Configuring Pstn Fallback - AudioCodes Mediant 4000 SBC User Manual

Mode Index
8
9
Note:
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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.
Note:
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User's Manual
Source IP Request Type
Group
#3 [CRP All
Gateway]
#3 [CRP All
Gateway]
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 598).
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).
Destination Destination
Type IP Group
IP Group #2 [CRP
Proxy]
IP Group #1 [CRP
Users]
598
Mediant 4000 SBC
Destination Alternative
Address Route Options
- Route Row
- Alternative
Route Ignore
Document #: LTRT-40203
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