Avaya 3641, Installation, Configuration And Administration

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AVPP Overview
Issue 6, January 2011 11
any one subnet. Up to 16 models of AVPP Servers may be installed in any one subnet. All
AVPPs must be in the same subnet.
When more than one AVPP Servers are installed, the wireless telephone load is balanced
across the available Servers, both for the communication path between the AVPP Server
and the wireless telephones, and between the AVPP Server and the PBX (or other far-end
device).
AVPP Server Availability
An Avaya handset registers to a single AVPP Server the first time it is powered on. Once
the handset has contacted this Registration Server, it obtains a list of all AVPP Servers in
the system. The handset then maintains this list in non-volatile memory and updates only
when rebooted. When a handset later attempts to check in and cannot contact the
ordained Registration Server, it will then fall back to its list of other Servers and attempt
to check in elsewhere. After the handset has successfully checked into the system once, it
never requires that the Registration Server be present unless the handset is reconfigured
back to factory defaults, or the entire system of AVPP Servers is changed out. See section
Swapping/Adding/Deleting SVP Servers
.
Registration Server Identification
The handsets identify the AVPP Server in three possible ways. These are outlined in the
next chapter of this document. Essentially, the AVPP Server can be identified by a static
IP address in the Admin menu, by a DHCP option 151 specification, or by a DNS query of
“SLNKSVP2”. The address found identifies the Registration Server.
1.5 Multiple Avaya Voice Priority Processor Capacities
The system capacity of each AVPP model is shown in the below tables. Note that AVPP
models may not be combined within one subnet.
AVPP 10 and AVPP 20 Server Capacity
The system capacity of the AVPP 10 and AVPP 20 is measured by number of powered-on
handsets. If this number exceeds the maximum, the handset that cannot be served will
display an error and will not connect to the AVPP. Other handsets will not be affected.
Number of AVPPs
Number of handsets
AVPP 10 AVPP 20
1 10 20
2 20 40
3 30 NA
4 40 NA
AVPP 100 Server Capacity
The capacity of the AVPP Server is determined by active calls. The table below shows the
capacity of an IP gateway in a multiple-AVPP Server environment. The table shows the
total possible calls at 100% active calls. However, since it is unlikely that all handsets
will be in use at the same time, the table then analyzes the number of handsets that could
be installed in any given system where 10%, 15% or 20% of the handsets are in active
calls at any one time. The calculations are not linear due to the Erlang
1
calculation for
1 An Erlang is a unit of telecommunications traffic measurement. Strictly speaking, an Erlang represents the continuous
use of one voice path. In practice, it is used to describe the total traffic volume of one hour.