[OpenSER-Users] INVITE relayed with missing bytes

Tue Oct 23 16:42:43 CEST 2007

Hi Georgios,

The ngrep will show you only the first UDP packet (that's why you see
the truncated SIP message).
Do a full tcpdump (with -w option) and open the captured file with wireshark.
Wireshark will reassemble the packets.

Now you need to check on the other end that the fragments are received
and reassembled properly.

Regards,
Ovidiu Sas

On 10/23/07, Papadopoulos Georgios <geop at altectelecoms.gr> wrote:
>
> Hi Ovidiu,
>
> So you are saying that despite ngrep does not show it, the whole packet
> is correctly sent?
>
> thank you
>
> George
>
> > -----Original Message-----
> > From: Ovidiu Sas [mailto:sip.nslu at gmail.com]
> > Sent: Tuesday, October 23, 2007 5:23 PM
> > To: Papadopoulos Georgios
> > Cc: users at openser.org
> > Subject: Re: [OpenSER-Users] INVITE relayed with missing bytes
> >
> > Hi Georgios,
> >
> > It seems that your packet is to big and it was fragmented
> > (udp fragmentation).
> > OpenSER is able to deal with fragmented packets (both sending
> > and receiving).
> >
> >
> > Regards,
> > Ovidiu Sas
> >
> > On 10/23/07, Papadopoulos Georgios <geop at altectelecoms.gr> wrote:
> > >
> > >
> > > Hello all,
> > >
> > > I am noticing that OpenSER relays an INVITE and the packet that is
> > > sent out is clipped. You can see in the following packets that the
> > > forwarded packet is missing a few bytes from the SDP part. Counting
> > > the bytes shows that the outgoing packet is always 1512
> > bytes. Is this
> > > something that has do with OpenSER (module parameter,
> > compile options) or is it OS related?
> > >
> > > thank you for any help
> > >
> > > George
> > >
> > >
> > >
> > > U 2007/10/23 13:27:46.165232 213.5.1.6:57665 ->
> > 213.5.43.4:5060 INVITE
> > > sip:1012118204501 at 213.5.43.4:5060 SIP/2.0.
> > > Via: SIP/2.0/UDP
> > >
> > 213.5.1.6:5060;x-route-tag="cid:CID-ACN-3 at 213.5.1.6";branch=z9
> > hG4bK1594C1AB9.
> > > Remote-Party-ID: "GEOP Papadopoul"
> > > <sip:2116872933 at 213.5.1.6>;party=calling;screen=no;privacy=off.
> > > From: "GEOP Papadopoul"
> > <sip:2116872933 at 213.5.1.6>;tag=237E8130-1821.
> > > To: <sip:1012118204501 at 213.5.43.4>.
> > > Date: Tue, 23 Oct 2007 10:27:46 GMT.
> > > Call-ID: 6E2DF805-808911DC-AA258232-F1669B65 at 213.5.1.6.
> > > Supported: 100rel,timer,resource-priority,replaces.
> > > Min-SE:  1800.
> > > Cisco-Guid: 1848010793-2156466652-3218142496-4228086245.
> > > User-Agent: Cisco-SIPGateway/IOS-12.x.
> > > Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER,
> > > SUBSCRIBE, NOTIFY, INFO, REGISTER.
> > > CSeq: 101 INVITE.
> > > Max-Forwards: 70.
> > > Timestamp: 1193135266.
> > > Contact: <sip:2116872933 at 213.5.1.6:5060>.
> > > Call-Info:
> > >
> > <sip:213.5.1.6:5060>;method="NOTIFY;Event=telephone-event;Dura
> > tion=2000".
> > > Expires: 180.
> > > Allow-Events: telephone-event.
> > > Content-Type: application/sdp.
> > > Content-Disposition: session;handling=required.
> > > Content-Length: 290.
> > > .
> > > v=0.
> > > o=CiscoSystemsSIP-GW-UserAgent 5211 453 IN IP4 213.5.1.6.
> > > s=SIP Call.
> > > c=IN IP4 213.5.1.6.
> > > t=0 0.
> > > m=audio 16454 RTP/AVP 18 0 8 100.
> > > c=IN IP4 213.5.1.6.
> > > a=rtpmap:18 G729/8000.
> > > a=fmtp:18 annexb=yes.
> > > a=rtpmap:0 PCMU/8000.
> > > a=rtpmap:8 PCMA/8000.
> > > a=rtpmap:100 X-NSE/8000.
> > > a=fmtp:100 192-194.
> > >
> > >
> > > U 2007/10/23 13:27:46.173826 213.5.43.4:5060 -> 213.5.1.6:57665
> > > SIP/2.0 100 Giving a try.
> > > Via: SIP/2.0/UDP
> > >
> > 213.5.1.6:5060;x-route-tag="cid:CID-ACN-3 at 213.5.1.6";branch=z9
> > hG4bK1594C1AB9;rport=57665.
> > > From: "GEOP Papadopoul"
> > <sip:2116872933 at 213.5.1.6>;tag=237E8130-1821.
> > > To: <sip:1012118204501 at 213.5.43.4>.
> > > Call-ID: 6E2DF805-808911DC-AA258232-F1669B65 at 213.5.1.6.
> > > CSeq: 101 INVITE.
> > > Server: Altec Telecoms SIP Proxy.
> > > Content-Length: 0.
> > > .
> > >
> > >
> > > U 2007/10/23 13:27:46.174241 213.5.43.4:5060 -> 213.5.17.226:5060
> > > INVITE sip:demo1 at 192.168.1.39:5060 SIP/2.0.
> > > Record-Route: <sip:213.5.43.4;lr=on;ftag=237E8130-1821>.
> > > Via: SIP/2.0/UDP 213.5.43.4;branch=z9hG4bK4acd.5092baa7.0.
> > > Via: SIP/2.0/UDP
> > >
> > 213.5.1.6:5060;rport=57665;x-route-tag="cid:CID-ACN-3 at 213.5.1.
> > 6";branch=z9hG4bK1594C1AB9.
> > > Remote-Party-ID: "GEOP Papadopoul"
> > > <sip:2116872933 at 213.5.1.6>;party=calling;screen=no;privacy=off.
> > > From: "GEOP Papadopoul"
> > <sip:2116872933 at 213.5.1.6>;tag=237E8130-1821.
> > > To: <sip:1012118204501 at 213.5.43.4>.
> > > Date: Tue, 23 Oct 2007 10:27:46 GMT.
> > > Call-ID: 6E2DF805-808911DC-AA258232-F1669B65 at 213.5.1.6.
> > > Supported: 100rel,timer,resource-priority,replaces.
> > > Min-SE:  1800.
> > > Cisco-Guid: 1848010793-2156466652-3218142496-4228086245.
> > > User-Agent: Cisco-SIPGateway/IOS-12.x.
> > > Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER,
> > > SUBSCRIBE, NOTIFY, INFO, REGISTER.
> > > CSeq: 101 INVITE.
> > > Max-Forwards: 10.
> > > Timestamp: 1193135266.
> > > Contact: <sip:2116872933 at 213.5.1.6:57665>.
> > > Call-Info:
> > >
> > <sip:213.5.1.6:5060>;method="NOTIFY;Event=telephone-event;Dura
> > tion=2000".
> > > Expires: 180.
> > > Allow-Events: telephone-event.
> > > Content-Type: application/sdp.
> > > Content-Disposition: session;handling=required.
> > > Content-Length: 290.
> > > P-hint: NATed client request.
> > > .
> > > v=0.
> > > o=CiscoSystemsSIP-GW-UserAgent 5211 453 IN IP4 213.5.1.6.
> > > s=SIP Call.
> > > c=IN IP4 213.5.1.6.
> > > t=0 0.
> > > m=audio 16454 RTP/AVP 18 0 8 100.
> > > c=IN IP4 213.5.1.6.
> > > a=rtpmap:18 G729/8000.
> > > a=fmtp:18 annexb=yes.
> > > a=rtpmap:0 PCMU/8000.
> > > a=rtpmap:8 PCMA/8000.
> > > a=rtpmap:100 X-NSE/8000.
> > > a=fmtp:100
> > >
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