Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
4 People are following this question.
When creating a user Identity for sms community, does it validate the phone number?
Is there a way to send an SMS message from another user's account with their credentials?
populate "to" phoneNumber for incoming fax messages
High v. Low Volume SMS - please clarify contradictory information