NOTIFY sip::0 SIP/2.0
Via: SIP/2.0/UDP 192.168.4.30:5060;branch=z9hG4bK2d5eacbe
From: "asterisk" <sip:asterisk@192.168.4.30>;tag=as2b8148fe
To: <sip::0>
Contact: <sip:asterisk@192.168.4.30>
Call-ID: 7c42dbdf1bfd793c138da2f029e2a219@192.168.4.30
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Event: check-sync
Content-Length: 0

SIP/2.0 400 Bad Request
Via: SIP/2.0/UDP 192.168.4.30:5060;branch=z9hG4bK2d5eacbe
From: "asterisk" <sip:asterisk@192.168.4.30>;tag=as2b8148fe
To: <sip::0>
Call-ID: 7c42dbdf1bfd793c138da2f029e2a219@192.168.4.30
Date: Tue, 04 Jan 2005 22:47:29 GMT
Warning: 399 Bad Request - 'Invalid SDP information'
CSeq: 102 NOTIFY
Content-Length: 0