Administrator's Manual 10. Obtaining Firmware and Configuration Files
Version 2.2.8 53 400HD Series IP Phones
10.2.4 SIP SUBSCRIBE and NOTIFY Messages
If the provisioning information (e.g. Option fields 66/67/160) is not provided by the DHCP
server, the phone sends a SIP SUBSCRIBE message to the multicast address
224.0.1.75:5060 as shown below.
Note: If the provisioning server supports using SIP SUBSCRIBE and NOTIFY messages
and the device receives the provisioning URL in the NOTIFY message, the automatic
provisioning mechanism then periodically tries to retrieve a new firmware/configuration
according to the information provided.
SUBSCRIBE sip:224.0.1.75:5060 SIP/2.0
From:
<sip:00000001@10.13.2.37:5060>;tag=87a5a8-25020d0a-13c4-50029-386d
4398-66dc40c-386d4398
To: <sip:224.0.1.75:5060>
Call-ID: 8884c8-25020d0a-13c4-50029-386d4398-3e2bcb8e-386d4398
CSeq: 1 SUBSCRIBE
Via: SIP/2.0/UDP
10.13.2.37:5060;rport;branch=z9hG4bK-386d4398-6ad00ca2-7ca3606e
Expires: 0
Event:
ua-profile;profile-type="application";model="440HD";version="2.2.2"
Max-Forwards: 70
Supported: replaces,100rel
Accept: application/url
Contact: <sip:00000001@10.13.2.37:5060>
User-Agent: AUDC-IPPhone/2.2.2
Content-Length: 0
The provisioning server or any other entity replies with a 200 OK message to the
SUBSCRIBE message (see below) and sends a NOTIFY SIP message with the provisioning
URL in the message body as shown below. (The provisioning URL can be in any format as
described in the Administrator's Manual).
If no response is received by the provisioning server, the phone resends SUBSCRIBE
messages for five seconds.
With the above method, the phone uses its built-in auto-provisioning mechanism while the
provisioning information is retrieved through the NOTIFY message.
The following code describes SIP 200 OK Response on the SUBSCRIBE Message:
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.13.2.37:5060;rport;branch=z9hG4bK-386d4398-6ad00ca2-7ca3606e
Contact: <sip:10.13.2.37:5060>
To: <sip:224.0.1.75:5060>
From:
<sip:00000001@10.13.2.37:5060>;tag=87a5a8-25020d0a-13c4-50029-386d
4398-66dc40c-386d4398
Call-ID: 8884c8-25020d0a-13c4-50029-386d4398-3e2bcb8e-386d4398
CSeq: 1 SUBSCRIBE
Expires: 0
Content-Length: 0
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