A telephone extension is a device (like a telephone or softphone) that registers to the Press8 PBX using a 7-digit "extension" number and a password.
Additionally, each configured telephone extension can be used for calling other local extensions internally by just dialing the last 3 digits of the 7 digit extension number, without the need for dialing "outside" using a public telephone number.
Your telephone extensions can be managed in your Press 8 Telecom Control Panel, by navigating to: Features=>Telephone Lines.
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