This may be a really newbie question here, and if so, I apologize.
I have a customer with Grandstream GRP2613 phones. Their multi-purpose keys are configured as a series of BLF keys to show if other extensions are busy.
I have two extensions which are “stuck” showing busy, when in fact they are not actually on the phone or otherwise on DND. Is there a way to manually clear this condition or force the PBX to start thinking the phones are not indeed busy? I can call them just fine and it does not send me to their voicemail.
I feel that I have overlooked something quite simple here. Thanks for any help or advice, everyone!