User's Manual 720 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Normal (Default): The CRP interworks between the branch users and the IP PBX
located at headquarters. The CRP forwards all requests (such as for registration) from
the branch users to the IP PBX, and routes the calls based on the IP-to-IP routing
rules. If communication with the IP PBX fails (i.e., Emergency mode), it still allows
calls between the branch users themselves. If this fails, it routes the calls to the PSTN
(if employed).
Figure 39-1: CRP in Normal & Auto Answer to Registrations Modes
Auto Answer to Registrations: This mode is the same as the Normal mode, except
that the CRP registers the branch users in its registration database instead of
forwarding them to the IP PBX.
Note: SIP REGISTER and OPTIONS requests are terminated at the CRP.
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