T25

I recently moved from my long time home to an apartment. I was receiving xfinity phone service through a voice modem and had numerous phone jacks in the house, all of which worked through the single modem’s connection. In my new apartment, I have a number of phone jacks but can’t find a way to make them work with my new Arris T25 Modem. Only the phone attached to either of the two outlets on the modem will be connected. I tried connecting the modem to one of the jacks, then nothing worked. Any thoughts? Thanks, SR

I tried to register my T25, was told the serial # doesn't match model. Never had this happen before. Any help appreciated.

I am unable to see my newly setup T25 modem to change the network name and password on the xfinity app

I know I am supposed to find the SSID and WiFi Key on the white label on the bottom of the Arris Model T25, but it is not there. Now what?

My Arris T25 is activated and is connected to the wifi but I do not know the network name or password. Please help

Will the SB8200 AC adapter work with the T25 modem?

I connected my new modem, cable is working but I can’t connect the internet and phone

I have a T25 used for Xfinity voice/internet--i can login to it on 192.168.100.1 but the limited information there does not allow settings changes nor does it show a tab for “Connected Devices”--my prior Arris did show this information. So how do i find that info as well as a settings page that goes beyone the limited info on 192.168.100.1? I tried logging into the IP address of the T25 but nothing happens.

Does this modem support the SIP ALG setting? Need to have this disabled because it is interfering with VOIP calls.

Hello, I would like to know how to manage port forwarding on the T25 Modem. Thank you.

Surfboard t25 is only working in one Ethernet port reset it many times and still only pone port working

Is the T25 modem capable of supporting 240 Mbps upload speed. It is rated to support 8 upstream channels - but my current device shows only 4 upstream channels are enabled. With 4 upstream channels I can only theoretically get 4x30 ~120 Mbps. Does anyone know what upstream frequencies comcast use? There isn’t enough bandwidth in the RF split (5-42 MHz) to support 8 channels so the diplexor config of 5-85 MHz need to be enabled to get full 8 channels. Does comcast need 4 upstream channels with 2x2 MIMO for its 200 Mbps upload speed or does it utilize 4 channels?

After I ordered T25 cable modem and voice, I realized it has no wi-fi built in. The order number #58818. I just ordered a few minutes ago. Could you help cancel the order and issue a refund? Thank you.

Here's my humorous situation. I'm not at home right now & I didn't take screenshots of my T25. I'm trying to find out the WiFi name & password so I can activate my Xfinity TV Flex box, landline & internet. I don't want to waste your time & no clue what the serial number is & whatnot. Left brochure w/ Arris customer service phone number at home. The other thing is I keep being misinformed what the proper Arris model is by Xfinity, Best Buy & Arris. Basically, I'm not the greatest techie, I need to at least verify the T25 will enable me to use my Xfinity Flex Box for my TV, my Xfinity landline & internet connection. I've purchased (3) Arris modems so far yet I keep jumping back & forth between Xfinity & Arris on the correct model. I can find out the Arris model I recently purchased from Amazon but I'd like to return it if the T25 serves my needs. I realize it's not your fault that I got stuck w/ (3) Arris modems so far. Rather humorous trying to sell my G36 as I can't even get $20 for a

Any firmware or software updates to the T25 modem? It’s rare that any manufacture gets it right the first time around.

reference: ARRIS SURFboard T25 DOCSIS 3.1 Gigabit Cable Modem bought from Amazon Xfinity has not fixed or identified any issue on their end. I’ve spent two 3 hour sessions with their support computers, techs, and elevated support. Xfinity support confirms we have the latest firmware, and have reset the modem many times as have I. I’ve tried several phone systems that perform on other systems as they should. (panasonic and Vtech). I’m reaching out to see if this is an issue with the T25 itself, as I have really run out of things to try. Any help, direction would be greatly appreciated.

Spent many hours on line/ on phone with Optimum trying to get a T25 xFinity working. Can anyone provide me with the correct reference/ firmware etc…..to I can get the Optimum (NY) tech team updated ? From other posts it seems this should work. Modem gets “Activated” by Optimum, goes through 3 cycles of reset (updates). At that point the LED indicates it is ON LINE…..however no connection is made to my computer or router. T25 Model # 613587-003-00 ( has a HFC MAC & MTA MAC #s, no CMAC like the old modem) All help and advice, appreciated.

I have a T25 on Xfinity. I tried to logon to the modem at 192.168.100.1 and username “admin” password of “password” returns invalid credentials.I don’t remember changing it, but I probably did at some point. How do I reset the device to default username and password? I’m sure I’ll have to re-register it with Comcast/Xfinity for it to work again, but that’s no big deal. I need to get information off of it, and see if maybe there’s a firmware update available, etc.

I found that my T25 has the following firmware: Firmware Name: TS11.02.057.12_092820_711.PC20.03Firmware Build Time: Mon Sep 28 17:37:14 EDT 2020 Three years seems awfully old. I contacted Comcast, and they supposedly pushed a firmware update, but I didn’t see a change. Does anyone know what the latest firmware version is? Thanks.

I am activating a new modem. The app tells me to enter the CM MAC ID. There is a MTA MAC ID or a HFC MAC ID which are different. Which MAC ID am I to enter?

I bought a T25 modem to use only for a voice line. I have an SBG8300 Modem / Router, and need to connect the two. I can’t seem to figure out the correct sequence and configuration for the 2 devices. Any help would be greatly appreciated. Thanks in advance.

I have an Arris T25 router in place for a few years and suddenly, it seems that it is blocking traffic coming to my router on Port 21. I need to see my settings, but entering 192.168.86.1 into a browser simply tells me it’s ONLINE; it doesn’t show me my settings. Can you please tell me how to see my settings? Thank you. Len Jacobson

I need to change my WiFi password. The T25 was provided by my A/V contractor (so I wouldn’t have to rent from Xfinity). The Arris consumer care instructions says to access cable modem interface and that does not work (you get an error code, I’ve tried from a PC and an iPad). The Xfinity instructions do not work either. They say their instructions only work with Xfinity provided modems

I have a T25 modem that my A/V contractor installed (so I wouldn’t have to pay Xfinity a monthly rental). I’ve tried YouTube and the internet. shown online does not work

I see 2 different T25’s with different specifications. Are there 2 versions? On older one and an updated one?I see one with “32 downstream x 8 upstream DOCSIS 3.0 channels, 2 downstream x 2 upstream OFDM DOCSIS 3.1 channels” & 2GB max speed, and another with “32 downstream x 8 upstream DOCSIS 3.1 bonded channels and 2 downstream x 2 upstream OFDM channels” with with up to 10GB speed, without any mention of the DOCSIS 3.0 spec.What’s the difference? Hardware, firmware, or something else? Thanks!