Articulation from Hampton Software is a VoIP client compatible with any SIP provider that’s available for Palm PDAs. It is compatible with any Palm 5.x handset with a microphone and speaker:

“Articulation is an easy to use application that turns your Palm PDA into a VoIP Phone, enabling you to make and receive telephone calls using the internet. Articulation is the first service independent VoIP phone for PalmOS.”

Features include:

* SIP VoIP protocol
* Silence supression and GSM codec for low bandwidth links
* Echo cancellation for hands free operation
* Turns your PDA into a WiFi Phone (or Bluetooth/EV-DO/GPRS Phone)
* Lookup and dial from you contact list

Product site. Via EngadgetMobile.