NOTIFY sip:linksys2@192.168.0.71:5061 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.50:5060;branch=z9hG4bK7ec56b42;rport
From: "asterisk" <sip:asterisk@192.168.0.50>;tag=as6d2d7873
To: <sip:linksys2@192.168.0.71:5061>
Contact: <sip:asterisk@192.168.0.50>
Call-ID: 71aafce51bbbdafe456f1e6b7e4e775e@192.168.0.50
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: message-summary
Content-Type: application/simple-message-summary
Content-Length: 93

Messages-Waiting: yes
Message-Account: sip:asterisk@192.168.0.50
Voice-Message: 3/0 (0/0)