BLF Extension Monitoring for Medical Offices

BLF or Busy Lamp Field use in Medical Offices

Oftentimes, I get asked what BLF is and what purpose it has for Small Offices and Medical Offices. BLF stand for Busy Lamp Field and it is used mainly to monitor the line status on a specific extension. This is especially useful for a receptionist in a busy Medical Office that handles a large volume of incoming calls and must route it properly to the correct destination as effieciently as possible.

Using BLF will allow the receptionist to know if a specific phone or extension is in use. Knowing this small bit of information will enable the receptionist to know whether to transfer a call to a Doctor’s office or directly to his/her voicemail.

BLF information is readily available by a quick glance at the IP Phone’s status indicator lights. The status indicator will be solid Green for an extension that is free but it will be solid Red for an extension that is in use.

While it is a simple process of enabling BLF, not all Hosted VoIp providers utilize this feature. Yes it uses up a small amount of bandwidth for the status notiications but I believe it is well worth it. Therefore, BLF is available on all ExpressVoice PBX Business Pro and Elite Plans allowing any Medical Office to take advantage of this powerful feature.



About Express Interconnect: We are a Portland, Oregon based Small Business VoIP Phone Consultant specializing in implementing quality VoIP PBX system based on Asterisk IP PBX. We can be reached at 503-820-3513 or via email at: and can help with any questions you might have.

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