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Some data networks include equipment that can perform UDP port selection. This is a mechanism that gives packets with port numbers in a given range priority over packets with port numbers outside that range.
To support UDP port selection, the 4600 Series IP Telephones can be administered from the Avaya Communication Manager Network Region form. Locate specific implementation details for local administration of MCPORT in the 4600 Series IP Telephone Installation Guide. For Avaya Communication Manager administration, find implementation details in Administration for Network Connectivity for Avaya Communication Manager Software. In summary, the system value MCPORT represents the port on the TN2302AP circuit pack. Use this port number to administer routers, etc. supporting UDP port selection, to maximize priority of voice packets being exchanged between the PBX and the telephone.
The default value for MCPORT is 1719. Administer the switch to use a port within the proper range for the specific LAN, and the IP telephone(s) will copy that port. A related parameter is PORTAUD, which is the RTP port used by the switch. If no UDP port range is administered on the switch, the IP telephone uses an even-numbered port, randomly selected from the interval 4000 to 10000.
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