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    Can I use more than one telephone with the same extension number?

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    No more than a single telephone should be used with a telephone extension, and will produce undesired results. Telephone registration, call delivery, etc, is done using a signalling protocol called SIP (Session Initiation Protocol), and was not designed for using more than a single end point per extension.

    It would be possible, however, to setup the same SIP credentials on more than one telephone, so long as only one of the telephones is live at any given time (by unplugging or disconnecting the Ethernet cable on the unused telephone).

    In any case, it is highly recommended to always use a unique extension for each telephone.

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