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The call admission control with the call threshold global command does not block outbound calls from PSTN
The call admission control (CAC) does not disallow outbound calls with the call threshold global command, because it is designed to block inbound calls only.
Call admission control enables control over the audio quality and video quality of calls over a wide-area (IP WAN) link, because it limits the number of calls that are allowed on that link at the same time. For example, call admission control can be used in order to regulate the voice quality on a 56-kbps frame relay line that connects the main campus and a remote site.