This table contains information about ports.
When the network management subsystem implements this MIB, this
table lists all the ports associated with the call agents listed
in cvcCallAgentTable.
When systems other than those hosting call agents implement this
MIB, this table will contain information of all the ports of the
system,associated with the call agents listed in cvcCallAgentTable.
The network management subsystem adds conceptual rows to this table
for every port associated to call agent.