Reliably Transmitting (no NAT) to 192.168.1.5:1294:
NOTIFY sip:504@192.168.1.5:1294 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.2:5060;branch=z9hG4bK349f40e0
From: "507"<sip:507@192.168.1.2>;tag=as6e81e40f
To: "Prova"<sip:504@192.168.1.2>;tag=8e60e24a
Contact: <sip:507@192.168.1.2>
Call-ID: NzJiNjEyN2VlODEyZDgyOWM4YjQ0NjNhZjY1NWZjYTI.
CSeq: 106 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: presence
Content-Type: application/pidf+xml
Subscription-State: active
Content-Length: 523

<?xml version="1.0" encoding="ISO-8859-1"?>
<presence xmlns="urn:ietf:params:xml:ns:pidf" 
xmlns:pp="urn:ietf:params:xml:ns:pidf:person"
xmlns:es="urn:ietf:params:xml:ns:pidf:rpid:status:rpid-status"
xmlns:ep="urn:ietf:params:xml:ns:pidf:rpid:rpid-person"
entity="sip:504@192.168.1.2">
<pp:person><status>
<ep:activities><ep:away/></ep:activities>
</status></pp:person>
<note>Not online</note>
<tuple id="507">
<contact priority="1">sip:507@192.168.1.2</contact>
<status><basic>closed</basic></status>
</tuple>
</presence>

---
 Extension Changed 507 new state Unavailable for Notify User 504
Reliably Transmitting (no NAT) to 192.168.1.43:5060:
NOTIFY sip:503@192.168.1.43:5060;user=phone SIP/2.0
Via: SIP/2.0/UDP 192.168.1.2:5060;branch=z9hG4bK75bd84ba
From: <sip:507@192.168.1.2:5060>;tag=as31c4f9f9
To: <sip:503@192.168.1.2:5060>;tag=c0a80101-156f
Contact: <sip:507@192.168.1.2>
Call-ID: 6b00-c0a80101-d-5@192.168.1.43
CSeq: 109 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: dialog
Content-Type: application/dialog-info+xml
Subscription-State: active
Content-Length: 207

<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="7" state="full" entity="sip:507@192.168.1.2:5060">
<dialog id="507">
<state>terminated</state>
</dialog>
</dialog-info>

---
 Extension Changed 507 new state Unavailable for Notify User 503
pbx*CLI> 
<--- SIP read from 192.168.1.43:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.2:5060;branch=z9hG4bK75bd84ba
From: <sip:507@192.168.1.2:5060>;tag=as31c4f9f9
To: <sip:503@192.168.1.2:5060>;tag=c0a80101-156f
Call-ID: 6b00-c0a80101-d-5@192.168.1.43
CSeq: 109 NOTIFY
Content-Length: 0


<------------->
--- (7 headers 0 lines) ---
SIP Response message for INCOMING dialog NOTIFY arrived
pbx*CLI> 
<--- SIP read from 192.168.1.5:1294 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.2:5060;branch=z9hG4bK349f40e0
Contact: <sip:504@192.168.1.5:1294>
To: "Prova"<sip:504@192.168.1.2>;tag=8e60e24a
From: "507"<sip:507@192.168.1.2>;tag=as6e81e40f
Call-ID: NzJiNjEyN2VlODEyZDgyOWM4YjQ0NjNhZjY1NWZjYTI.
CSeq: 106 NOTIFY
User-Agent: X-Lite release 1011s stamp 41150
Content-Length: 0


<------------->
--- (9 headers 0 lines) ---
SIP Response message for INCOMING dialog NOTIFY arrived