Call waiting is a service whereby a user already on a call, is notified by a tone that second call is incoming.
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This service is enabled by default for all essensys clients.
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However it can be disabled (for users wanting the second call to go to voicemail or forward elsewhere), by dialling *43 on your handset, and enabled by dialling #43.
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More phone tips and tricks are found on the Polycom user guide.