I use the captagent with tcpdefrag on, the full message is this:

INVITE sip:xxxxx00000000xx@10.x.x.x:5060;alias=10.x.x.x~5060~1 SIP/2.0.
Record-Route: sip:mt@10.x.x.x;lr=on;ftag=989164876;did=34f.4102.
Route: sip:term@pcscf1.ims.mncxxx.mccxxx.3gppnetwork.org:5060;nat=yes;received=sip:10.x.x.x:5060;lr.
Record-Route: sip:mo@10.x.x.x;lr=on;ftag=989164876;did=34f.4102.
Record-Route: sip:mo@10.x.x.x;lr=on;ftag=989164876;did=34f.4102.
Record-Route: sip:mo@10.x.x.x;lr=on;ftag=989164876;did=34f.4102.
Record-Route: sip:mo@10.x.x.x;r2=on;lr=on;ftag=989164876;nat=yes;did=34f.63a1.
Record-Route: sip:mo@x.x.x.x;transport=tcp;r2=on;lr=on;ftag=989164876;nat=yes;did=34f.63a1.
Supported: timer,100rel,histinfo.
Allow: INVITE,ACK,OPTIONS,CANCEL,BYE,UPDATE,INFO,REFER,NOTIFY,MESSAGE,PRACK.
User-Agent: SLICK IMS 4.0.0.
Accept-Contact: *;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";video.
P-Access-Network-Info: 3GPP-E-UTRAN-FDD;utran-cell-id-3gpp=xxxxx0001003exxx.
Session-Expires: 90;refresher=uac.
Min-SE: 90.
Content-Type: application/sdp.
From: sip:xxxxxxxxxxxx@ims.mncxxx.mccxxx.3gppnetwork.org;tag=989164876.
To: sip:xxxxxxxxxxxx;phone-context=ims.mncxxx.mccxxx.3gppnetwork.org@ims.mncxxx.mccxxx.3gppnetwork.org;user=phone.
Call-ID: 3450437327@10.x.x.x.
CSeq: 1 INVITE.
Max-Forwards: 62.
Contact: sip:xxxxxxxxxxxx@10.x.x.x:5060;alias=10.x.x.x~60911~2;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";video;+sip.instance="urn:gsma:imei:xxxxxxxx-366xxx-0".
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.9efd9ce385fb13f74a5c5c05297259de.0.
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.107170e92de6f030e36152a16765d6f2.1.
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.bd4c16c8762c5d272df661535d90582b.0.
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.1281fe88ecb5727ef9c6ffa477d8d767.0.
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.7d1a7a52f59ce8183dc2caf395526087.0.
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.5e05862dc0ba03d6e267df36fc2d9df1.0.
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.f94b72d4e2f2ced2dac00f9989579d93.0.
Via: SIP/2.0/UDP 10.x.x.x;branch=z9hG4bKa7fa.3ee4edab07004b5c1244ea2de9334ea9.0;i=5.
Via: SIP/2.0/TCP 10.x.x.x:5060;received=10.x.x.x;branch=z9hG4bK312549297smg;transport=TCP;rport=60911.
Content-Length: 474.
P-Asserted-Identity: sip:xxxxxxxxxxxx@ims.mncxxx.mccxxx.3gppnetwork.org.
X-RTP: mo.
.
v=0.
o=SAMSUNG-IMS-UE 12345629 0 IN IP4 x.x.x.x.
s=SS VOIP.
i=A VOIP Session.
c=IN IP4 x.x.x.x.
t=0 0.
m=audio 30708 RTP/AVP 107 96 110.
b=AS:38.
b=RS:375.
b=RR:1125.
a=rtpmap:107 AMR-WB/16000/1.
a=fmtp:107 octet-align=1;mode-set=2;mode-change-capability=2;max-red=220.
a=rtpmap:96 ---- the message is cut here in homer database ----- AMR/8000/1.
a=fmtp:96 octet-align=1;mode-change-capability=2;max-red=220.
a=rtpmap:110 telephone-event/8000.
a=fmtp:110 0-15.
a=ptime:20.
a=maxptime:240.
a=sendrecv.
a=rtcp:30709.

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