SIP Method : ACK

[ Line 1  ] ACK sip:+10123456789@192.168.1.2:5060;transport=udp SIP/2.0

[ Line 2  ] Via: SIP/2.0/UDP 192.168.1.15:5060;branch=z9hG4bK3608780455smg;transport=UDP

[ Line 3  ] From: <sip:+11234567890@ims.sharetechnote.com>;tag=659747293

[ Line 4  ] To: <sip:+10123456789@ims.sharetechnote.com>;tag=123456789

[ Line 5  ] CSeq: 1 ACK

[ Line 6  ] Call-ID: 131949458@192.168.1.15

[ Line 7  ] Max-Forwards: 70

[ Line 8  ] Route: <sip:192.168.1.2:5060;lr>

[ Line 9  ] Contact: <sip:+11234567890@192.168.1.15:5060;transport=UDP>;

              +g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel"

[ Line 10 ] Content-Length: 0