J3 Line Provisioning--ISDN Ordering Codes (IOC)--(previously 'Generic Data J_1DN')ISDN ordering codes (IOC) allow customers to order, via a simple code, pre-configured packages of ISDN features and services.
-Alternate voice and data on one B channel, data only on the other B channel,
-One directory number.
J3 is not available on the Northern Telecom (DMS-100) switch. Since two directory numbers are required for 2B operation, use J2.