Networking & Wireless forum


Can I run VoIP phone through SB6121 modem?

by nopeecme / December 22, 2012 1:34 PM PST

My cable provider has installed a separate RCA DHG536 modem for my VoIP phone service alongside my SB5120 modem, and charges me $7 a month modem rental. I am upgrading the SB5120 to a DOC 3.0 modem and wonder if I can abandon the DHG536 modem?

Answer This Ask For Clarification
Discussion is locked
You are posting a reply to: Can I run VoIP phone through SB6121 modem?
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: Can I run VoIP phone through SB6121 modem?
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.
Collapse -
Clarification Request
VoIP Modems
by sunwatcher / December 23, 2012 1:49 AM PST

The DHG536 (with VoIP) and SB51209 (without VoIP) are both cable modems...are your sure they are working alongside each other? That doesn't seem right. It would seem that your provider should have replaced the SB5120 with the DHG536.

In any case, the SB6121 is not a VoIP modem. You would need something like the SBV6220. You should first check with your ISP on which VoIP modems are compatible with your service.

Collapse -
Thanks, Sunwatcher!
by nopeecme / December 23, 2012 9:14 AM PST
In reply to: VoIP Modems

Installer used a splitter ahead of the SB5120 to do the phone set up, and the outputs from the DHG536 are phone only; basically leaving the 5120 to function as internet only.

I will look into the SBV6220 as a way to shave costs. Many thanks!

Popular Forums
Computer Help 49,613 discussions
Computer Newbies 10,349 discussions
Laptops 19,436 discussions
Security 30,426 discussions
TVs & Home Theaters 20,308 discussions
Windows 10 360 discussions
Phones 15,802 discussions
Windows 7 7,351 discussions
Networking & Wireless 14,641 discussions


$16,000 used SUVs

Whether you like your SUVs cute or capable, or some blend of the two, we've got a wide variety of choices in Roadshow's first collection of Editors' Used Picks.