For voice boards with on-board analog devices (D/41ESC, D/160SC-LS and VFX/40ESC boards), a voice device and an analog device comprise a single channel. Although these devices can be addressed separately, all analog signaling is processed by the associated voice device; analog signaling (ring detection and loop current detection) events are not transmitted over the SCbus.
For example, a call received by an analog channel on a D/160SC-LS board can be routed to a fax channel on a VFX/40ESC board or to another resource device. However, the fax channel or other resource device will not receive any analog signaling events. Signaling events will only be received by the D/160SC-LS voice channel associated with that analog channel. Voice devices on analog loop-start interface boards and their associated analog devices can be used separately, but should be used mutually exclusively.
Because of the analog signaling between on-board voice and analog devices, at system initialization default SCbus routing connects corresponding analog and voice device pairs (analog device 1 to voice device 1, etc.) in full duplex communications. These receive (listen) channel assignments can be changed by the application at any time.
When a D/41ESC or a VFX/40ESC board is configured as a resource device, the analog devices on that board will be disabled. This configuration is typically used for fax or voice sharing applications.
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