17.54. NPUN - Numbering Plan UNKNOWN on outgoing trunk calls 
Feature:
This COT describes, that the next node can use numbers in Numbering plan UNKNOWN to
reach
this physical node. In general, this is a indication, that the switches at both ends
of the
trunk use numbering plan UNKNOWN for networking.
Function:
In more detail, is used to determine the NPI for sending redirection parties in case
of set
COT parameter AULN, RWSN, if the NPI can not be determined from the redirection party
itself. E.g. A user B in switch 1 programms an internal CF by entering the extension
of the
redirection number only (normal case). If a user A in switch 2 calls B, networking
must
modify the redirection number in a way, that switch 2 can use this number to reach
B. This
COT defines, what NPI is used to sent the redirection party is from switch 1 to switch
2.
AMO-Interrelationships:
Only one of the 3 COT parameters NPPR,NPIS, NPUN must be set. If none of the 3 COT
parameters is set, the system behaves as if NPUN was set. This COT is only relevant,
if COT
RWSL, AULN set. If incorrectly set: CF is not executed!
Device type:
Applicable to all digital trunks with outgoing calls
Protocol variants:
Applicable to all digital protocols