voice modem not powering home phone wall jacks

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@stephenie89 wrote: ... When I plug a phone directly into the modem, that phone works. When I plug the modem directly into the wall jack to give all the phone jacks in the house dial tone- nothing. ...

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Do you have a phone cord connecting the CM1150V to a wall jack to energize the other jacks? If that doesn't work, as stated, you have a wiring problem somewhere.

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@stephenie89 wrote: Yes, yes,and yes. ...

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It isn't realistic to expect Forum members to troubleshoot a wiring issue in your home. Comcast can't do it remotely either. You need someone on site with appropriate test equipment. Sorry to disappoint!

Do you happen to have a 3rd party alarm system connected to your phone wiring?

I had this set-up and problem.  Use one xfinity voice line.  Out of the back of the modem, I had one phone line splitter.  One side of the splitter went directly to an office phone, the other side of the splitter went into a wall phone jack to energize other jacks around the house.  Everything worked fine, until one day it didn't.

Troubleshooting Steps:

• rebooted router with splitter in place
• changed splitter with two phone cables
• plugged phone cable that energized phone jacks directly into modem, would get a breif dial tone, then fast busy, then nothing
• plugged phone cable from office phone directly into modem worked

Turns out that I had a short in my home wiring.  Some of the phone wires in the interface box weren't properly terminated, and must have moved enough (from wind, leaf blower nearby, who knows?) that they were creating a short.

Comcast tech terminated the wires in the box, now everything works properly.  Although still have an ever present hum in the line on both phones. 

So, nothing had changed that I could figure out.  One day it worked, and then another day it didn't. 

One thing I did that seemed to help is that the Phone Cable I was using had only two conductors in it.  I switched to a four conductor cable and things seemed to have improved.  Also, the wall jack in the room had two plugs....I think one was wired for "Line 1" and the other for "Line 2".  This was causing problems for my alarm system not able to call out properly.  When I switched ports, things seeme to work fine now.

I just wanted to chime in.... I upgraded to a Netgear CM1150v modem with voice and use Xfinity. My phone network (and ethernet network) go through an On-Q network box that has its own power source. I could not receive incoming phone calls when I installed the new modem. I had a dial tone and could make outgoing calls but callers would receive the message "The mailbox ..is not in service". So it would not distribute the ring or the signal through the network. I was able to plug a phone directly into the modem and receive calls. Comcast tried to help but nothing changed. After scouring the boards and messing with a lot on the On-Q box, the solution came down to using Tel2 (and not Tel1) out of the modem. Who knows why.... just thought I would put it out there for anyone else with the same problem.