AudioCodes Mediant 800 MSBG User Manual page 167

SIP User's Manual
Assign IP Profiles: IP Profiles can be assigned to destination addresses (also when
a proxy is used).
Alternative Routing (when a proxy isn't used): An alternative IP destination can be
configured for specific call. To associate an alternative IP address to a called
telephone number prefix, assign it with an additional entry (with a different IP
address), or use an FQDN that resolves into two IP addresses. The call is sent to the
alternative destination when one of the following occurs:
•
Ping to the initial destination is unavailable, poor QoS (delay or packet loss,
calculated according to previous calls) is detected, or a DNS host name is
unresolved. For detailed information on Alternative Routing, see ''Configuring
Alternative Routing (Based on Connectivity and QoS'' on page 442).
•
A defined Release Reason code (see ''Configuring Alternative Routing Reasons''
on page 174) is received.
Alternative routing is typically implemented when there is no response to an INVITE
message (after INVITE re-transmissions). The device then issues an internal 408 'No
Response' implicit Release Reason. If this reason is defined (see ''Configuring
Alternative Routing Reasons'' on page 174), the device immediately initiates a call to
the alternative destination using the next matching entry in this routing table. Note that
if a domain name in this table is resolved into two IP addresses, the timeout for
INVITE re-transmissions can be reduced by using the HotSwapRtx parameter.
Notes:
Version 6.2
•
If the alternative routing destination is the device itself, the call can be
configured to be routed to the PSTN. This feature is referred to as PSTN
Fallback. For example, if poor voice quality occurs over the IP network,
the call is rerouted through the legacy telephony system (PSTN).
•
Outbound IP routing can be performed before or after number
manipulation. This is configured using the RouteModeTel2IP parameter,
as described below.
•
You can also configure this table using the ini file table parameter Prefix
(see ''Number Manipulation and Routing Parameters'' on page 836).
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3. Web-Based Management
February 2011