Multitech MultiVOIP MVP210 User Manual page 54

Field Name
Use Fast Start
Signaling Port
Register with
Gatekeeper
Allow Incoming
Calls Through
Gatekeeper Only
GateKeeper RAS Parameters
Primary GK
Alternate GK
1 and 2
IP Address
RAS Port
Gatekeeper
Name
RAS TTL Value
Gatekeeper
Discovery Polling
Interval
Use Online
Alternate
Gatekeeper List
H.323 Version 4 Options
H.323
Multiplexing
H.245 Tunneling
(Tun)
Parallel H.245
(FS + Tun)
Annex –E (AE)
Multi-Tech Systems, Inc.
H.323 Call Signaling Parameter Definitions.
Values Description
Y/N Enables the H.323 Fast Start procedure. May need to be enabled/disabled for
compatibility with third-party VOIP gateways.
Default: 1720 (H.323)
port
Y/N Check this field to have traffic on current VOIP gateway controlled by a
gatekeeper.
Y/N When selected, incoming calls are accepted only if those calls come through the
gatekeeper.
-- This is the preferred gatekeeper for controlling the traffic of the current VOIP.
-- A first and a second alternate gatekeeper can be specified for use by the current
VOIP for situations where the Primary GK is busy or otherwise unavailable.
IP address of the GateKeeper.
n.n.n.n
1719 Well-known port number for GateKeepers. Must match port number (1719).
Optional. The name of the GateKeeper with which this MultiVOIP is trying to
alpha-
register. A primary gatekeeper and two alternate units are listed.
numeric
The H.323 Gatekeeper "Time to Live" value. As soon as a MultiVOIP gateway
seconds
registers with a gatekeeper a countdown timer begins. The RAS TTL Value is the
interval of the countdown timer. Before the TTL countdown expires, the MultiVOIP
gateway needs to register with the gatekeeper in order to maintain the
connection. If the MultiVOIP does not register before the TTL interval expires, the
MultiVOIP gateway's registration with the gatekeeper will expire and the
gatekeeper will no longer permit call traffic to or from that gateway. Calls in
progress will continue to function even if the gateway becomes de-registered
integer The interval between the VOIP gateway's successive attempts to connect to and
60 - 300 be governed by a higher level gatekeeper. The Primary GK is the highest level
gatekeeper. Alternate GK1 is second; Alternate GK2 is the lowest.
When selected, VOIP will seek an alternate gatekeeper (when none of the 3 gatekeepers
shown on this screen are available) from a list. The list will reside on the Primary gatekeeper
or one of the Alternate gatekeepers. The gatekeeper holding the list would download that list
onto the VOIP gateways within the system.
Y/N Signaling for multiple phone calls can be carried on a single port rather than
opening a separate signaling port for each. This conserves bandwidth resources.
Y/N H.245 messages are encapsulated 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.
Y/N FS (Fast Start) 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.
Y/N 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 due to potential problems with security and bandwidth usage).
Chapter 4: Configuring your VOIP
54