Call park is a feature that enables a person to place a call on hold on one phone and then continue the conversation on another. For example, BLF can be used with call park to make quick transfers of calls easier. Other functions of BLFīLF possesses multiple other functions in addition to providing line status information and the ability for other lines to accept the call. BLF can be configured so a call that is meant for a specific extension or person who is currently unable to answer can be picked up by a different employee on a separate extension, ensuring external callers - such as customers or suppliers - rarely have to be put on hold.
The BLF will then show the employee's call status in the office, alerting colleagues as to whether or not they are using their mobile or smartphone, even if they are in a completely separate location.Īnother important use of BLF is call pickup. When this is done, the phone is linked to the BLF almost like a normal extension. Using BLF, supervisors can monitor team members' extensions and vice versa so all team members are aware of each other's current status.įurthermore, BLF can be integrated into fixed-mobile convergence environments and utilized with mobile or smartphones.
#Sip definition death free
BLF enables employees to see if their colleagues are free to take a support call or if their supervisor is on another line and unable to help another customer.Īnother example of BLF use is for teams working on a specific project. This will enable the secretary to make the decision to put the new caller on hold or let them through to the boss.Ĭall centers and customer support groups might also find BLF to be valuable.
For example, a secretary's phone can be configured to display the call status of the boss's line, allowing the secretary to know whether the boss is on a phone call or not. Uses of BLFīLF can be utilized in numerous ways by businesses using phone systems with multiple extensions. The repetition of these actions composes the notify process.įinally, a phone can unsubscribe from BLF by sending another subscribe SIP message to the IP PBX with the expires header set to 0. The phone must once again acknowledge this message and then send back a 200 OK SIP message. Whenever the status of the extension changes, a notify SIP message will be sent back to the subscriber. The notify SIP message includes extensible markup language (XML) in the message body. Once this is done, the subscription process is complete and the requested extension or set of extensions will be monitored.Ī notify SIP message is sent to the subscriber to reveal the status of the line being monitored. The server will then authenticate the phone that is making the request and send a 200 OK SIP message back to the subscriber which must be recognized by the device. Once the BLF has been configured by the user, the phone will send a subscribe session initiation protocol ( SIP) message to the IP PBX asking to be alerted to the status of a specific extension or list of extensions. In this process, the phone that is making the BLF request is known as the subscriber. How BLF worksīLF operates in a three step process: subscribe, notify and unsubscribe. For higher end phones, the BLF functionality may be a touch screen button instead of a physical button. While the color schemes differ between original equipment manufacturers ( OEMs), green, red and orange are commonly used to designate an available, busy or error status, respectively. On newer phones, the lamp is a small light-emitting diode (LED) that changes color based on the line status. BLF is a valuable asset to companies that utilize a large amount of phone line extensions under one system. The number of BLFs that can be applied to a phone vary based on the area and type of application.
#Sip definition death software
The BLF must be manually configured on a compatible device by the phone user either as an add-on feature that can be connected to the phone or as a software on a computer. A busy lamp field (BLF) is a light on a VoIP phone - also known as an IP phone - that tells end users when another extension within the system is in use by displaying a clear status on the phone's display.
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