* The _PDCH ACT_ type supports switching between _TCH/F_ and _PDCH_ and is
  compatible to the dynamic PDCH protocol employed by _ip.access nanobts_
  devices. It uses a non-standard _RSL PDCH Activate_ message.
* The _CHAN ACT_ type supports switching between _TCH/F_, _TCH/H_ and _PDCH_.
  It uses non-standard _Channel Number_ IE value and _Activation Type_ in RSL
  _Channel Activate_ messages.