### Client sends SUBSCRIBE to Proxy

U 2009/03/23 17:52:41.385603 PHONE_IP:5060 -> PROXY_IP_PORT
SUBSCRIBE sip:client200@mydomain.org SIP/2.0
Via: SIP/2.0/UDP 10.134.19.231:5060;branch=z9hG4bK-7893680
From: "Linksys 962" <sip:client202@mydomain.org>;tag=3d066da577829dd8
To: <sip:client200@mydomain.org>
Call-ID: f96f7f69-72a516e4@10.134.19.231
CSeq: 43407 SUBSCRIBE
Max-Forwards: 70
Proxy-Authorization: Digest username="client202",realm="mydomain.org",nonce="49c7be77000000070eb041a3fbbe5cabf1d180e9b88d2013",uri="sip:client200@mydomain.org",algorithm=MD5,response="7dd32e0a30c3e7f0d98caadfe0d04389",qop=auth,nc=00000001,cnonce="9c8078ac"
Contact: "Linksys 962" <sip:client202@10.134.19.231:5060>
Accept: application/dialog-info+xml
Expires: 60
Event: dialog
User-Agent: Linksys/SPA962-6.1.3(a)
Content-Length: 0


### Proxy routes SUBSCRIBE to Asterisk adding Record-Route

U 2009/03/23 17:52:41.386325 PROXY_IP_PORT -> ASTERISK_IP_PORT
SUBSCRIBE sip:client200@ASTERISK_IP_PORT SIP/2.0
Record-Route: <sip:222.111.19.45;lr=on;ftag=3d066da577829dd8>
Via: SIP/2.0/UDP 222.111.19.45;branch=z9hG4bKe679.469107f5.0
Via: SIP/2.0/UDP 10.134.19.231:5060;rport=5060;received=PHONE_IP;branch=z9hG4bK-7893680
From: "Linksys 962" <sip:client202@mydomain.org>;tag=3d066da577829dd8
To: <sip:client200@mydomain.org>
Call-ID: f96f7f69-72a516e4@10.134.19.231
CSeq: 43407 SUBSCRIBE
Max-Forwards: 69
Contact: "Linksys 962" <sip:client202@PHONE_IP:5060>
Accept: application/dialog-info+xml
Expires: 60
Event: dialog
User-Agent: Linksys/SPA962-6.1.3(a)
Content-Length: 0


### Asterisk replies 200 and mirrors Record-Route in the reply (correct)

U 2009/03/23 17:52:41.386683 ASTERISK_IP_PORT -> PROXY_IP_PORT
SIP/2.0 200 OK
Via: SIP/2.0/UDP 222.111.19.45;branch=z9hG4bKe679.469107f5.0;received=222.111.19.45
Via: SIP/2.0/UDP 10.134.19.231:5060;rport=5060;received=PHONE_IP;branch=z9hG4bK-7893680
Record-Route: <sip:222.111.19.45;lr=on;ftag=3d066da577829dd8>
From: "Linksys 962" <sip:client202@mydomain.org>;tag=3d066da577829dd8
To: <sip:client200@mydomain.org>;tag=as123c0553
Call-ID: f96f7f69-72a516e4@10.134.19.231
CSeq: 43407 SUBSCRIBE
User-Agent: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Expires: 60
Contact: <sip:client200@ASTERISK_IP_PORT>;expires=60
Content-Length: 0


### Proxy routes teh 200 to the Client

U 2009/03/23 17:52:41.387546 PROXY_IP_PORT -> PHONE_IP:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.134.19.231:5060;rport=5060;received=PHONE_IP;branch=z9hG4bK-7893680
Record-Route: <sip:222.111.19.45;lr=on;ftag=3d066da577829dd8>
From: "Linksys 962" <sip:client202@mydomain.org>;tag=3d066da577829dd8
To: <sip:client200@mydomain.org>;tag=as123c0553
Call-ID: f96f7f69-72a516e4@10.134.19.231
CSeq: 43407 SUBSCRIBE
User-Agent: Asterisk
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Expires: 60
Contact: <sip:client200@ASTERISK_IP_PORT>;expires=60
Content-Length: 0


### Asterisk sends an in-dialog NOTIFY but doesn't add Route headers (wrong!!!)

U 2009/03/23 17:52:41.386738 ASTERISK_IP_PORT -> PROXY_IP_PORT
NOTIFY sip:client202@PHONE_IP:5060 SIP/2.0
Via: SIP/2.0/UDP ASTERISK_IP_PORT;branch=z9hG4bK19ea1e04;rport
From: <sip:client200@mydomain.org>;tag=as123c0553
To: "Linksys 962" <sip:client202@mydomain.org>;tag=3d066da577829dd8
Contact: <sip:client200@ASTERISK_IP_PORT>
Call-ID: f96f7f69-72a516e4@10.134.19.231
CSeq: 102 NOTIFY
User-Agent: Asterisk
Max-Forwards: 70
Event: dialog
Content-Type: application/dialog-info+xml
Subscription-State: active
Content-Length: 231

<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sip:client200@mydomain.org">
<dialog id="client200">
<state>terminated</state>
</dialog>
</dialog-info>


### The proxy refuses this NOTIFY since it has To_tag but no Route headers (correct behaviour in the proxy)

U 2009/03/23 17:52:41.388205 PROXY_IP_PORT -> ASTERISK_IP_PORT
SIP/2.0 403 To_tag but no loose routing, not here!
Via: SIP/2.0/UDP ASTERISK_IP_PORT;branch=z9hG4bK19ea1e04;rport=5070
From: <sip:client200@mydomain.org>;tag=as123c0553
To: "Linksys 962" <sip:client202@mydomain.org>;tag=3d066da577829dd8
Call-ID: f96f7f69-72a516e4@10.134.19.231
CSeq: 102 NOTIFY
Server: Kamailio (1.5.0-notls (x86_64/linux))
Content-Length: 0