Configuring Pstn Fallback - AudioCodes Mediant 800B User Manual

Mode Index
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40.5

Configuring PSTN Fallback

You can enable the CRP to route emergency calls (or PSTN-intended calls) such as "911" from
the Proxy server (IP Group 2) to the PSTN (IP Group 3). In addition, for calls from the Proxy
server to Users (IP Group 1), the device searches for a matching user in its Users Registration
database and if not not located, it sends the call to the PSTN (IP Group 3), as an alternative
route.
To enable this feature, set the ini file parameter CRPGatewayFallback to 1. When enabled, the
alternative routing rule appears immediately below the IP Group 2 to IP Group 1 rule in the IP-to-
IP Routing table.
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User's Manual
Source IP Request Type
Group
The destination for the routing rule at Index 2 is the source IP Group (i.e., from where
the REGISTER message is received).
Routing rule at Index 7 appears only if the CRPGatewayFallback parameter is enabled
(see Configuring PSTN Fallback on page 800).
Enabling this feature (this routing rule) may expose the device to a security "hole",
allowing calls from the WAN to be routed to the Gateway. Thus, configure this feature
with caution and only if necessary.
This PSTN routing rule is not an alternative routing rule. In other words, if a match for a
user is located in the database, this PSTN rule will never be used regardless of the
state of the user endpoint (e.g., busy).
Mediant 800B Gateway & E-SBC
Destination Destination IP
Type Group
800
Destination
Address
Document #: LTRT-10632
Alternative
Route Options
Inputs