Version 6.2
167
February 2011
SIP User's Manual
3. Web-Based Management
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
•
A defined Release Reason code (see ''Configuring Alternative Routing Reasons''
on page
) 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
), 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:
•
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
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