Configuring Pstn Fallback - AudioCodes Mediant 800B User Manual

31.5

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.
Notes:
•
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).
User's Manual
Mediant 800B Gateway and E-SBC
562 Document #: LTRT-10286