The information regarding a single Media Mail call leg.
The call leg entry is identified by using the same index
objects that are used by Call Active table of IETF Dial
Control MIB to identify the call.
An entry of this table is created when its associated call
history entry in the IETF Dial Control MIB is created and
the call history entry contains information for the call
establishment to the mail server on the IP network via a
Media Mail over IP peer.
The entry is deleted when its associated call history entry
in the IETF Dial Control MIB is deleted.