Phone not working after installing new modem

[cadcirjack]

Installed a new modem today.  Internet and TV are working fine but phones are not.  They were working before I took the old modem off.

[bobhc]

Have you activated the new modem as described in the following message?

https://forums.xfinity.com/t5/Home-Phone-Service-Equipment/How-to-purchase-and-install-a-voice-modem...

[cadcirjack]

Thanks for trying to help.  None of the modems pictured are the one we just got. 

After an hour with Comcast  support and two days of waiting for level 2 support we came home to working phones and a voicemail saying they had to do some re-programming on their end.