Is the Cisco DPC3941B gateway configurable for use with a 3rd party VoIP?

I am a new member here in this forum. I have looked at quite a few posts to try and answer my question, but the picture is still pretty fuzzy to me. I hope you can help.

QUESTION:

We want to setup RingCentral's Office VoIP service on our network. Can we do that?

CONFIGURATION:

• We have Comcast Business package installed and configured by Comcast techs as follows:
  Internet Deluxe 25 (25 Mbps/10 Mbps) with the Cisco DPC3941B gateway
  Business Phone (2 lines) with the Arris TM502G/CT Telephony Modem
  TV Select PRIVATE (never used it, never connected the TV box)

Can I configure the DPC3941B to accomodate RingCentral's VoIP port needs?

Do I need to put the gateway into "Bridge Mode" (or "True Bridge Mode") and add a RingCentral approved router such as a NetGear AC1750?

Any other problems I hould be aware of?

Thanks for your help!

=Daniel