Multi-Tech Systems MVP-3010, MVP-2400, MVP-2410 manual 335

MultiVOIP User Guide			E1 PhoneBook Configuration
	PhoneBook Configuration Parameter Definitions
	(cont’d)
	Field Name	Values	Description
	H.323 Version 4 Parameters
	Q.931	Y/N	Signaling for multiple phone calls
	Multiplexing		can be carried on a single port
	(Mux)		rather than opening a separate
			signaling port for each call. This
			conserves bandwidth resources.
	H.245	Y/N	H.245 messages are encapsulated
	Tunneling (Tun)		within the Q.931 call-signaling
			channel. Among other things, the
			H.245 messages let the two
			endpoints tell each other what
			their technical capabilities are and
			determine who, during the call,
			will be the client and who the
			server. Tunneling is the process of
			transmitting these H.245 messages
			through the Q.931 channel. The
			same TCP/IP socket (or logical
			port) already being used for the
			Call Signaling Channel is then
			also used by the H.245 Control
			Channel. This encapsulation
			reduces the number of logical
			ports (sockets) needed and
			reduces call setup time.

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