Headset Prior (Yealink T21P)

[jolouis]

While I agree with you to some degree, the underlying problem is that you are making assumptions without actually reading the documentation.

The manual states:
features.headset_prior
0-Disabled, the headset mode will be deactivated after the call, if you switch the headset mode to speakerphone/handset mode.
1-Enabled, the headset mode will not be deactivated after the call, even if you switch the headset mode to speakerphone/handset mode.

So basically the option is only there to ensure that that headset mode does not get "switched off" by lifting the handset. (i.e. with this option disabled, if you were talking on a headset and then picked up the handset to talk, when you hung up again the phone would remain with headset mode OFF. With this option turned on, even if you pickup the handset to talk to someone, when you finish that call the Headset mode will re-activate, making sure the next call comes in on the headset again). It has nothing to do with what you are asking for.

There are two simple solutions to this problem:
1) Ditch the T21 and lifter, get a more advanced phone and headset that support EHS. This costs more $$ but is a much cleaner solution.This is the application/configuration modern headsets should be using.
2) Get a headset adapter/switch that will let you connect the headset inline with the handset. Connect this way and do not use the headset mode of the phone at all. This is the application/configuration lifters were designed to be used for.[/b]