User's Manual 796 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
40.2 Configuring Call Survivability Mode
The CRP can be configured to operate in one of the following call survivability modes:
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 40-1: 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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