AudioCodes 420HD - Performing Advanced Operations; Answering Waiting Calls

Administrator's Manual 10. Obtaining Firmware and Configuration Files
Version 2.2.8 55 400HD Series IP Phones
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
The following code describes SIP NOTIFY Message with Provisioning Information.
NOTIFY sip:10.13.2.37:5060 SIP/2.0
Via: SIP/2.0/UDP
10.13.2.37:5060;rport;branch=z9hG4bK-386d4398-6ad00ca2-7ca3606e
Max-Forwards: 20
Contact: <sip:10.13.4.121:5060>
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 NOTIFY
Content-Type: application/url
Subscription-State: terminated;reason=timeout
Event:
ua-profile;profile-type="application";model="440HD";version="2.2.2"
Content-Length: 18
tftp://10.13.4.121