NOTIFY sip:development301@pbx1.demo.sipwise.com SIP/2.0
To: <sip:development301@pbx1.demo.sipwise.com>
From: <sip:development301@pbx1.demo.sipwise.com>;tag=12345
Call-ID: resynctest12345
CSeq: 1 NOTIFY
Subscription-State: active
Event: check-sync
Content-Length: 0