2.2.7. Traffic Considerations 
From a trafficking point of view, HG 3500 IP line gateways can be
treated like a trunk with either 60 or 120 connections. The number of
connections required depends on the number of IP phones configured per
HG 3500 and the traffic (C.C.S.) values of these phones. Using a standard
ErlangB calculation allows determining the number of trunks/connections
that are required on each gateway for a specific configuration.
The tools use a simplified approach and allow 240 standard users and
60/120 high traffic (e.g. call center agents) users on each gateway type.
Note that you can mix and match standard and high traffic users but you
will be limited to 60/120 users per gateway total. This ensures that
call center agents will always be able to seize a line.
Capacities
A maximum of 240 IP clients can be configured per HG 3500 gateway.
Typically a 60 connections gateway is sufficient to serve 240 at 6
C.C.S. In case the users creating a higher amount of traffic, then a
120 connections gateway will be required.
Call center agents are typically trafficked at 32 C.C.S. and thus
require a connection on the gateway for each agents. This will limit
the number of call center agents to 60 or 120 depending on the HG 3500
type (60/120 connections).
IMPORTANT:
Mixing of regular users and call center agents
on the same card is possible. However, in order to guarantee connection
availability to call center agents at all times, regular users will be
trafficked at 1 Erlang (36 C.C.S.)