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What does Asterisk support in terms of BLF and SLA?

April 26, 2017Asterisk blf SLA support terms

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What does Asterisk support in terms of BLF and SLA?

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Busy Lamp Field vs Shared Line Appearance It is easy to think that one status lamp is much the same as another on a telephone system. However, the distinctions between Busy Lamp Field and Shared Line Appearance lamps for Asterisk is of great importance. A Busy Lamp Field is normally used to show the status of extensions whereas SLA is essentially showing the status of trunk lines. Asterisk support for BLF Asterisk uses “hints” to support basic BLF functionality. These are lines within the dial plan in extensions.conf that map a nominal “name tag” with a specific device whose state is known to Asterisk. If the device you want to monitor is an extension phone, then the name tag is likely to be the extension number. It is recommended that you use the subscribecontext parameter in sip.conf to avoid any possible confusion about the location of hints in extensions.conf.