Extension is a user account in the PBX. Each user receives an internal extension number under which the user can be reached within the company. This extension can be connected to an external number, so that the extension can also be reached from the outside (DID / DDI). User extensions must be configured for use with at least one phone. These phones can be desk phones, softphones, web clients or smartphone clients. Door intercoms and other systems are also connected to an extension. In addition, there are also system extensions for IVR menus, call queues, ring groups and more.

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