Avaya Communication Manager Administrator's Manual page 728

Screen Reference
ITC (Information Transfer Capability)
This field is used to determine the type of transmission facilities to be used for ISDN calls
originating from this endpoint. Displays when the Communication Type field is 56k-data,
64k-data, or Wideband.
When adding an access endpoint with the ITC administered as unrestricted, its associated port
has to be a channel of a DS1 circuit pack with the Zero Code Suppression field administered
as B8ZS. If the port is not a channel of a DS1 circuit pack with its Zero Code Suppression field
administered as B8ZS, the end validation fails and the screen submission is rejected. The
cursor is moved to ITC with the following error message:
An unrestricted access endpoint can only be from B8ZS DS1 circuit pack.
When adding an access endpoint with the ITC administered as restricted, its associated port
can be a channel from a DS1 circuit pack with the Zero Code Suppression field administered
as ZCS or B8ZS.
For an existing access endpoint, ITC can only be changed from restricted to unrestricted if its
associated port is a channel of a DS1 circuit pack with its Zero Code Suppression field
administered as B8ZS. If the port is not a channel of a DS1 circuit pack with its Zero Code
Suppression field administered as B8ZS, the end validation fails and the screen submission is
rejected. The cursor is moved to ITC with the following error message:
An unrestricted access endpoint can use only B8ZS DS1 circuit pack
Without this end validation, a user could administer an access endpoint as unrestricted when in
fact it is restricted, that is, its associated port is a member of a DS1 circuit pack that uses ZCS
data transmission.
Valid entries
unrestricted
restricted
Name
Enter an name for the endpoint.
728 Administrator Guide for Avaya Communication Manager
Usage
When unrestricted, only unrestricted transmission facilities (b8zs) will be
used to complete the call. An unrestricted facility is a transmission facility
that does not enforce 1's density digital transmission (that is, digital
information is sent exactly as is).
For Wideband Access Endpoints, enter unrestricted.
When restricted, either restricted (zcs-ami) or unrestricted transmission
facilities is used to complete the call. A restricted facility is a transmission
facility that enforces 1's density digital transmission (that is, a sequence of
eight digital zeros is converted to a sequence of seven zeros and a digital
one) via zcs coding on DS1 circuit pack.