Appeal No. 2005-2429 Page 6
Application No. 10/069,612
[W]here calls are placed digitally through the packet network, signaling
information may be sent to the NSP 46 along with control information
informing the NSP 46 that a virtual circuit for a call is requested. If it is a
voice call, a high priority must be given to the virtual circuit and the
NSP 46 must make sure the bandwidth is available. At the time a call is
made which is to be routed directly from the FMP 32 through the packet-
switched networks (e.g., SONET or ATM), the FMP 32 may be handling
data to and from the subscribers. At the time the request for a high priority
voice channel is made, the ISD 22 has already de-allocated bandwidth
assigned for data transmission to make room for the higher priority voice
transmission. The FMP 32 communicates the demand for high priority
bandwidth to the NSP 46 and the NSP 36 may deallocate bandwidth
formerly dedicated to data transmission (the same data for which
bandwidth was de-allocated by the ISD 22) as it, at the same time,
allocates bandwidth for the high priority call. This may involve a
transmission from the FMP 32 to the NSP 46 telling the NSP 46 that less
low-priority data bandwidth is needed in the current call and high priority
bandwidth is needed for the new voice call. The NSP 46 then responds
by allocating or identifying available circuits (virtual) and providing the
appropriate signaling.
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