This attribute specifies a unique indentifier for each end of a PVC. It
that may be used by downstream processing systems to correlate
accounting records issued at different nodes in the network. The
attribute can be up to 32 bytes long. If it is less than 32 bytes, it is
zero filled on the right to create a 32 byte value. The resulting value
is recorded in the attribute callConnId for this PVC's ATM
accounting records.
If the attribute is a null string then this PVC does not have any
accounting records generated for it.