OPENSIPS
=========================
U 2016/09/20 07:17:07.186526 zzz.zzz.zz.zz:5060 -> xxx.xxx.xxx.xx:5060
SIP/2.0 200 OK.
Call-ID: EmlhmZ7Rgo.
CSeq: 21 INVITE.
Record-Route: <sip:zzz.zzz.zz.zz:5060;lr>,<sip:xxx.xx.xxx.xxx;lr;r2=on;ftag=-KAjCGKCS>,<sip:yyy.yy.yyy.yyy:443;transport=tls;lr;r2=on;ftag=-KAjCGKCS>.
Accept: application/sdp,application/isup,application/dtmf,application/dtmf-relay,multipart/mixed.
Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH.
Content-Disposition: session;handling=required.
Contact: <sip:zzz.zzz.zz.zz:5060>.
Via: SIP/2.0/UDP xxx.xx.xxx.xxx:5060;branch=z9hG4bK3e02.1aa513b.0,SIP/2.0/UDP 192.168.1.125:44717;rport=44717;branch=z9hG4bK.kLqhouqqc;received=aa.aa.aa.aaa.
To: <sip:91480xxxxx@zzz.zzz.zz.zz>;tag=GB-1474369455881.
Content-Type: application/sdp.
From: <sip:249636600@zzz.zzz.zz.zz>;tag=-KAjCGKCS.
Content-Length: 198.
.
v=0.
o=Sonus_UAC 1133751253 1334703812 IN IP4 bbb.bbb.bb.bb.
s=Nexge.
c=IN IP4 bbb.bbb.bb.bb.
t=0 0.
m=audio 17974 RTP/AVP 18.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=sendrecv.
a=maxptime:20.



KAMAILIO
===========================================================

U 2016/09/21 06:05:48.800528 115.112.144.18:5060 -> 192.69.136.4:5060
INVITE sip:919544678732@192.69.136.4 SIP/2.0.
Record-Route: <sip:yyy.yy.yyy.yyy:5060;r2=on;lr;ftag=SRvSyPNQO>.
Record-Route: <sip:115.112.144.18;line=sr-N6IAzBFsMJZ6zmZfMl37MBMwzBP4Ml14NEt7Nw05NhPQpSflzwVLHRQ7z6fLz6g43RNQjue6jwIP.ItH>.
Via: SIP/2.0/UDP yyy.yy.yyy.yyy:5060;branch=z9hG4bKc58b.6f7e9f1ed2bafa5c0f37f17d2a00d3b4.0;i=1.
Via: SIP/2.0/UDP 115.112.144.18;branch=z9hG4bKsr-j4IPOlV7MGQj.tMcM.qLOBF6zGZlOBFfW.vuWxPZW.1LgRWIC9gIgx4fz.V7M.3ZOBM7M.FuzuaVHRaYpB1JNEt736cQkBIvalaJmLZsK.rPPEIrWINXNh05NhPQW.P4zxj*.
From: <sip:376777@192.69.136.4>;tag=SRvSyPNQO.
To: "919544678732" <sip:919544678732@192.69.136.4>.
CSeq: 21 INVITE.
Call-ID: r9TSan9PpI.
Max-Forwards: 69.
Supported: outbound.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO, UPDATE.
Content-Type: application/sdp.
Content-Length: 186.
sip:376777@192.168.3.115:54485;transport=tlsProxy-Authorization:  Digest realm="192.69.136.4", nonce="6be6c6f3181f616a4130987e78f551c2", algorithm=MD5, username="376777",  uri="sip:919544678732@192.69.136.4", response="71f678e0f614156c11ea0d5f31810819".
Contact: <sip:115.112.144.18;line=sr-N6IAzBMwWBNwW404g9W4ORW536rYoJsl39Iho6u53EIdgmsBo64-W.y6My**>.
User-Agent: HD Dialer 1.5.1.
.
v=0.
o=376777 1327 2864 IN IP4 192.168.3.115.
s=HD Dialer.
c=IN IP4 192.168.3.115.
b=AS:380.
t=0 0.
m=audio 49288 RTP/AVP 18 101.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.