Matrix SPARSH VP710 User Manual page 415

You can hold, transfer or set up a conference call while recording.
When you end a call while recording, the recording will be stopped and saved automatically.
To stop recording while the phone records, do one of the following:
• Swipe the soft key area left and then tap the Stop soft key during a call.
The status bar prompts "Call has been successfully recorded on device".
Matrix SPARSH VP710 User Guide 407