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Some data networks include equipment that can perform UDP port selection. This is a mechanism by which packets with port numbers in a given range are given priority over packets with port numbers outside that range.
To support UDP port selection, the 4600 Series IP Telephones can be administered either from the network via appropriate administration of the DHCP or TFTP servers, or at the telephone itself via dialpad input. Specific implementation details for local administration are in the 4600 Series IP Telephone Installation Guide, and, for remote administration, in 4600 Series IP Telephone Scripts and Application Files. In summary, the system value MCPORT represents the port on the TN2302AP board. This port number can be used to administer routers, etc. that support UDP port selection, to maximize the priority given to the voice packets being exchanged between the PBX and the telephone.
The default value for MCPORT is 1719. The switch must be administered 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. In accordance with standards RFC 1889 and 1890, the IP Telephone uses a default value for PORTAUD of 5004. MCPORT and PORTAUD are both administrable (see Administering Options for the 4600 Series IP Telephones).
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