Toshiba DK424I 用户手册

The facility code and service parameters will be supplied by the ISDN carrier at the time the ISDN 
lines are ordered. Standard telephone services (POTS) will not have a Facility Code, nor a Service 
Parameter.

The Call-by-call feature enables individual PRI B-channels to be shared among various types of 
services specified by the customer, rather than having to dedicate each channel to a particular type 
of service. The Call-by-Call feature can reduce the number of circuits required to access various 
services, especially if various services have different peak busy periods. 

In release 4.15 and higher, the minimum and maximum number of B-channels allocatable to any 
type of service can be assigned. Each of these values can be set for three time periods during the 
day. With these values, calls can be rejected if they exceed the maximum number subscribed for 
that service or they can ensure that a minimum number of channels remain available for incoming 
calls. Thus, the system can be used to provide an optimum service to meet the objectives of the 
business.

Call-by-Call services can be specified to map Strata DK capabilities to network services such as 
DID, Tie, FX, WATS, 800, etc. These services could be provided via the local telephone carrier or 
be connected to any ISDN inter-exchange carrier. 

A table listing all valid DNs is provided for identifying the outgoing calls or alternatively a 
specific number or DID number. These may be used for identifying the call on a per station basis 
to allow calls to be billed to a selected service or station. All numbers used for identifying the call 
must be subscribed from the providing service or the call will be rejected by the provider.

✱ ✱  ✱ ✱  6SNU ✱   + ROG  6SNU 

+ ROG  6SNU   +ROG  6SNU   +ROG

SV = Service Parameters

Enter ISDN Trunk Group

FA = Enter the Facility Code

SEL = 2