156, Ring-On, Ring-Off | Multi-Tech Systems MVP-410ST/810ST instruction

Technical Configuration (T1/E1)				MultiVOIP User Guide

		T1 Parameter Definitions (cont’d)
		T1 Parameter Definitions (cont’d)

	Field Name		Values	Description

	CAS Protocol		E&M Immed Strt	Channel Associated Signaling
			E&M Wink Start	(CAS) is a method of
			E&M Wink with	incorporating telephony
			dial tone	signaling info into a T1
			FXO Ground Strt	voice/data stream. In CAS, the
			FXO Ground Strt	signaling bits (the A, B, C, and
			FXO Loop Start	signaling bits (the A, B, C, and
			FXO Loop Start	D bits) are multiplexed into the
			FXS Ground Strt	D bits) are multiplexed into the
			FXS Ground Strt	signal stream of each T1
			FXS Loop Start	signal stream of each T1
			FXS Loop Start	channel. (By contrast, in
				channel. (By contrast, in
				Common Channel Signaling
				(CCS), one channel handles
				signaling for all other channels.)
				Each CAS protocol defines the
				states of the signaling bits
				during the various stages of a
				call (IDLE, SEIZED, ANSWER,
				RING-ON, RING-OFF).
				The CAS protocol code allows
				the VOIP to interact properly
				with the PBX or central-office
				switch that it serves. The need
				to download CAS protocols
				arises for only a small minority
				of VOIP users, and only when
				PBX/switch is found to be
				incompatible with standard
				protocols.
				Match this parameter to the
				setting of PBX or central-office
				switch.

Multi-Tech Systems MVP-410ST/810ST, MVP-130/130FXS, MVP-2410/3010 manual 156, Ring-On, Ring-Off