A method for interface an IPABX and a local exchange includes the steps of: processing
a call originated from an IPABX by a local exchange having one discernible individual
by binding a plurality of data transmission lines, that is, a data transmission
line trunk group; and processing a call destined to the IPABX through the local
exchange. Since the directory number can be managed by a group name, stepping up
from the method for fixing the directory number to the line, the expense for the
line can be reduced. In addition, the problem of separation between the origination
line and the destination line as in the conventional method that the trunk line
and the PRI line are together used is settled. Moreover, since there is no need
to allocate an additional signaling point, an expense possibly incurred for the
allocation of a signaling point and consumption of the signaling point resource
can be prevented.
