Specifications

Managing Remote Access Options
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ShoreTel Mobility Router Administration Guide 55
Options
Call Admission Control
Use Call Admission Control (CAC) to define the thresholds for Secure Remote Voice calls and to
prevent overloading the enterprise WAN connection. An Administrator can allocate maximum amount
of available bandwidth for Secure Remote voice traffic as well as restrict the maximum number of
simultaneous voice calls allowed through the secure remote access. When the Secure Remote
Access Bandwidth limit is reached or number of simultaneous call limit is reached, the ShoreTel
Mobility Router does not accept new VoIP calls from remote clients. If a remote client attempts to make
a VoIP call when there is no available bandwidth to support the new call, the ShoreTel Mobility Router
instructs the client to place the call through the cellular voice interface. Similarly, when the ShoreTel
Mobility Router receives a call destined to a Remote access client when there is no available resource
to handle that call through secure remote voice, it routes the call to the client through the cellular voice
network.
CAC can be enforced either on the amount of allocated secure remote access bandwidth, or on the
number of simultaneous SRV calls, or on both. If “both” is selected, the restriction applies as soon as
either the bandwidth or the calls limit is reached. The value of bandwidth is specified in kpbs (Kilobits
per second) and the bandwidth represents unidirectional bandwidth. The restriction is imposed when
either receive or transmit bandwidth reaches the specified limit. Default value of bandwidth is 1500
kpbs.
Maximum secure remote voice call applies the call limit to the SRV calls. Default value is 100.
If CAC is not enabled, there is no limitation on the number of calls or network bandwidth used by the
SRV calls.
Enabling Call Admission Control
To enable Call Admission Control:
1. Select Configuration > System > Networking > Remote Access > Options tab.