User guide

Chapter 1 - Introduction and Description

option. You can not mix the Proprietary PhoneBook with the Gatekeeper. If you choose the

Gatekeeper option, interoperability is less of a concern and you can communicate with other third

party endpoints that support H.323 (e.g., Microsoft Netmeeting). (2) If you choose the Proprietary

PhoneBook, you establish a master-slave relationship in that 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 register 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/TRCP for sequencing audio

packets. The H.323 Gatekeeper also provides call-authorization for both accepting and placing calls

in its zone, handles hunting (call-rollover), and certain monitoring features (i.e., call permissioning

and address resolution).

So, if you choose the Gatekeeper option, initially you need to communicate with the administrator of

the Gatekeeper to preregister 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, e-mail

like address, etc, 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.

Now, 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

Voice Channel 1. For instance, in our typical application channel 1 of the Corporate MultiVOIP uses

extension 101. The Description is optional, but can be helpful if it is assigned to a particular individual

or department, or in this case it defines the channel interface. The H323 ID that was assigned to this

phone number is an e-mail like address which identifies the individual that is using this extension and

the domain name of the Gatekeeper (in this example corporatehd). The IP Address of the Corporate

MultiVOIP is 201.022.122.118 and the default port number 1720 is used.

So now when you “come alive”, the Gatekeeper will register you with the above alias address. No

other H323 endpoint can use this alias. This is like your own telephone number.

Now, if you choose the Proprietary PhoneBook option in the Phone Directory Database dialog box

instead of the Gatekeeper option, the Database Type group would become active and the RAS

Parameters group is inactive (greyed out).