Multi-Tech Systems MVP103, 410 manual Version 4 Parameters

Chapter 3 – Related MultiVOIP Setup Parameters

Communication Manager Parameter Definitions (cont’d)

Field Name	Values		Description
RAS Time to	Numeric		The MultiVOIP sends this value to CM in the Registration Request
Live	(in seconds)		(RRQ). However, the MultiVOIP will send “Keepalive” RRQs based
			on the TTL received from CM during Registration Confirm (RCF)
Enable	Y/N		Enable/disable MultiVOIP’s Gateway Survivable mode wherein
Survivability			MultiVOIP manages its own IP traffic using its inbound and
Mode			outbound phonebooks in the event of failure of the primary, alternate
			#1 and #2 gatekeepers (if alternates are present).
Switching	numeric		When MultiVOIP is in “gateway” survivable mode meaning the
Time Interval	(in seconds)		Communication Manager gatekeeper to which it is registered failed
			(along with any alternate gatekeepers providing redundancy), the
			MultiVOIP manages IP phone traffic with its own phonebooks. It
			will seek to return to being controlled by the Communication
			Manager gatekeeper. The Switching Time Interval determines how
			often it will seek to restore its registration with the primary
			Communication Manager gatekeeper.
		H.323 Version 4 Parameters
Q.931	Y/N		Signaling for multiple phone calls can be carried on a single port
Multiplexing			rather than opening a separate signaling port for each call. This
(Mux)			conserves bandwidth resources.
			If “Register with Communication Manager Gatekeeper” is enabled, this
			field defaults to “Y” for FXO/DID ports and to “N” for FXS ports
			and it cannot be changed.
H.245	Y/N		H.245 messages are encapsulated within the Q.931 call-signaling
Tunneling			channel. Among other things, the H.245 messages let the two
(Tun)			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.
			If “Register with Communication Manager Gatekeeper” is enabled, this
			field defaults to “Y” for FXS and FXO ports and cannot be changed.
		H.323 Version 4 Parameters
Parallel H.245	Y/N		FS (Fast Start or Fast Connect) is a Q.931 feature of H.323v2 to
(FS + Tun)			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).
			If “Register with Communication Manager Gatekeeper” is enabled, this
			field defaults to “N” for FXS and FXO ports and cannot be changed.
Annex –E (AE)	Y/N		Multiplexed UDP call signaling transport. Annex E is helpful for
			high-volumeVOIP 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.)
			If “Register with Communication Manager Gatekeeper” is enabled, this
			field defaults to “N” for FXS and FXO ports and cannot be changed.

Multi-Tech Systems, Inc. Avaya Communication Manager Guide 35