Method and apparatus for routing blocked telephone calls
AssigneeSiemens Information and Communication Networks, Inc.
InventorsDAVID A. VANDER MEIDEN, LEROY E. GILBERT
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Abstract
A telecommunication system includes a private branch exchange (170) that uses an automatic route selection algorithm to select a trunk on which a call is to be routed. A number of trunk groups are queried for an available trunk and once an available trunk is located, the call is placed. The automatic route selection algorithm monitors the call to determine if an error message or error tone is received. If an error message or error tone is received, a set of remaining trunk groups not previously queried are queried for an available trunk to route the call.
Claims5
A telecommunication system, comprising:
- a private branch exchange that connects a call from a source telephone to a destination telephone over one of a number of trunk groups;
- and
- a central processing unit within the private branch exchange that selects one of the number of trunk groups to carry the call, the central processing unit monitoring the call for an error message and rerouting the call in response to the error message received.
Dependencies are inferred from the claim text.