| B-channel service messages can not be turned off for an NTNAPRI.
The B-channel service messages are used to communicate B-channel states (i.e. call processing busy, idle, manually busy).
When NI-2 was developed, B-channel service messages were not required/omitted from the spec. NI-2 uses algorithms to determine channel states. Nortel left the B-channel services messages as an option with the option in the on state as the default.
For an NTNAPRI which is similar to NI-1 (though not exactly), the B-channel service messages are always required and thus can not be turned off. |