Any Thirdlane/Asterisk gurus out there willing to help with this I'll be glad to compensate.
Our standard setup is a Yealink phone with a "Call Park" button, then four BLF keys for lot 701,702,703,704. This works great 99% of the time, but there is the occasional instance where instead of hitting "Park", they hit one of the Lot BLF keys and if it already has a call in that lot, it will bridge these two calls together, and now you have two customers talking to eachother by themselves (which can be disastrous for most businesses). Is there anyway to block this from happening while still having the lot calls be retrievable by pushing the BLF? (In essence, block external channels/calls from connecting with another in one lot)