Multi-Tech Systems MULTIVOIP MVP210/410/810 - Manual (Page 77)

Multi-Tech Systems, Inc. 77
Chapter 5 – Phone Book Configuration
Introduction
When a VOIP serves a PBX system, it’s important that the operation of the VOIP be transparent to the telephone
end user. That is, the VOIP should not entail the dialing of extra digits to reach users elsewhere on the network
that the VOIP serves. On the contrary, VOIP service more commonly reduces dialed digits by allowing users
(served by PBXs in facilities in distant cities) to dial their co-workers with 3-, 4-, or 5-digit extensions as if they
were in the same facility.
Furthermore, the setup of the VOIP generally should allow users to make calls on a non-toll basis to any numbers
accessible without toll by users at all other locations on the VOIP system. Consider, for example, a company
with VOIP-equipped offices in New York, Miami, and Los Angeles, each served by its own PBX. When the VOIP
phone books are set correctly, personnel in the Miami office should be able to make calls without toll not only to
the company’s offices in New York and Los Angeles, but also to any number that’s local in those two cities.
To achieve transparency of the VOIP telephony system and to give full access to all types of non-toll calls made
possible by the VOIP system, the VOIP administrator must properly configure the “Outbound” and “Inbound”
phone-books of each VOIP in the system.
The “Outbound” phonebook for a particular VOIP unit describes the dialing sequences required for a call to
originate locally (typically in a PBX in a particular facility) and reach any of its possible destinations at remote
VOIP sites, including non-toll calls completed in the PSTN at the remote site.
The “Inbound” phonebook for a particular VOIP unit describes the dialing sequences required for a call to
originate remotely from any other VOIP sites in the system, and to terminate on that particular VOIP.
Briefly stated, the MultiVOIP’s Outbound phonebook lists the phone stations it can call; its Inbound phonebook
describes the dialing sequences that can be used to call that MultiVOIP and how those calls will be directed. The
phone numbers are not literally “listed” individually, but are, instead, described by rule.
Identify Remote VOIP Site to Call
When you’re done installing the MultiVOIP, you’ll want to confirm that it is configured and operating properly. To
do so, it’s good to have another VOIP that you can call for testing purposes. You’ll want to confirm end-to-end
connectivity. You’ll need IP and telephone information about that remote site.
If this is the very first VOIP in the system, you’ll want to coordinate the installation of this MultiVOIP with an
installation of another unit at a remote site.
Identify VOIP Protocol to be Used
Will you use H.323, SIP, or SPP? Each has advantages and disadvantages. Although it is possible to mix
protocols in a single VOIP system, it is highly desirable to use the same VOIP protocol for all VOIP units in the
system. SPP is a non-standard protocol developed by Multi-Tech. SPP is not compatible with the “Proprietary”
protocol used in Multi-Tech’s earlier generation of VOIP gateways. The –SS series of MultiVOIPs only support the
SIP protocol. The –FX models do not support H.323.