Avaya 1600 Series Administrator's Manual page 76

Administering Telephone Options
Note:
In all cases, the values you administer are the values relevant to the location of
Note:
the Avaya Media Server at which the IP telephones are registered. If a telephone
is in Japan, but its media server is in the United States, set the PHNCC value to
"1" for the United States.
In all cases, the digits the telephones insert and dial are subject to standard
Avaya Media Server features and administration. This includes Class of Service
(COS), Class of Restriction (COR), Automatic Route Selection (ARS), and so on.
As indicated in
ENHDIALSTAT to turn off the Enhanced Local Dialing feature.
76 1600 Series IP Telephone Administrator Guide Release 1.0
Table 7, you can administer the system parameter