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Enabling Busy Lamp Field

Busy lamp field (BLF) is a feature for many SIP desk phones that shows the line condition for other users on the same PBX (domain). The users are displayed as buttons on the device, depending on the number of feature buttons available on the particular model of phone (see chart below).

 

Enable BLF

To use BLF, you must enable it for your PBX (organization) on the "account" tab of the admin portal. If your account has more than one PBX (organization), please ensure the correct one is selected in the "Active PBX" drop down.

Note: BLF is included for OnSIP customers on the Per Seat Metered Plan, though your OnSIP admin must still enable BLF for your PBX (organization) to use it. For customers on the Pay As You Go Plan, please refer to our pricing page on www.onsip.com.

Busy lamp field

 

Configure BLF

You will configure BLF individually for each phone via the OnSIP provisioning server. An instruction guide can be found in the knowledgebase article for setting up phones.

Phones supported at the moment:

  • Polycom Soundpoint IP 450/550/560/650/670
  • Polycom VVX 300/VVX310/VVX400/VVX410/500/600
  • Panasonic KX-UT 133/136B/248B/670/UTG200B/UTG300B
  • Cisco/Linksys SPA941/942/962/501G/504G/508G/509G/525G/525G2
  • Yealink T20P/T21P/T22P, T23P/T26/T28/T32/T38/T41P/T42G/T48G
  • Grandstream GXP2124/2100/2110/2120/2130/2140/2160/ GXV3240/GXV3275/UTG200B/UTG300B

 

Updated August 2015

 

Technical Notes Updated October 2017 :  
* "Ringing" state has a five minutes timeout.
* "Committed" (On a call) has a one hour timeout.
* "Terminated" status has a 12 hour timeout.  Timeouts do not publish a status alert.

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