Extended Telephony Services Functions

The following tables list by category the extended telephony functions for both line and phone devices.

Extended Line Services

lineNegotiateExtVersion	Allows an application to negotiate an extension version to use with the specified line device. Asynchronous.
lineDevSpecific	Device-specific escape function. Synchronous.
lineDevSpecificFeature	Device-specific escape function to allow sending switch features to the switch. Asynchronous.

Extended Phone Services

phoneDevSpecific	Device-specific escape function to allow vendor-dependent extensions. Asynchronous.
PhoneNegotiateExtVersion	Allows an application to negotiate an extension version to use with the specified phone device. Synchronous.

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