400HD Series IP Phones
Administrator's Manual 214 Document #: LTRT-11973
B.2.1.1 Redirection Process
Here's how redirection is performed (refer to Figure B-2):
The phone sends an HTTPS request to the redirect server.
The redirect server sends an HTTPS response with the provisioning server's URL.
The phone sends a request for cfg and img files to the provisioning server.
Communications between the phone and the redirect server are encrypted (HTTPS) for
security reasons. The phone uses the pre-installed AudioCodes factory-set certificate to
authenticate itself with the redirect server and to verify the latter's authenticity. If the redirect
URL (where the cfg file is located) also uses HTTPS protocol, the phone can use a regular
certificate - or the AudioCodes factory-set certificate - to authenticate itself and to validate
the server’s certificate if a trusted root certificate (regular) is configured.
Note: The phone repeats the redirect process whenever reset to factory defaults.
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