> o=005622408196 1170173661 1170173661 IN IP4 10.0.0.239.
> s=A Gateway SDP.
> c=IN IP4 10.0.0.239.
> t=1170173661 0.
> m=audio 23614 RTP/AVP 18 101.
> a=rtpmap:18 G729/8000/1.
> a=rtpmap:101 telephone-event/8000/1.
> a=fmtp:101 0-15.
> a=ptime:20.
>
>
> U 10.0.0.246:5060 -> 10.0.0.243:5060
> SIP/2.0 200 OK.
> Via: SIP/2.0/UDP 10.0.0.243:5060;rport=5060;branch=z9hG4bK407006395.
> From: <sip:5501234567 at sipvoiss.desa.mydomain.net>;tag=139103625.
> To: <sip:0101005622408196 at sipvoiss.desa.mydomain.net>;tag=d745f073a4.
> Call-ID: 90212623 at 10.0.0.243.
> CSeq: 21 INVITE.
> Supported: timer, replaces, early-session.
> User-Agent: A SIP Gateway.
> Contact: sip:005622408196 at 10.0.0.239.
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE, REFER, NOTIFY, INFO.
> Content-Type: application/sdp.
> Content-Length: 247.
> Record-Route: <sip:10.0.0.246;ftag=139103625;lr=on>.
> .
> v=0.
> o=005622408196 1170173661 1170173661 IN IP4 10.0.0.239.
> s=A Gateway SDP.
> c=IN IP4 10.0.0.239.
> t=1170173661 0.
> m=audio 23614 RTP/AVP 18 101.
> a=rtpmap:18 G729/8000/1.
> a=rtpmap:101 telephone-event/8000/1.
> a=fmtp:101 0-15.
> a=ptime:20.
>
>
> U 10.0.0.243:5060 -> 10.0.0.246:5060
> ACK sip:0101005622408196 at sipvoiss.desa.mydomain.net SIP/2.0.
> Via: SIP/2.0/UDP 10.0.0.243:5060;rport;branch=z9hG4bK1227697472.
> Route: <sip:10.0.0.246;ftag=139103625;lr=on>.
> From: <sip:5501234567 at sipvoiss.desa.mydomain.net>;tag=139103625.
> To: <sip:0101005622408196 at sipvoiss.desa.mydomain.net>;tag=d745f073a4.
> Call-ID: 90212623 at 10.0.0.243.
> CSeq: 21 ACK.
> Contact: <sip:5501234567 at 10.0.0.243:5060>.
> Max-Forwards: 70.
> User-Agent: S SIP User Agent / 1.10.
> Content-Length: 0.
> .
>
> Is this ACK ok?.  The ACK hits the "Sanity Checks" (Max Forwards) and 
> then breaks sending to console : "Warning: sl_send_reply: I won't send 
> a reply for ACK!!"
>
> I was reading the RFC3261 because i'm not sure about the R-URI from 
> this endpoint.  Let me explain :
>
> RFC3261 : Section 12.1.2
>
>    The route set MUST be set to the list of URIs in the Record-Route
>    header field from the response, taken in reverse order and preserving
>    all URI parameters.  If no Record-Route header field is present in
>    the response, the route set MUST be set to the empty set.  This route
>    set, even if empty, overrides any pre-existing route set for future
>    requests in this dialog. * The remote target MUST be set to the URI*
> *   from the Contact header field of the response.*
>
> So, if this is correct the R-URI from the ACk must be set to 
> sip:005622408196 at 10.0.0.239, and not the 
> sip:0101005622408196 at sipvoiss.desa.mydomain.net.
>
> Is this ok?.
> I think this is causing the ACK problem in my SER box.
>
> Can someone help me here?
> Thanks in advance.
>
> Best Regards,
> Ricardo Martinez.-
>
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>
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