NOTIFY sip::0 SIP/2.0 Via: SIP/2.0/UDP 192.168.4.30:5060;branch=z9hG4bK2d5eacbe From: "asterisk" ;tag=as2b8148fe To: Contact: 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" ;tag=as2b8148fe To: 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