22:40:16.258110 IP (tos 0x68, ttl 249, id 782, offset 0, flags [none], proto UDP (17), length 361)
    192.168.1.60.5073 > SIP_PROVIDER_IP.5060: [udp sum ok] SIP, length: 333
	NOTIFY sip:SIP_PROVIDER_IP SIP/2.0
	Via: SIP/2.0/UDP 192.168.1.60:5073;branch=z9hG4bK-c3591117;rport
	From: 207 <sip:207@SIP_PROVIDER_IP>;tag=f2b7765f5cf1986eo1
	To: <sip:SIP_PROVIDER_IP>
	Call-ID: 1786ded7-d4988a56@192.168.1.60
	CSeq: 1 NOTIFY
	Max-Forwards: 70
	Event: keep-alive
	User-Agent: Linksys/PAP2T-3.1.15(LS)
	Content-Length: 0