Visitor
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10 Messages
Replacing the Xfinity modem with your own modem
I got tired of my Xfinity bill getting so expensive and called Xfinity Customer support to talk about it, and they suggested I can significantly reduce cost by eliminating all the equipment I was renting from Comcast. All I had to do was return the equipment and purchase my own modem and just use the "Xfinity Stream" App. I followed their suggestion and purchased the Motorola MT8733 that was recommended as one of the devices for the Xfinity Internet Plan. I picked this device because it supports WiFi, a "Voice Telephone", and DOCSIS 3.1 - which seemed to be functionally equivalent to the XB7 I was renting. After a couple of fixes, I can say the "Xfinity Stream" functionality meets my expectation.
However, I was having trouble getting my "Voice Telephone" (aka Land Line) working with the new modem. Specifically, I could receive incoming calls with no issue, but I could not make an outgoing call as it just results in a busy signal. I spent a couple of weeks working with both Motorola support and Xfinity support trying to resolve this issue. The most frustrating part of that exercise is the finger pointing, where Motorola says the problem is with Xfinity and Xfinity says the problem is with Motorola. I have to say Xfinity seems to be winning the argument because they swapped the MT8733 with their XB8 and demonstrated my Land Line phone works in both directions - but when I shared that information with Motorola they were not surprised (I am not sure what they mean by that).
Motorola tells me there are other customers that have accomplished what I am trying to do, and have suggested reaching out in this forum for advice. Is there anyone on this forum that has had success in replacing the Xfinity modem with their own modem to support Xfinity Stream and a Voice Telephone? If so, please share what modem you are using and please share any special steps needed to get your Land Line working as expected.
Accepted Solution
user_e0a095
Visitor
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10 Messages
1 year ago
I wanted to share my status on this topic. I installed the following equipment yesterday:
I then contacted Xfinity support and getting the above equipment activated for internet and "Xfinity Stream" was fast and easy. However, there was still an issue with my Land Line but that was eventually corrected 24 hours later (the issue being something about provisioning and "back end signals").
Everything has been running well now for several hours, and I plan to return the rented XB8 later this week.
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XfinityLinda
Official Employee
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1.3K Messages
1 year ago
Thank you, @user_e0a095, for meeting us here in our forums about your experience with the Motorola MT8733 and our Xfinity Voice service. We hope our community brings more clarity for you. I also want to let you know the Netgear CM2050V is also compatible with our Xfinity Voice service. In case you decide to swap the Motorola modem. Please let us know if you need anything else from us.
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EG
Expert
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107K Messages
1 year ago
Here is an excellent site for information about all things that are router !! Poke around the various sections, you can learn quite a bit !!
https://www.smallnetbuilder.com/tools/charts/router/view
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user_e0a095
Visitor
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10 Messages
1 year ago
XfinityLinda,
While I am waiting for others to share their experience, I want to explore a different idea.
I am happy with the XB8 device as it meets all my home requirements, but I am not happy about renting it forever.
Is there any option to purchasing the XB8 device?
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EG
Expert
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107K Messages
1 year ago
@user_e0a095
They don't sell modems / gateway devices.
(edited)
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XfinityAldrik
Official Employee
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1.7K Messages
1 year ago
Thanks again for reaching out to us @user_e0a095! Based on the issues not occurring on other modem/gateway devices, we were able to isolate the cause of the landline issues to be linked to the specific MT8733 being used. There are not any tickets open or mention of this issue being a “known issues” for this model. It is possible that specific device was defective since the manufacturer was unable to resolve the issue either.
Using our awesome site for compatible devices, we were able to confirm the Netgear CM2050V is a compatible modem for your current internet speed tier and home phone services. This device does not have wireless internet/router capabilities so a router will be needed.
We determined it was best to see what routers are compatible with the modem by checking the modem’s manufacturer’s website.
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user_3wszfi
2 Messages
1 year ago
Good Morning - I'm currently using the CM2050V for both data and voice with no issues. It's connected to an ASUS RT-AX86U which is in AiMesh mode with a RT-AX68U to increase wifi coverage to a remote part of the house. No issues with this setup on a 1Gb down plan. Xfinity pushed a new firmware version 9.01.01 sometime in the past few months which supposedly will allow it to provide higher upload speeds when my area is upgraded (so far no issues with that firmware that others on the forums have reported).
I've used several other voice enabled modems and modem/router combos over the years with no issues - C7100V & T25 but those are no longer supported on my speed tier.
Although this is a longshot since the Xfinity modem works and I'm certainly not an electronics engineer....have you checked that your original POTS copper connection (Verizon in my area) is disconnected from the rest of the house phone wiring if you're connecting to that. Guessing that any voltage coming in on that line could trip up the modem connection but would have expected it to affect both Xfinity and consumer gear.
Good Luck.
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user_k1bkq9
1 Message
10 months ago
I have enjoyed reading this very helpful thread. I am considering investing in a voice modem and router in place of my rented unit from Xfinity as well. My question is whether this change is really worth the effort and cost. It appears that the buy in price for modem and router is around $600. Given that comcast charges $15/month for theirs, there is no ROI for over 3 years. And by then, the equipment may need to be replaced. So, I ask, why would anyone do this?
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user_sfol53
1 Message
6 months ago
I also don’t want to pay a monthly fee for a modem/router so I decided to use my own. The Motorola MT7711. I chose this one as it is on the Xfinity list of approved modems, it accommodates land lines. And it was highly rated in an article I Googled. About seven days into this everything seems to be working. I realize it’s docsis 3.0 and it’s not as effortless as the Xfinity equipment but it’s working quite well. My download speed is about 350 on a good day which is less than I’m paying for. I can make and receive phone calls. I looked at the big online retailer and this modem is about $155 for a new one and far less if you scroll down a little for “like new”
condition. Good luck. Xfinity is great. But they’d be awesome if they let you buy the xb8.
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