[Serusers] HELP: Why does SER not absorb this re-INVITE?

Java Rockx javarockx at gmail.com
Fri Mar 25 19:37:21 CET 2005


Jan,

You are indeed correct - as usual.

Last night the Sonus guys magically "fixed" this on their side.

Thanks for the help


On Fri, 25 Mar 2005 12:48:56 -0500, Jan Janak <jan at iptel.org> wrote:
> On 20-03 08:31, Java Rockx wrote:
> > Hi all.
> >
> > I have a big problem and I really need some help. re-INVITE messages
> > are not properly processed during __random__ call durations. Sometimes
> > a call can exceed 1 hour and sometimes a call is only two minutes,
> > then ser improperly processes a re-INVITE and a 408 Request Timeout is
> > sent back to the Sonus GW, which then drops the call.
> 
>   It is not ser who improperly processes the re-INVITE. SER sends 100
>   trying to the Sonus gateway and tries to deliver the re-INVITE to
>   the grandstream phone which does not send any reply so the transaction
>   times out.
> 
>   It is correct that Sonus sends a BYE after 408 becuase that is what
>   re-INVITEs in this case are for -- to detect dead user agents.
> 
>   The problemy is most likely in grandstream which does not send any
>   reply to the 2nd transaction in the log below. Note that that the
>   messages below do not belong to the same transaction, the first INVITE
>   has lower CSeq number than the second one (which times out), so there
>   are two separate transactions, the first one is ok, the 2nd times out.
> 
> > Attached is a partial call log that begins with a re-INVITE.
> >
> > NOTE: this is __NOT__ the first re-INVITE of this call. This call
> > lasted more than 30 minutes and re-INVITEs were sent on a 2 minute
> > interval.
> >
> > Anyhow, the re-INVITE is processed and the SIP phone ACKed it, however
> > another re-INVITE got sent from the Sonus GW which ser incorrectly
> > tried to send to the SIP UA.
> 
>   It is correct, the 2nd re-INVITE is a new transaction and thus gets
>   processed exactly as the first one.
> 
> >The SIP UA correctly ignored the
> > re-INVITE since it just ACKed it.
> 
>   That is incorrect, the SIP UA should not ignore it, see the cseq
>   number (it differs).
> 
> > SER retransmits the re-INVITE to the SIP UA until the fr_invite timer
> > expires, then it sends a 408 Request Timeout back to the Sonus GW,
> > which then disconnects the call and sends ser a BYE message.
> >
> > Is this a bug in the ser TM module?
> 
>   No.
> 
> > Shouldn't ser just absorb the
> > re-INVITE since it just ACKed it rather than trying to send the
> > re-INVITE to the SIP UA?
> >
> > The Sonus guys say that this is an error in the ser SIP stack.
> 
>   The Sonus guys always say that and mostly they are wrong.
> 
>    Jan.
> 
> > Please help. I'm really stuck with this one.
> >
> > Regards,
> > Paul
> 
> > U 2005/03/19 11:12:00.975247 216.229.127.60:5060 -> 10.3.0.221:5060
> > INVITE sip:3212514236 at 66.90.50.230:5060;user=phone SIP/2.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bKf7bde5e04ab-d8ee8ecc.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023478189c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14918 INVITE.
> > Max-Forwards: 69.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Route: <sip:10.3.0.221:5060;ftag=7c0456c2c49ed845;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 248.
> > .
> > v=0.
> > o=Sonus_UAC 3174 11674 IN IP4 216.229.118.76.
> > s=SIP Media Capabilities.
> > c=IN IP4 216.229.118.101.
> > t=0 0.
> > m=audio 17812 RTP/AVP 18 101.
> > a=rtpmap:18 G729/8000.
> > a=fmtp:18 annexb=no.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-15.
> > a=sendrecv.
> >
> > #
> > U 2005/03/19 11:12:00.978029 10.3.0.221:5060 -> 216.229.127.60:5060
> > SIP/2.0 100 trying -- your call is important to us.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bKf7bde5e04ab-d8ee8ecc.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023478189c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14918 INVITE.
> > Content-Length: 0.
> > .
> >
> > #
> > U 2005/03/19 11:12:00.978139 10.3.0.221:5060 -> 66.90.50.230:5060
> > INVITE sip:3212514236 at 66.90.50.230;user=phone SIP/2.0.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK6095.c5e65715.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bKf7bde5e04ab-d8ee8ecc.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023478189c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14918 INVITE.
> > Max-Forwards: 16.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 243.
> > P-hint: Loose_Route.
> > P-hint: NATed re-INVITE.
> > .
> > v=0.
> > o=Sonus_UAC 3174 11674 IN IP4 216.229.118.76.
> > s=SIP Media Capabilities.
> > c=IN IP4 10.3.0.221.
> > t=0 0.
> > m=audio 35366 RTP/AVP 18 101.
> > a=rtpmap:18 G729/8000.
> > a=fmtp:18 annexb=no.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-15.
> > a=sendrecv.
> >
> > #
> > U 2005/03/19 11:12:01.191163 66.90.50.230:5060 -> 10.3.0.221:5060
> > SIP/2.0 200 OK.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK6095.c5e65715.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bKf7bde5e04ab-d8ee8ecc.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023478189c606358.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14918 INVITE.
> > User-Agent: Grandstream BT100 1.0.5.22.
> > Contact: <sip:3212514236 at 172.16.1.18;user=phone>.
> > Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
> > Content-Type: application/sdp.
> > Supported: replaces.
> > Content-Length: 217.
> > .
> > v=0.
> > o=3212514236 8000 8020 IN IP4 172.16.1.18.
> > s=SIP Call.
> > c=IN IP4 172.16.1.18.
> > t=0 0.
> > m=audio 5004 RTP/AVP 18 101.
> > a=sendrecv.
> > a=rtpmap:18 G729/8000.
> > a=ptime:20.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-11.
> >
> > #
> > U 2005/03/19 11:12:01.193221 10.3.0.221:5060 -> 216.229.127.60:5060
> > SIP/2.0 200 OK.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bKf7bde5e04ab-d8ee8ecc.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023478189c606358.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14918 INVITE.
> > User-Agent: Grandstream BT100 1.0.5.22.
> > Contact: <sip:3212514236 at 66.90.50.230:5060;user=phone>.
> > Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE.
> > Content-Type: application/sdp.
> > Supported: replaces.
> > Content-Length: 217.
> > P-hint: NATed Reply.
> > .
> > v=0.
> > o=3212514236 8000 8020 IN IP4 172.16.1.18.
> > s=SIP Call.
> > c=IN IP4 10.3.0.221.
> > t=0 0.
> > m=audio 35366 RTP/AVP 18 101.
> > a=sendrecv.
> > a=rtpmap:18 G729/8000.
> > a=ptime:20.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-11.
> >
> > #
> > U 2005/03/19 11:12:01.271300 216.229.127.60:5060 -> 10.3.0.221:5060
> > ACK sip:3212514236 at 66.90.50.230:5060;user=phone SIP/2.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK023478189c606358.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023478189c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14918 ACK.
> > Max-Forwards: 69.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Route: <sip:10.3.0.221:5060;ftag=7c0456c2c49ed845;lr>.
> > Content-Length: 0.
> > .
> >
> > #
> > U 2005/03/19 11:12:01.271682 10.3.0.221:5060 -> 66.90.50.230:5060
> > ACK sip:3212514236 at 66.90.50.230:5060;user=phone SIP/2.0.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK023478189c606358.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023478189c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14918 ACK.
> > Max-Forwards: 16.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Content-Length: 0.
> > P-hint: Loose_Route.
> > .
> >
> > ########################################################################################################
> > U 2005/03/19 11:14:01.299130 216.229.127.60:5060 -> 10.3.0.221:5060
> > INVITE sip:3212514236 at 66.90.50.230:5060;user=phone SIP/2.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK948d9f13945-93eca6cd.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023564be9c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14919 INVITE.
> > Max-Forwards: 69.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Route: <sip:10.3.0.221:5060;ftag=7c0456c2c49ed845;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 248.
> > .
> > v=0.
> > o=Sonus_UAC 3174 11674 IN IP4 216.229.118.76.
> > s=SIP Media Capabilities.
> > c=IN IP4 216.229.118.101.
> > t=0 0.
> > m=audio 17812 RTP/AVP 18 101.
> > a=rtpmap:18 G729/8000.
> > a=fmtp:18 annexb=no.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-15.
> > a=sendrecv.
> >
> > #
> > U 2005/03/19 11:14:01.301186 10.3.0.221:5060 -> 216.229.127.60:5060
> > SIP/2.0 100 trying -- your call is important to us.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK948d9f13945-93eca6cd.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023564be9c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14919 INVITE.
> > Content-Length: 0.
> > .
> >
> > #
> > U 2005/03/19 11:14:01.301327 10.3.0.221:5060 -> 66.90.50.230:5060
> > INVITE sip:3212514236 at 66.90.50.230;user=phone SIP/2.0.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK5095.9db7d786.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK948d9f13945-93eca6cd.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023564be9c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14919 INVITE.
> > Max-Forwards: 16.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 243.
> > P-hint: Loose_Route.
> > P-hint: NATed re-INVITE.
> > .
> > v=0.
> > o=Sonus_UAC 3174 11674 IN IP4 216.229.118.76.
> > s=SIP Media Capabilities.
> > c=IN IP4 10.3.0.221.
> > t=0 0.
> > m=audio 35366 RTP/AVP 18 101.
> > a=rtpmap:18 G729/8000.
> > a=fmtp:18 annexb=no.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-15.
> > a=sendrecv.
> >
> > #
> > U 2005/03/19 11:14:01.416042 10.3.0.221:5060 -> 66.90.50.230:5060
> > INVITE sip:3212514236 at 66.90.50.230;user=phone SIP/2.0.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK5095.9db7d786.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK948d9f13945-93eca6cd.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023564be9c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14919 INVITE.
> > Max-Forwards: 16.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 243.
> > P-hint: Loose_Route.
> > P-hint: NATed re-INVITE.
> > .
> > v=0.
> > o=Sonus_UAC 3174 11674 IN IP4 216.229.118.76.
> > s=SIP Media Capabilities.
> > c=IN IP4 10.3.0.221.
> > t=0 0.
> > m=audio 35366 RTP/AVP 18 101.
> > a=rtpmap:18 G729/8000.
> > a=fmtp:18 annexb=no.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-15.
> > a=sendrecv.
> >
> > #
> > U 2005/03/19 11:14:03.436047 10.3.0.221:5060 -> 66.90.50.230:5060
> > INVITE sip:3212514236 at 66.90.50.230;user=phone SIP/2.0.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK5095.9db7d786.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK948d9f13945-93eca6cd.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023564be9c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14919 INVITE.
> > Max-Forwards: 16.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 243.
> > P-hint: Loose_Route.
> > P-hint: NATed re-INVITE.
> > .
> > v=0.
> > o=Sonus_UAC 3174 11674 IN IP4 216.229.118.76.
> > s=SIP Media Capabilities.
> > c=IN IP4 10.3.0.221.
> > t=0 0.
> > m=audio 35366 RTP/AVP 18 101.
> > a=rtpmap:18 G729/8000.
> > a=fmtp:18 annexb=no.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-15.
> > a=sendrecv.
> >
> > ##
> > U 2005/03/19 11:14:07.476044 10.3.0.221:5060 -> 66.90.50.230:5060
> > INVITE sip:3212514236 at 66.90.50.230;user=phone SIP/2.0.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK5095.9db7d786.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK948d9f13945-93eca6cd.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023564be9c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14919 INVITE.
> > Max-Forwards: 16.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 243.
> > P-hint: Loose_Route.
> > P-hint: NATed re-INVITE.
> > .
> > v=0.
> > o=Sonus_UAC 3174 11674 IN IP4 216.229.118.76.
> > s=SIP Media Capabilities.
> > c=IN IP4 10.3.0.221.
> > t=0 0.
> > m=audio 35366 RTP/AVP 18 101.
> > a=rtpmap:18 G729/8000.
> > a=fmtp:18 annexb=no.
> > a=rtpmap:101 telephone-event/8000.
> > a=fmtp:101 0-15.
> > a=sendrecv.
> >
> > #
> > U 2005/03/19 11:14:11.516074 10.3.0.221:5060 -> 66.90.50.230:5060
> > INVITE sip:3212514236 at 66.90.50.230;user=phone SIP/2.0.
> > Record-Route: <sip:10.3.0.221;ftag=0b845f52;lr>.
> > Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK5095.9db7d786.0.
> > Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK948d9f13945-93eca6cd.
> > Via: SIP/2.0/UDP 216.229.118.76:4060;branch=z9hG4bK023564be9c606358.
> > To: "Paul Hazlett" <sip:3212514236 at 216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
> > From: <sip:4075660914 at sip.mycompany.com;user=phone>;tag=0b845f52.
> > Call-ID: fc2e388f89db4205 at 172.16.1.18.
> > CSeq: 14919 INVITE.
> > Max-Forwards: 16.
> > Contact: sip:4075660914 at 216.229.118.76:4060.
> > Record-Route: <sip:216.229.127.60:5060;lr>.
> > Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, PRACK, INFO.
> > Accept: multipart/mixed, application/sdp, application/isup, application/dtmf, application/dtmf-relay.
> > Supported: timer.
> > Session-Expires: 240;refresher=uac.
> > Content-Disposition: session;handling=required.
> > Content-Type: application/sdp.
> > Content-Length: 243.
> > P-hint: Loose_Route.
> 
>




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