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.
We want to setup RingCentral's Office VoIP service on our network. Can we do that?
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!
Hello FCIHC_DanielG and welcome,
Yes, there are many Comcast Business customers that use their dedicated VOIP Router to serve their business requirements. Configuring your Comcast Gateway DPC3941B (CGDPC) in true bridge mode will disable all your CGDPC routing functionailty including DHCP LAN, WIFI, Natting, et al. The best vehicle for this is to obtain a Comcast Static IP Address (CSIP) for your CGDPC, then program your NetGear AC1750 (NGAC) WAN interface with the CSIP. You must also make sure that all CGDPC CSIP UDP ports are opened like 5060 - 5065 and any other SIP ports embedded in your Ethernet subpackets.
Hope this helps you out.
Thanks so much for your reply, VBSSP-RICH.
I have a few follow-up questions. Sorry for the length of the post, however I think these questions really ought to be fully and clearly addressed on this forum. Perhaps a Comcast tech could address this (Comcast_John?).
First, is it true that a static IP address is required in general for "reliable" VoIP service, or does it depend on the VoIP service provider and/or the internet service provider and/or the particular reliability needs of a given customer? I have seen a number of opinions:
This is a non-trivial issue. Obtaining a static IP address from Comcast costs an additional $20/month, and in addition there is a significant increase in administrative costs to install, configure, and maintain this more complicated networking configuration.
Second, there are a number of posts on the forum from Comcast_John and others that state Comcast does not allow the use of a static IP address on a modem/gateway set to "True Bridge Mode". Therefore, your solution (as I understand it) is not possible. Is that correct, or did I misunderstand you?
What I want to know is whether a small office (one IP deskphone and headset, one computer with a softphone app, 7 smartphones with softphone apps), can I use the Comcast provided Cisco DPC3941B gateway in one or more of the following scenarios with a dynamic WAN-side IP address provided by Comcast:
If either scenario 1 and 2 will actually work, and it just comes down to whether these scenarios are "reliable", I think the best way forward is to implement one of these scenarios and test it out to see if it is "reliable enough".
This is exactly what I am having issues with. I have 5 static IP's however I have to call Comcast to get put into "true bridge mode" to get it to work with my Peplink?