User's Manual 356 Document #: LTRT-42060
Mediant 2600 E-SBC
In this setup, the SRD offers a shared pool for unreserved call capacity of 10 [i.e., 40 – (10
+ 20)]. If IP Group ID 1 needs to handle 15 calls, it is guaranteed 10 calls and the
remaining 5 is provided from the SRD's shared pool. If the SDR's shared pool is currently
empty and resources for new calls are required, the quota is taken from the device's total
capacity, if available. For example, if IP Group ID 1 needs to handle 21 calls, it's
guaranteed 10, the SRD's shared pool provides another 10, and the last call is provided
from the device's total call capacity support (e.g., of 200).
Requests that reach the user-defined call limit (maximum concurrent calls and/or call rate)
are sent to an alternative route, if configured in the IP-to-IP Routing table. If no alternative
routing rule is located, the device rejects the SIP request with a SIP 480 "Temporarily
Unavailable" response.
Note: The device applies the CAC rule for the incoming leg immediately after the
Classification process. If the call/request is rejected at this stage, no routing is
performed. The enforcement for the outgoing leg is performed within each alternative
route iteration. This is accessed from two places: one during initial
classification/routing, and another during alternative routing process.
The following procedure describes how to configure CAC rules in the Web interface. You
can also configure CAC rules using the table ini file parameter, SBCAdmissionControl or
CLI command, configure voip > sbc sbc-admission-control.
To configure a CAC rule:
1. Open the Admission Control page (Configuration tab > VoIP menu > SBC >
Admission Control).
2. Click Add; the following dialog box appears:
Figure 21-3: Admission Control Page - Add Record Dialog Box
3. Configure an Admission Control rule according to the parameters described in the
table below.
4. Click Submit, and then save ("burn") your settings to flash memory.
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