VoIP phones provide an intercom feature that allows you to instantly connect to other phones within your office. Intercom functionality is ideal for announcing visitors or asking a quick question.
When one phone intercoms another extension, it does not ring the other phone. Instead, the other phone will beep, and then its microphone and speaker turn on.
To intercom
Dial 08ext. For example, to intercom extension 100, dial 08100.