PSTN Control Settings
To dial one PSTN phone call under VOIP mode, you can dial the prefix digits first then phone number. If your device is on the PSTN mode, you don't need to dial the prefix digits for PSTN phone calls.
Prefix digits to dial PSTN phone call:
(maximum: 4 digits)
To dial one PSTN phone call, you also can configure PSTN phone numbers below in advance. The valid characters can be any digits (from 0 to 9) and special characters (e.g., *, #, X) where X represents any digits.
PSTN Phone Number
PSTN Phone Number
PSTN Phone Number
PSTN Phone Number