Talkaphone VOIP-8 VoIP Interface (8 channels) - Manual (Page 12)

VOICE OVER IP INTERFACE
Installation and Operation Manual
12
VoIP System Design
Before you begin programming the VOIP Interface units, it is recommended that you plan out your system
layout. You should begin by choosing a setup type. There are two basic types of VoIP setups we can
design for an emergency phone system:
Figure 1-12: One-to-One Configuration
(1) The first setup type is a one-to-one configuration. In this scenario, each emergency phone has
its own PBX extension or phone line. The number of calls that the head end is capable of receiving
is equal to the number of emergency phones in the field.
Figure 1-13: Many-to-One Configuration
(2) The second setup type is a many-to-one configuration. In this scenario, many Emergency Phones
share PBX extensions or phone lines. The number of calls that the head end is capable of receiving is
less than the number of emergency phones in the field.
Once you have chosen a setup type, it is recommended that you assign phone numbers/PBX extensions
to the emergency phones and IP addresses to the VOIP units before programming any of the VOIP units.
Keep in mind that the PBX extension assignments are separate from the VOIP phone book extensions.
Please reference Phone Book Design (p. 18) for more information.
When designing your system layout, please keep in mind that All VOIP units must have fixed IP
addresses. Also, ensure that the proper routing and switching hardware (routers, hubs, firewalls, VPNs,
etc.) are in place for the VOIP units to communicate. It is critical that ensure network reliability, which
includes sufficient bandwidth and minimizes packet loss and packet delays.
IMPORTANT NOTE: For the Emergency Phone System to work through a power outage, all components of
the data path (i.e. the VOIP units, routers, hubs, switches, etc.) must be on back-up power.