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Solution

When "PNP config" is "ON" (by default) the phone sends a SUBSCRIBE message to a multicast address. All setting servers which have membership to the group can respond to the SUBSCRIBE and send NOTIFY messages with the setting server HTTP URL in the body. The phone then retrieves its settings from the link specified.

This is particularly useful for out of the box setup of devices and mass deployment.

Please see this Sample SIP Trace for further details.

PnP Config 

Sent to udp:224.0.1.75:5060 at 24/12/2001 00:00:19:248 (448 bytes):

SUBSCRIBE sip:MAC%3a00135E874B49@intern.snom.de SIP/2.0
Via: SIP/2.0/UDP 192.168.10.67:5060;rport
From: <sip:MAC%3a00135E874B49@intern.snom.de>;tag=658512961
To: <sip:MAC%3a00135E874B49@intern.snom.de>
Call-ID: 1930770594@192.168.10.67
CSeq: 1 SUBSCRIBE
Event: ua-profile;profile-type="device";vendor="OEM";model="OEM";version="7.1.19"
Expires: 0
Accept: application/url
Contact: <sip:192.168.10.67:5060>
Content-Length: 0
Received from udp:192.168.100.10:5060 at 24/12/2001 00:00:19:287 (480 bytes):

SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.10.67:5060;rport=5060
Record-Route: <sip:127.0.0.1;lr;transport=tcp;route-id=fb4fb92b7775c2a7>
Record-Route: <sip:192.168.100.10;lr;transport=UDP;route-id=fb4fb92b7775c2a7>
Contact: <sip:192.168.100.10;transport=TCP;handler=dum>
To: <sip:MAC%3a00135E874B49@intern.snom.de>;tag=91955270
From: <sip:MAC%3a00135E874B49@intern.snom.de>;tag=658512961
Call-ID: 1930770594@192.168.10.67
CSeq: 1 SUBSCRIBE
Expires: 0 
Content-Length: 0
Received from udp:192.168.100.10:5060 at 24/12/2001 00:00:19:293 (868 bytes):

NOTIFY sip:192.168.10.67:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.100.10:5060;branch=z9hG4bK-d8754z-c3ea5f0e74462613-1---d8754z-;rport
Via: SIP/2.0/TCP 127.0.0.1:5060;branch=z9hG4bK-d8754z-7ca96c30144f3e04-1---d8754z-;rport=40916
Max-Forwards: 20
Record-Route: <sip:192.168.100.10;lr;route-id=e3470eb400e9c0a4>
Record-Route: <sip:127.0.0.1;lr;transport=TCP;route-id=e3470eb400e9c0a4>
Contact: <sip:192.168.100.10;transport=TCP;handler=dum>
To: <sip:MAC%3a00135E874B49@intern.snom.de>;tag=658512961
From: <sip:MAC%3a00135E874B49@intern.snom.de>;tag=91955270
Call-ID: 1930770594@192.168.10.67
CSeq: 3 NOTIFY
Content-Type: application/url
Subscription-State: terminated;reason=timeout
Event: ua-profile;profile-type="device";vendor="OEM";model="OEM";version="7.1.19"
Content-Length: 59
http://192.168.100.10/sipphone/sipphoneconfig.xml?mac={mac}
Sent to udp:192.168.100.10:5060 at 24/12/2001 00:00:19:315 (542 bytes):

SIP/2.0 200 Ok
Via: SIP/2.0/UDP 192.168.100.10:5060;branch=z9hG4bK-d8754z-c3ea5f0e74462613-1---d8754z-;rport=5060
Via: SIP/2.0/TCP 127.0.0.1:5060;branch=z9hG4bK-d8754z-7ca96c30144f3e04-1---d8754z-;rport=40916
Record-Route: <sip:192.168.100.10;lr;route-id=e3470eb400e9c0a4>
Record-Route: <sip:127.0.0.1;lr;transport=TCP;route-id=e3470eb400e9c0a4>
From: <sip:MAC%3a00135E874B49@intern.snom.de>;tag=91955270
To: <sip:MAC%3a00135E874B49@intern.snom.de>;tag=658512961
Call-ID: 1930770594@192.168.10.67
CSeq: 3 NOTIFY
Content-Length: 0


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