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Chapter 20 Moving and replacing telephones 231
Installation and Maintenance Guide
Replacing telephones with different models
If you disconnect a digital or analog telephone and connect a new telephone of a different type into
the same jack, for example, replacing an T7310 telephone with a T7316E, the new telephone keeps
the old extension number but does not retain the user parameters. The new telephone receives a
default profile for a telephone of its type. Refer to the Business Communications Manager
Programming Operations Guide for telephone configuration information.
If the new telephone has fewer lines than the old one, automatic outgoing line selection cannot
work with the Handsfree/Mute feature. You must select a line manually.
Status of the replaced telephone
The replaced telephone loses its programming and internal number. If the telephone is plugged in
again at another jack, the Business Communications Manager considers the replaced telephone a
new telephone.
Note: If you replace a digital telephone with an IP telephone, or vice versa, programming
is lost because the connection method is different. You can assign the same DN, but this
causes programming issues by making the DN numbers incongruous for the DN range
supported by the module to which the digital telephone was wired. This is only an issue if
you rewire that module port to another location and install a digital telephone at the new
location. There is a potential DN conflict between the IP telephone and the new digital
telephone in these circumstances.
Refer to the IP Telephony Configuration Guide for directions about installing an IP
telephone.