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Each Trunk Group can have a Media Port Range configured that indicates a range of values to use when allocating UDP ports. To provision a UDP media port range slightly larger than the actual count of ports ostensibly required to support the maximum simultaneous calls (not applicable to TCP media). The system reserves two UDP ports for each incoming UDP media call leg: one for (S)RTP and one for (S)RTCP. Thus, a configured port range must contain at least twice as many port numbers as the maximum simultaneous calls to be supported for that IPTG (not applicable to TCP media).
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