Enable one-touch call recording via DTMF during active calls -- configure automixmon in features.conf and enable it in Dial() options.
Pick up ringing calls by group using *8 or by targeting a specific extension with **XXXX. Configures named_call_group and named_pickup_group on PJSIP ...
Define custom DTMF-triggered features during active calls using features.conf -- configure blind/attended transfers, call parking, and create your own...