Appendix; Troubleshooting Wireless Ip Telephone Problems; Access Point Problems; Configuration Problems - Avaya 3641 Installation, Configuration And Administration

D. Appendix
On occasion, you may run into transmission problems due to any number of factors
originating from the wireless LAN. Wireless IP Telephones can exhibit transmission
problems in several ways. They can cease functioning properly, display error messages or
display incorrect data. When using and troubleshooting Wireless IP Telephones, consider
the following problem sources to determine the best method of approaching any specific
situation.

Troubleshooting Wireless IP Telephone Problems

Wireless IP Telephones can exhibit transmission problems in several ways. They can cease
functioning properly, display error messages, or display incorrect data. When using and
troubleshooting Wireless IP Telephones, consider the following problem sources to
determine the best method of approaching any specific situation:

Access Point Problems

Most, but not all, Wireless IP Telephone audio problems have to do with access point
range, positioning and capacity. Performing a Site Survey as described in the Diagnostics
section can isolate the AP causing these types of problems. If the Wireless IP Telephone
itself is suspected, conduct a parallel Site Survey with a Wireless IP Telephone that is
known to be properly functioning.
•
In-range/Out-of-range – service will be disrupted if a user moves outside the area
covered by the wireless LAN access points. Service is restored if the user moves
back within range. If a call drops because a user moves out of range, the Wireless
IP Telephone will recover the call if the user moves back into range within a few
seconds.
•
Capacity – in areas of heavy use, the call capacity of a particular AP may be filled.
If this happens, the user will hear three chirps from the Wireless IP Telephone.
The user can wait until another user terminates a call, or move within range of
another AP and try the call again. If a user is on a call and moves into an area
where capacity is full, the system attempts to find another AP. Due to range
limitations, this may be the same as moving out of range.
•
Transmission Obstructions –prior to system installation, the best location for APs
for optimum transmission coverage was determined. However, small pockets of
obstruction may still be present, or obstructions may be introduced into the
facility after system installation. This loss of service can be restored by moving
out of the obstructed area, or by adding APs.

Configuration Problems

Certain problems are associated with improper configuration of the Avaya Communication
Manager or the Wireless IP Telephone. Configuration problems are generally corrected by
changing the configuration at the Avaya Communication Manager or on the Wireless IP
Telephone. See the sections "Avaya Call Server Configuration" and "Avaya 3641/3645
Wireless IP Telephone Configuration" for specific configuration steps. There may also be
incorrect programming of the AP. See the Configuration Note for the AP in use at the site.
If the Avaya Communication Manager registration fails, note any error messages on the
display including which line icons are active. This information will help with problem
resolution.
Troubleshooting Wireless IP Telephone Problems
Issue 1, January 2007 95