Replacing the Xfinity modem with your own modem

Thanks "XfinityLinda" for the info but I need another hint. I see the CM2050V listed on your site of recommended devices, but the CM2050V does not support WiFi. I also suspect the CM2050V does not support the Router service. I assume that means I would need another component to perform Router and WiFi services. Please share your recommendation for a full solution - it doesn't matter to me if the Modem/Router/WiFi services are integrated in the same device, or implemented with separate devices - I just want a solution that is functionally equivalent to the devices you rent (eg the XB8) .

@user_e0a095 You are correct, Wi-Fi is not supported by the Netgear CM2050V. The only choice is the Motorola MT8733 as an all-inclusive option.  While troubleshooting with Motorola was the option to swap out for a new device of the same model offered? Not sure if you possibly purchased a defective one. I apologize but our compatible device link: https://www.xfinity.com/support/devices/#unauth is not showing a recommended router only option. My recommendation is to keep renting our awesome XB8.

Thanks "XfinityLinda", but my purpose for using the forum is to ask if anyone has had success in replacing the Xfinity modem with their own equipment (using either an "all-inclusive" device or multiple devices) to support Xfinity Stream and a Voice Telephone, and support router and wifi services.

Regarding your question - I want to avoid the experience I had with the Motorola MT8733 where Motorola blames Xfinity, and Xfinity blames Motorola.  Motorola support tells me they have seen the same issue with other customers and the issue was owned and corrected by Xfinity.  This makes me think Xfinity needs to educate their field technicians.  However, if someone reading this tells me they are using the MT8733, then that adds credence I had bad luck in purchasing a defective one.

@XfinityLinda​ I own the Motorola MT 7711 and I was told by Xfinity this is a good choice for replacing the xb8, which I plan to connect shortly as my bill is going up and this Motorola is just sitting in my storage case. I have your home telephone service and the MT 7711 should accommodate this. Am I correct?

@user_rpx643 

Yes. It supports their voice service. Which speed tier / plan are you subscribed to ?

Xfinity Gateways are available to rent, and not available to purchase, @user_e0a095. Have you tried plugging your phone into the various available ports on your device to see if it helps make outbound calls?  

Not me personally, but the two Xfinity Technicians have tried several phones in both ports with the same bad results. The Xfinity Technicians blame Motorola, and Motorola blames Xfinity.  Here is the response from Motorola:

• "The facility that allows landline connection in our MT8733 is passive. ... The ability to receive calls but not place calls is all on Xfinity's side. ... We've dealt with this behavior in these devices before.  …  I still stand that it's an Xfinity issue because we have seen this with other customers before."

To be fair, Xfinity did demonstrate the phone works as expected with their XB8 device, which boosts their claim it is Motorola's issue. I never expected this to be this hard, which is why I posted on this forum to ask how others solved this issue.

Let's troubleshoot this issue, and we'll get to the bottom of this together, @user_e0a095. Please send a direct chat message with your full name and complete service address to “Xfinity Support”? To do so, click on the chat icon located at the top right of this forum's page.
 
Here are the detailed steps to direct message us:
• Click "Sign In" if necessary
• Click the "Direct Message” icon (upper right corner of this page)
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
• Type your message in the text area near the bottom of the window
• Press Enter to send your message

EG, I am not surprise to hear that - I suspect it is because they make more money renting the equipment. 

Hopefully, someone in this forum has found a solution and is willing to share that solution with the rest of us.

I agree, the chat was productive. I was a little disappointed to learn Xfinity does not recommend any Routers with that modem.  Looking at the Netgear site, I am leaning toward this equipment:

• Netgear Nighthawk Xfinity Modem with Voice (CM2050V) Cable Modem DOCSIS 3.1 
• Netgear Nighthawk WiFi 6 Router (RAX120) 

I am a little uncomfortable making a guess, so I am still interested to learn from other forum readers what success that have with their own solution.  

If I don't hear anything by Tuesday next week (Nov 28), I will proceed with this guess, and will report any status next week.

User_3wszfi, Thanks for posting your information about the CM2050V - That gives me confidence that is the right direction to go. 

I see your RT-AX86U Router is recommended in EG's "smallnetbuilder" link above, but I am going to be paranoid and use the same vendor for both modem and router.

Regarding your "longshot", I will let the Xfinity folks following this thread post their own theories and comments. For me, I felt Xfinity had a (slightly) better argument, so I returned the Motorola device. Hopefully, I won't see the same issue with the Netgear device.