Multi-Tech Systems MVP-3010, MVP-2400, MVP-2410 manual 287

MultiVOIP User Guide			T1 PhoneBook Configuration
	PhoneBook Configuration Parameter Definitions
		(cont’d)
	Field Name	Values	Description
	H.323 Version 4 Parameters
	Parallel H.245	Values: Y/N
	(FS + Tun)	Description: FS (Fast Start or Fast Connect) is a
		Q.931 feature of H.323v2 to hasten call setup as
		well as ‘pre-opening’ the media channel before
		the CONNECT message is sent. This pre-opening
		is a requirement for certain billing activities.
		Under Parallel H.245 FS + Tun, this Fast Connect
		feature can operate simultaneously with H.245
		Tunneling (see description above).
	Annex –E (AE)	Values: Y/N
		Description: Multiplexed UDP call signaling
		transport. Annex E is helpful for high-volume
		voip system endpoints. Gateways with lesser
		volume can afford to use TCP to establish calls.
		However, for larger volume endpoints, the call
		setup times and system resource usage under TCP
		can become problematic. Annex E allows
		endpoints to perform call-signaling functions
		under the UDP protocol, which involves
		substantially streamlined overhead. (This feature
		should not be used on the public Internet because
		of potential problems with security and bandwidth
		usage.)

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