Is the way Broadsoft implements Busy Lamp Field (BLF) with a list URI unique only to Broadsoft? I believe I am talking about Enhance BLF. In the configuration of BLF on a Polycom phone using Broadsoft there is a Broadsoft List URI field. The same is true with Yealink, Gigaset, Cisco, and other phones. Here is a configure guide for a Polycom 4.3.2 Busy Lamp Field Configuration http://community.polycom.com/polycom/attachments/polycom/VoIP/8977/1/Partner... Here is the config guide for a Yealink with screenshots of what the Broadsoft screens look like http://www.yealink.com/Upload/UCOne/features/Quick_Setup_BLF_List_on_Yealink... On other platforms, freeswith for example, enhanced BLF is not configured with a list. Instead, each line you want to monitor, needs to be added in the config file. The phone then has to be rebooted, and the new config file has to be loaded. Here is what the freeswitch wiki shows: Enhanced BLF provides ringing indication and directed call pick-up capability. Once a productivity license has been installed, the BLF configuration can be added to the phone1.cfg(resp. in a phone-specific settings file like "${MAC}-settings.cfg). The following should be configured at the phone's file (e.g. phone1.cfg or *MAC-address*-settings.cfg): <attendant attendant.reg="1" attendant.ringType="1" attendant.behaviors.display.spontaneousCallAppearances.normal="1" attendant.behaviors.display.spontaneousCallAppearances.automata="1" attendant.behaviors.display.remoteCallerID.normal="1" attendant.behaviors.display.remoteCallerID.automata="1" attendant.resourceList.1.type="automata" and for each user you want to watch: attendant.resourceList.1.address="8000" attendant.resourceList.1.label="FirstUserName" attendant.resourceList.2.address="8002" attendant.resourceList.2.label="SecondUserName" />