spa942.local:3354 -> sipb.provider.com:5060
SUBSCRIBE sip:2036@sipb.provider.com SIP/2.0.
Via: SIP/2.0/UDP 192.168.0.44:5060;branch=z9hG4bK-30bde5c3;rport.
From: "4590" <sip:4590@sipb.provider.com>;tag=352777379609d209.
To: <sip:2036@sipb.provider.com>.
Call-ID: 461aa94f-dd7686d1@192.168.0.44.
CSeq: 25000 SUBSCRIBE.
Max-Forwards: 70.
Contact: "4590" <sip:4590@192.168.0.44:5060>.
Accept: application/dialog-info+xml.
Expires: 1800.
Event: dialog.
User-Agent: Linksys/SPA942-6.1.5(a).
Content-Length: 0.
.

sipb.provider.com:5060 -> spa942.local:3354
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.0.44:5060;branch=z9hG4bK-61dc2f7;rport=3354;received=spa942.local.
From: "4590" <sip:4590@sipb.provider.com>;tag=352777379609d209.
To: <sip:2036@sipb.provider.com>;tag=5dd6e7cfb382f22810ec02377fb059aa-3ccc.
Call-ID: 461aa94f-dd7686d1@192.168.0.44.
CSeq: 25001 SUBSCRIBE.
Expires: 1800.
Contact: <sip:sipb.provider.com:5060>.
Content-Length: 0.
.


sipb.provider.com:5060 -> spa942.local:3354
NOTIFY sip:4590@spa942.local:3354 SIP/2.0.
Via: SIP/2.0/UDP sipb.provider.com;branch=z9hG4bK5c33.cccc8902.0.
To: <sip:4590@sipb.provider.com>;tag=352777379609d209.
From: <sip:2036@sipb.provider.com>;tag=5dd6e7cfb382f22810ec02377fb059aa-3ccc.
CSeq: 1 NOTIFY.
Call-ID: 461aa94f-dd7686d1@192.168.0.44.
Content-Length: 0.
Max-Forwards: 70.
Event: dialog.
Contact: <sip:sipb.provider.com:5060>.
Subscription-State: active;expires=1800.
.


spa942.local:3354 -> sipb.provider.com:5060
SIP/2.0 200 OK.
To: <sip:4590@sipb.provider.com>;tag=352777379609d209.
From: <sip:2036@sipb.provider.com>;tag=5dd6e7cfb382f22810ec02377fb059aa-3ccc.
Call-ID: 461aa94f-dd7686d1@192.168.0.44.
CSeq: 1 NOTIFY.
Via: SIP/2.0/UDP sipb.provider.com;branch=z9hG4bK5c33.cccc8902.0;received=sipb.provider.com.
Server: Linksys/SPA942-6.1.5(a).
Content-Length: 0.