Call setup flow
UE1	Tx	INVITE (SDP)
UE1 Rx	100 Trying
UE2	Rx	INVITE
UE2	Tx	100 Trying
UE2	Tx	183 Session Progress (SDP)
UE1	Rx	183	Session Progress
UE1	Tx	PRACK
UE2	Rx	PRACK
UE2	Tx	200 OK (PRACK)
UE1	Rx	200 OK	(PRACK)
UE1	Tx	UPDATE (SDP)
UE2	Rx	UPDATE
UE2	Tx	200 OK (UPDATE)
UE1	Rx	200	OK (UPDATE)
UE2	Tx	180 Ringing	(INVITE)
UE1 Rx	180	Ringing	(INVITE)
UE2	Tx	200 OK (INVITE)
UE1	Rx	200	OK (INVITE)
UE1	Tx	ACK
UE2	Rx	ACK
RTP/RTCP
BYE





UE1 Tx INVITE

  INVITE sip:+420739365061@ims.t-mobile.cz;user=phone SIP/2.0
  P-Preferred-Service: urn:urn-7:3gpp-service.ims.icsi.mmtel
  P-Preferred-Identity: <sip:+420739365037@ims.t-mobile.cz>
  P-Early-Media: supported
  Session-Expires: 1800
  Accept: application/sdp,application/3gpp-ims+xml
  Accept-Contact: *;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel"
  Content-Type: application/sdp
  From: <sip:+420739365037@ims.t-mobile.cz>;tag=584714068
  To: <sip:+420739365061@ims.t-mobile.cz;user=phone>
  Call-ID: 1973842583@100.73.237.252
  CSeq: 1 INVITE
  Max-Forwards: 70
  Contact: <sip:+420739365037@100.73.237.252:6000>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";+sip.instance="<urn:gsma:imei:35341407-192090-0>"
  Require: sec-agree
  Proxy-Require: sec-agree
  Security-Verify: ipsec-3gpp;q=0.1;alg=hmac-sha-1-96;ealg=null;prot=esp;mod=trans;spi-c=3957458158;spi-s=3957458159;port-c=5002;port-s=6000
  Supported: 100rel,timer,precondition,histinfo,sec-agree,gruu
  P-Access-Network-Info: 3GPP-E-UTRAN-FDD;utran-cell-id-3gpp=23001b860117220e
  User-Agent: Samsung IMS 5.0
  Via: SIP/2.0/TCP 100.73.237.252:6000;branch=z9hG4bK967459321smg;transport=TCP;rport
  Allow: INVITE,ACK,OPTIONS,CANCEL,BYE,UPDATE,INFO,REFER,NOTIFY,MESSAGE,PRACK
  Route: <sip:230015002701418@10.225.139.195:6000;transport=TCP;lr>
  Content-Length: 789
  
  v=0
  o=SAMSUNG-IMS-UE 1234562 0 IN IP4 100.73.237.252
  s=SS VOIP
  c=IN IP4 100.73.237.252
  b=AS:41
  b=RS:612
  b=RR:1837
  t=0 0
  m=audio 1234 RTP/AVP 116 107 118 96 111 110
  b=AS:41
  b=RS:612
  b=RR:1837
  a=rtpmap:116 AMR-WB/16000/1
  a=fmtp:116 mode-change-capability=2;max-red=0
  a=rtpmap:107 AMR-WB/16000/1
  a=fmtp:107 octet-align=1;mode-change-capability=2;max-red=0
  a=rtpmap:118 AMR/8000/1
  a=fmtp:118 mode-change-capability=2;max-red=0
  a=rtpmap:96 AMR/8000/1
  a=fmtp:96 octet-align=1;mode-change-capability=2;max-red=0
  a=rtpmap:111 telephone-event/16000
  a=fmtp:111 0-15
  a=rtpmap:110 telephone-event/8000
  a=fmtp:110 0-15
  a=curr:qos local none
  a=curr:qos remote none
  a=des:qos mandatory local sendrecv
  a=des:qos optional remote sendrecv
  a=sendrecv
  a=ptime:20
  a=maxptime:240

  
  
  
  
UE2 Tx	183 Session Progress

  SIP/2.0 183 Session Progress
  RSeq: 123
  Require: 100rel,precondition
  Content-Type: application/sdp
  From: <sip:+420739365037@ims.t-mobile.cz>;tag=SD2hhca01-mavodi-1-10b-29-11-ffffffff-_000050BF7998-118e-92f8700-42e466-5713f4b1-be61d
  To: <sip:+420739365061@ims.t-mobile.cz;user=phone>;tag=2431461527
  Via: SIP/2.0/TCP 10.225.139.195:6000;branch=z9hG4bK5pd260100g0kfm8s29f0.1
  Call-ID: SD2hhca01-ddf952924e3418be9640661608142a3e-agv0i12010
  CSeq: 1 INVITE
  Contact: <sip:+420739365061@100.77.188.30:6000>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";+sip.instance="<urn:gsma:imei:35676506-051387-0>"
  Allow: INVITE,ACK,OPTIONS,CANCEL,BYE,UPDATE,INFO,REFER,NOTIFY,MESSAGE,PRACK
  P-Access-Network-Info: 3GPP-E-UTRAN-FDD;utran-cell-id-3gpp=23001b860117220e
  User-Agent: Samsung IMS 5.0
  Content-Length: 503
  
  v=0
  o=SAMSUNG-IMS-UE 1234562 0 IN IP4 100.77.188.30
  s=SS VOIP
  c=IN IP4 100.77.188.30
  b=AS:41
  b=RS:612
  b=RR:1837
  t=0 0
  m=audio 1234 RTP/AVP 116 111
  b=AS:41
  b=RS:612
  b=RR:1837
  a=rtpmap:116 AMR-WB/16000/1
  a=fmtp:116 mode-change-capability=2;max-red=0
  a=rtpmap:111 telephone-event/16000
  a=fmtp:111 0-15
  a=curr:qos local none
  a=curr:qos remote none
  a=des:qos mandatory local sendrecv
  a=des:qos mandatory remote sendrecv
  a=conf:qos remote sendrecv
  a=sendrecv
  a=ptime:20
  a=maxptime:240

  
  
  
  
UE1 Tx UPDATE
 
UPDATE sip:SDjpkid-vv9pmjr8trimov41vsmfmpb0j886jof0alaj9sbtalalqbahuvj5sp7hnnvhfdvrorctvdkvopmcj7vv9vmf8grh8006g41v@10.225.139.195:6000;transport=TCP SIP/2.0
  Content-Type: application/sdp
  Require: precondition,sec-agree
  Proxy-Require: sec-agree
  Security-Verify: ipsec-3gpp;q=0.1;alg=hmac-sha-1-96;ealg=null;prot=esp;mod=trans;spi-c=3957458158;spi-s=3957458159;port-c=5002;port-s=6000
  Supported: 100rel,timer,precondition,histinfo,sec-agree,gruu
  P-Access-Network-Info: 3GPP-E-UTRAN-FDD;utran-cell-id-3gpp=23001b7981125f0b
  User-Agent: Samsung IMS 5.0
  From: <sip:+420739365037@ims.t-mobile.cz>;tag=584714068
  To: <sip:+420739365061@ims.t-mobile.cz;user=phone>;tag=SDtsb5c99-mavodi-1-10b-23-10-ffffffff-_000050BF7998-118e-a4f9700-42f986-5713f4b2-69460
  CSeq: 3 UPDATE
  Call-ID: 1973842583@100.73.237.252
  Max-Forwards: 70
  Contact: <sip:+420739365037@100.73.237.252:6000>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";+sip.instance="<urn:gsma:imei:35341407-192090-0>"
  Via: SIP/2.0/TCP 100.73.237.252:6000;branch=z9hG4bK1054793723smg;transport=TCP;rport
  Allow: INVITE,ACK,OPTIONS,CANCEL,BYE,UPDATE,INFO,REFER,NOTIFY,MESSAGE,PRACK
  Route: <sip:230015002701418@10.225.139.195:6000;transport=TCP;lr>
  Content-Length: 481
  
  v=0
  o=SAMSUNG-IMS-UE 1234562 1 IN IP4 100.73.237.252
  s=SS VOIP
  c=IN IP4 100.73.237.252
  b=AS:41
  b=RS:612
  b=RR:1837
  t=0 0
  m=audio 1234 RTP/AVP 116 111
  b=AS:41
  b=RS:612
  b=RR:1837
  a=rtpmap:116 AMR-WB/16000/1
  a=fmtp:116 mode-change-capability=2;max-red=0
  a=rtpmap:111 telephone-event/16000
  a=fmtp:111 0-15
  a=curr:qos local sendrecv
  a=curr:qos remote none
  a=des:qos mandatory local sendrecv
  a=des:qos mandatory remote sendrecv
  a=sendrecv
  a=ptime:20
  a=maxptime:240

  
  
  
  
  
UE2 Tx OK  
  
  SIP/2.0 200 OK
  Supported: 100rel,timer,precondition,histinfo
  Content-Type: application/sdp
  From: <sip:+420739365037@ims.t-mobile.cz>;tag=SD2hhca01-mavodi-1-10b-29-11-ffffffff-_000050BF7998-118e-92f8700-42e466-5713f4b1-be61d
  To: <sip:+420739365061@ims.t-mobile.cz;user=phone>;tag=2431461527
  Via: SIP/2.0/TCP 10.225.139.195:6000;branch=z9hG4bKj14ilf304835gai5om60.1
  Call-ID: SD2hhca01-ddf952924e3418be9640661608142a3e-agv0i12010
  CSeq: 3 UPDATE
  Contact: <sip:+420739365061@100.77.188.30:6000>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";+sip.instance="<urn:gsma:imei:35676506-051387-0>"
  Allow: INVITE,ACK,OPTIONS,CANCEL,BYE,UPDATE,INFO,REFER,NOTIFY,MESSAGE,PRACK
  P-Access-Network-Info: 3GPP-E-UTRAN-FDD;utran-cell-id-3gpp=23001b860117220e
  User-Agent: Samsung IMS 5.0
  Content-Length: 483
  
  v=0
  o=SAMSUNG-IMS-UE 1234562 1 IN IP4 100.77.188.30
  s=SS VOIP
  c=IN IP4 100.77.188.30
  b=AS:41
  b=RS:612
  b=RR:1837
  t=0 0
  m=audio 1234 RTP/AVP 116 111
  b=AS:41
  b=RS:612
  b=RR:1837
  a=rtpmap:116 AMR-WB/16000/1
  a=fmtp:116 mode-change-capability=2;max-red=0
  a=rtpmap:111 telephone-event/16000
  a=fmtp:111 0-15
  a=curr:qos local sendrecv
  a=curr:qos remote sendrecv
  a=des:qos mandatory local sendrecv
  a=des:qos mandatory remote sendrecv
  a=sendrecv
  a=ptime:20
  a=maxptime:240
