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

25 Mar 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 &lt;jan(a)iptel.org&gt; 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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14918 INVITE.
 Max-Forwards: 69.
 Contact: sip:4075660914@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14918 INVITE.
 Max-Forwards: 16.
 Contact: sip:4075660914@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@sip.mycompany.com;user=phone>;tag=0b845f52.
 To: "Paul Hazlett"
<sip:3212514236@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14918 INVITE.
 User-Agent: Grandstream BT100 1.0.5.22.
 Contact: <sip:3212514236@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@sip.mycompany.com;user=phone>;tag=0b845f52.
 To: "Paul Hazlett"
<sip:3212514236@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14918 INVITE.
 User-Agent: Grandstream BT100 1.0.5.22.
 Contact: <sip:3212514236@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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14919 INVITE.
 Max-Forwards: 69.
 Contact: sip:4075660914@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14919 INVITE.
 Max-Forwards: 16.
 Contact: sip:4075660914@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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14919 INVITE.
 Max-Forwards: 16.
 Contact: sip:4075660914@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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14919 INVITE.
 Max-Forwards: 16.
 Contact: sip:4075660914@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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14919 INVITE.
 Max-Forwards: 16.
 Contact: sip:4075660914@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@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@216.229.127.60;user=phone>;tag=7c0456c2c49ed845.
 From: <sip:4075660914@sip.mycompany.com;user=phone>;tag=0b845f52.
 Call-ID: fc2e388f89db4205(a)172.16.1.18.
 CSeq: 14919 INVITE.
 Max-Forwards: 16.
 Contact: sip:4075660914@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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Re: [Serusers] HELP: Why does SER not absorb this re-INVITE?