Alternative Routing Based On Sip Responses - AudioCodes Mediant 800B MSBR User Manual

Mediant 800B MSBR
The steps for configuring alternative Tel-to-IP routing based on IP connectivity are
summarized below.

To configure alternative Tel-to-IP routing based on IP connectivity:
1. In the Outbound IP Routing table, add alternative Tel-to-IP routing rules for specific
calls.
2. In the Routing General Parameters page (Configuration tab > VoIP menu > GW and
IP to IP > Routing > General Parameters), do the following:
a. Enable alternative routing based on IP connectivity, by setting the 'Enable Alt
Routing Tel to IP AltRouting' (Tel2IPEnable) parameter to Enable.
b. Configure the IP connectivity reason for triggering alternative routing, by setting
the 'Alt Routing Tel to IP Mode' parameter (AltRoutingTel2IPMode) to one of the
following:
♦
♦
♦
c. The device plays a tone to the Tel endpoint (for analog interfaces) whenever an
alternative route is used. This tone is played for a user-defined time configured by
the 'Alternative Routing Tone Duration' parameter.

28.5.2 Alternative Routing Based on SIP Responses

The device can perform alternative routing based on the received SIP response code (i.e.,
4xx, 5xx, 6xx, or 8xx). If you have configured this response code in the Reasons for Tel-to-
IP Alternative Routing table, the device attempts to re-route the call to an alternative
destination, if configured. You can configure up to 10 SIP response codes in the Reasons
for Tel-to-IP Alternative Routing table.
Typically, the device performs alternative routing when there is no response at all to an
INVITE message. This is done after a user-defined number of INVITE re-transmissions,
configured by the SIPMaxRtx parameter. In such a scenario, the device issues itself the
SIP response code 408 (Request Timeout). You can also configure the device to perform
alternative routing for the following proprietary response codes that are issued by the
device itself:

805 IP Profile Call Limit: The device generates this response code when Call
Admission Control (CAC) limits are exceeded for an IP Group. The CAC rules are
configured in the IP Profile table (see ''Configuring IP Profiles'' on page 314). When
this occurs, the device sends a SIP 480 (Temporarily Unavailable) response to the
SIP entity.

806 Media Limits Exceeded: The device generates this response code when the call
is terminated due to crossed thresholds of QoE metrics such as MOS, packet delay,
and packet loss (configured in the Quality of Experience Profile table) and/or media
bandwidth (configured in the Bandwidth profile table). When this occurs, the device
sends a SIP 480 (Temporarily Unavailable) response to the SIP entity. This is
configured by 1) assigning an IP Group a QoE and/or Bandwidth profile that rejects
calls if the threshold is crossed, 2) configuring 806 in the Reasons for Tel-to-IP
Alternative Routing table and 3) configuring an alternative routing rule.
Note:
used. This tone is played for a user-defined time, configured by the
AltRoutingToneDuration parameter.
Version 6.8
SIP OPTIONS failure
Poor QoS
SIP OPTIONS failure, poor QoS, or unresolved DNS
The device also plays a tone to the endpoint whenever an alternative route is
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28. Routing
Mediant 800B MSBR