User guide

Chapter 4—Configuring your VOIP
Multi-Tech Systems, Inc. 40
Call Signaling
There are three types of Call Signaling available: H.323, SIP and SPP. Each type has some individual features that
may make it more appealing to use than the others, depending on your needs.
H.323
H.323 is an ITU-T recommended set of standards for audio and video communications.
H.323 call signaling
Field Name
Values
Description
Use Fast Start
Y/N
Enables the H.323 Fast Start procedure. May need to be enabled / disabled for
compatibility with third-party VOIP gateways.
Signaling Port
port
Default: 1720 (H.323)
Register with
Gatekeeper
Y/N
Check this field to have traffic on current VOIP gateway controlled by a gatekeeper.
Allow Incoming
Calls Through
Gatekeeper Only
Y/N
When selected, incoming calls are accepted only if those calls come through the
gatekeeper.
GateKeeper RAS Parameters
Primary GK
--
This is the preferred gatekeeper for controlling the traffic of the current VOIP.
Alternate GK
1 and 2
--
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
n.n.n.n
IP address of the GateKeeper.
RAS Port
1719
Well-known port number for GateKeepers. Must match port number (1719).
Gatekeeper Name
alpha-
numeric
Optional. The name of the GateKeeper with which this MultiVOIP is trying to register. A
primary gatekeeper and two alternate units are listed.
RAS TTL Value
seconds
H.323 Gatekeeper Time to Live value. When the MultiVOIP gateway registers it starts a
gatekeeper a countdown timer. 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 to maintain the connection. If the MultiVOIP does not register before the
TTL interval expires, the MultiVOIP gateway’s registration with the gatekeeper expires
and the gatekeeper no longer permits call traffic to or from that gateway. Calls in
progress continue to function even if the gateway becomes de-registered
Gatekeeper
Discovery Polling
Interval
integer
60 - 300
The interval between the VOIP gateway’s successive attempts to connect to and be
governed by a higher level gatekeeper. The Primary GK is the highest level gatekeeper.
Alternate GK1 is second; Alternate GK2 is the lowest.