Programming the multipurpose keys on a Grandstream GXP2130/40/60 phone

The attached document shows how to program the multipurpose keys on the new, Linux-based Grandstream phones to function as speed dials or busy-lamp-fields (BLF) so you can see at a glance if your co-workers are on the phone.

The same technique can be used to program older Grandstream phones as well.

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