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hello
I want to use BLF for dahdi channels to monitor and use the pstn lines,
what configuration is needed for yealink T21?
Hi,

BLF can only be used to minotir extensions registered in a same pbx server. It can't monitor an external line.

Regards,
James
I think what you may want is SLA (shared line appearance) to be able to monitor a C.O. trunk right on your system..

http://www.asteriskdocs.org/en/3rd_Editi...k/SLA.html

is a good place to start..

-Christopher
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