Technical data

Architecture and System Requirements
EN4442EN00EN_0002
© 2007 Siemens AG
Siemens
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2.6 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 GW is sufficient to serve 240 at 6 C.C.S.. In case the users creating
a higher amount of traffic, then a 120 connections GW will be required.
Call center agents are typically trafficked at 32 C.C.S. and thus require a connection on the GW
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).
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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.)