Multitech MultiVOIP 100 MVP110 User Manual page 10

Chapter 1 - Introduction and Description
or are you going to control your call sessions using the proprietary phone book. The H.323
Gatekeeper acts as the central point for all calls within its zone and provides call control services to
registered endpoints. If you choose the proprietary phone book, you establish a master-slave
relationship where the master MultiVOIP maintains the phone directory and downloads the directory
to each slave unit.
The decision on building the phone directory database is contained in the Phone Directory Database
dialog box. Before you choose how the data base is going to be used, here are a couple of things to
keep in mind; (1) If a Gatekeeper is employed in the network, you need to choose the Gatekeeper
option. You can not mix the Proprietary PhoneBook with the Gatekeeper. If you choose the
Gatekeeper option you can communicate with other third party endpoints that support H.323 (such as
Microsoft Netmeeting). (2) If you choose the Proprietary PhoneBook, you establish a master-slave
relationship in which the master MultiVOIP maintains the phone directory database. All of the phone
numbers are listed in the data base so that if you want to communicate with someone in your VOIP
network, you can see the phone number in your data base. Everytime you bring up your MultiVOIP
the current phone directory is downloaded to your MultiVOIP.
The Gatekeeper is a separate application that can operate on a network pc and provides all the
controls needed to create, control, and manage an H.323 network zone. The H.323 network zone is
all the endpoints (terminals and gateways (MultiVOIPs)) that are registered with the gatekeeper. The
gatekeeper functions are address translation from LAN aliases for terminals and gateways to IP
addresses as defined in the RAS (Registration/Admission/Status) specification. The RAS Protocol
defines the communication with a gatekeeper and support for RTP/RTCP for sequencing audio
packets. The H.323 Gatekeeper also provides call-authorization for both accepting and placing calls
in its zone, and certain monitoring features such as call permissioning and address resolution.
If you choose the Gatekeeper option, initially you need to communicate with the administrator of the
Gatekeeper to register your MultiVOIP. The information you need from the Gatekeeper administrator
is the IP address of the Gatekeeper and its port number. Then you need to establish your alias
address which includes phone number, channel number, H323 ID which is a name, and your
MultiVOIP LAN IP address. The port number is 1720, but if the Gatekeeper uses a different port
number, you have to ensure that you use the same port number. The Gatekeeper administrator will
then enter your information into the Gatekeeper data base. This concludes the preregisteration.
You can enter your alias address information into the Add/Edit Phone Entry dialog box. For example,
if you were setting up the corporate MultiVOIP, you could enter the following information for the Voice/
Fax Channel. For instance, in our typical application channel 1 of the corporate MultiVOIP uses
extension 101. The Description is optional, but can be helpful if you assigned to a particular
individual or department, or in this case it defines the channel interface.
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