Avaya 555-245-600 Manual Do Utilizador

The most commonly used default value for a general business system is 0.11 Erlangs per 
station. The most common way to determine trunk usage rates is to divide the total traffic load 
that is carried by each trunk group by the number of trunks in the group. It is difficult to assign a 
typical default value for usage per trunk. Such usage can vary greatly from system to system, 
and even from trunk group to trunk group within a particular system.
Traffic usage has two components:

●

Average call duration (also known as call hold time)

●

Average number of calls per hour 

Systems are usually engineered to accommodate the busiest hour of a normal business day. 
The number of calls that are completed during that busiest hour is denoted by Busy Hour Calls 
Completed (BHCC). BHCC is not be confused with Busy Hour Calls Attempted (BHCA), which 
represents the total number of calls attempted during the busiest hour, regardless of how many 
of those calls are actually successfully completed. The general expression for the relationship 
between BHCC, average call duration, and usage is:

A commonly used default value for average call duration in a general business system is 200 
seconds per call. 

 shows how to calculate the station usages using the 

data given.

Assume that an enterprise has sites in Atlanta, Boston, and Cleveland that it wants to populate 
with the following endpoints (

Usage (Erlangs)

BHCC seconds per call

×

3600

-------------------------------------------------------------

=

DCP 

Telephones

540

180

IP Telephones

1,080

450

270

Analog 

stations

108

18

Road Warriors

27

Other

Two G350 Media Gateways, each of which 

supports 18 analog stations, and a suitable 

number of circuit-switched PSTN trunks