AudioCodes Mediant 800B User Manual page 678

SIP response code 408 (Request Timeout). Alternative routing is only done if you have
configured the response code in the Alternative Routing Reasons table.
You can also configure alternative routing for the following proprietary response codes, if
configured in the table, that are issued by the device itself:

805 IP Profile Call Limit: The device generates the response code when Call
Admission Control (CAC) limits (e.g., maximum concurrent calls) are exceeded for an
IP Group (or SRD). The CAC rules are configured in the Admission Control table (see
'Configuring Admission Control' on page 653). When this occurs, the device sends a
SIP 480 (Temporarily Unavailable) response to the SIP entity. In such a scenario, an
alternative route configured in the IP-to-IP Routing table can be used.

806 Media Limits Exceeded: The device generates the response code when the call
is terminated due to crossed user-defined thresholds of QoE metrics such as MOS,
packet delay, and packet loss (see 'Configuring Quality of Experience Profiles' on
page 307) and/or media bandwidth (see 'Configuring Bandwidth Profiles' on page
312). 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 Alternative Routing Reasons table and 3) configuring an alternative routing
rule.
The device also generates the response code when it rejects a call based on Quality
of Service rules due to crossed Voice Quality and Bandwidth thresholds (see
'Configuring Quality of Service Rules' on page 315). If the response code is configured
in the table and the device rejects a call due to threshold crossing, it searches in the
IP-to-IP Routing table for an alternative routing rule.

818 Signalling Limits Exceeded: The device generates the response code when it
rejects a call based on Quality of Service rules due to crossed ASR, NER or ACD
thresholds (see 'Configuring Quality of Service Rules' on page 315). If the response
code is configured in the table and the device rejects a call due to threshold crossing,
it searches in the IP-to-IP Routing table for an alternative routing rule.
Note:
•
If the device receives a SIP 408 response, an ICMP message, or no response,
alternative routing is still performed even if the code is not configured in the
Alternative Routing Reasons table.
•
SIP requests belonging to an SRD or IP Group that have reached the call limit
(maximum concurrent calls and/or call rate) as configured in the Call Admission
table are sent to an alternative route if configured in the IP-to-IP Routing table for
the SRD or IP Group. If no alternative routing rule is located, the device
automatically rejects the SIP request with a SIP 480 (Temporarily Unavailable)
response.
The following procedure describes how to configure the Alternative Routing Reasons table
through the
(SBCAlternativeRoutingReasons) or CLI (configure voip > sbc routing sbc-alt-routing-
reasons).

To configure SIP reason codes for alternative IP routing:
1. Open the Alternative Routing Reasons table (Setup menu > Signaling & Media tab >
SBC folder > Routing > Alternative Reasons).
User's Manual
Web interface. You
678
Mediant 800B Gateway & E-SBC
can also configure
Document #: LTRT-10298
it through ini file