Toshiba Strata CTX, Programming Manual, Page: 215 / 533

Services
Networking
Strata CTX Programming - Part 2: CTX WinAdmin Programming 04/03
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Serv
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Digit Manipulation
Digit Manipulation is the term for the altering of an original string of dialed digits in order to re-route a call
or connect it to a specific service. Digit Manipulation is usually applied to the leading digits in the string
which appear left-most in written form. Strata Net uses two forms of manipulation: Overlap Codes,
described above, for inbound calls and Network Digit Modification Tables for outbound calls. The
Network Digit Modification Tables contain up to 64 treatments in each of which as many as 10 leading
digits may be deleted and as many as 23 leading digits substituted. These 64 treatments may be applied to
any of 64 Route Definitions.
Traveling Class Mark
Calling privileges, restrictions and priorities may be imposed across Strata Net using the Traveling Class
Mark. The Traveling Class Mark accompanies all calls across the network. When the call reaches its
terminating node, that node uses the Traveling Class Mark to determine whether the originator of the call is
entitled to the dialed facility. The mark is a single information element linked from the following:
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Network Class of Service
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Network DR Level
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Network Facility Restriction Level
•
Network Queuing Priority Level
All nodes contain tables to translate between local and network DR Levels, Facility Restriction Levels and
Queuing Priority Levels. DRL, FRL and QPL each require two tables: one to translate from the local level
to the network level for outgoing calls and one to translate from network to local level for incoming calls.
Network Class of Service is an exception for two reasons. First, at the originating node, each station is
assigned a Network Class of Service; there is no translation. The terminating node does contain a table to
translate the received Network Class of Service to a local Class of Service but it adds parameters to the
local Class of Service before determining how to process the call. Those parameters are:
•
Permission for Off-Hook Call Announce
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Ability to register System Speed Dial numbers in the terminating node
•
Ability to register Class of Service Override in the terminating node and
•
Trunk Group Override Access
Time of day considerations are handled at the originating node. If a call originates in a node that is in Night
Mode and terminates in another node, it will deliver the Night Mode values regardless of the condition of
the terminating node.
Path Replacement
Known also as Route Optimization and Release Link, Path Replacement makes the most efficient use of
talk paths between network nodes. For example, if a series of transfers around the network results in a
conversation between two stations in the same node, all of the tie line circuits are released and a simple
station-to-station call is established in the one node. This efficiency reduces the number of facilities to be
provided and improves transmission quality by minimizing the number of links over which loss could
occur.
Path Replacement applies to:
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Call Transfer
•
Ring Transfer
•
Station Call Forward
•
System Call Forward