Using a Trunk for OUTBOUND calls only

[Yealink Support]

Hi TotallyVoip,

Our DECT phone has this feature and can assign the handset just can do outgoing calls.

"Preferably without maintaining permanent registration to the server, so it only connects when a call is dialed."
Just to use the ECO+ mode can perfectly meet your need.

if you want to add this feature to T28, you should contact with your distributor. They will help to push your request.