Installation > Network Installation > Distribute Client Setup > cdcconfig.dat - node [ClientConfigExt]:
IPProviderPostfix
Postfix which is added at the end of a phone number for outgoing calls - see TAPI configuration
Default value: Empty
Page url: http://www.helpserver.biz/onlinehelp/cdc/ep/3.0/help2000/index.html?config_ipproviderpostfix.htm