User's Manual 378 Document #: LTRT-42060
Mediant 2600 E-SBC
Parameter Description
CLI: group-policy
[IP2IPRouting_GroupPolicy]
Defines whether the routing rule includes call forking.
[0] None (default) = Call uses only this route (even if
Forking Group members are configured in the rows below
it).
[1] Forking = Call uses this route and the routes of
Forking Group members, if configured (in the rows below
it).
Note:
Each Forking Group can contain up to 20 members. In
other words, up to 20 routing rules can be configured for the
same Forking Group.
Cost Group
[IP2IPRouting_CostGroup]
CLI: cost-group
Assigns a Cost Group to the routing rule for determining the
cost of the call. To configure Cost Groups, see ''Configuring
Cost Groups'' on page 226.
By default, no Cost Group is defined.
21.5.4 Configuring SIP Response Codes for Alternative Routing
Reasons
The SBC Alternative Routing Reasons table lets you configure up to 20 SIP response
codes for call release (termination) reasons. If a call (outgoing SIP dialog-initiating
methods, e.g., INVITE, OPTIONS, and SUBSCRIBE messages) is released as a result of a
configured SIP code (provided in SIP 4xx, 5xx, and 6xx), the device does alternative
routing as follows: If the destination Proxy Set is configured with multiple IP addresses (see
Configuring Proxy Sets on page 269), the device first attempts to route the call to one of
these IP addresses, starting with the first listed address. If unsuccessful, the device then
searches for an alternative routing rule in the IP-to-IP Routing table (see 'Configuring SBC
IP-to-IP Routing Rules' on page 368).
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). Alternative routing is only done if you have
configured this response code in the SBC Alternative Routing Reasons table.
You can also configure alternative routing for the following proprietary response codes, if
configured in the table, which are issued by the device itself:
805 IP Profile Call Limit: The device generates this response code when Call
Admission Control (CAC) limits (such as 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
355). 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 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 SBC Alternative Routing
Reasons table and 3) configuring an alternative routing rule.
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