IMS

SIP Method : 100 TRYING

100 Trying method is just an indicator saying "I am doing something for you" and it does not do any special task on its own. so the contents is very simple as shown below.

[ Line 1  ] SIP/2.0 100 Trying

[ Line 2  ] Via: SIP/2.0/UDP 192.168.1.15:5060;branch=z9hG4bK3298736468smg;transport=UDP

[ Line 3  ] To: <sip:+10123456789@ims.sharetechnote.com>

[ Line 4  ] From: <sip:+11234567890@ims.sharetechnote.com>;tag=659747293

[ Line 5  ] Call-ID: 131949458@192.168.1.15

[ Line 6  ] CSeq: 1 INVITE

[ Line 7  ] Content-Length: 0