Use this tool to find the codes of your devices and to get specific instructions on programming the codes into your Comcast remote.
You can create a list of up to 25 numbers that will be told you are not presently accepting calls
However, the Comcast help, instructions and advertisement still has 12 (the old numbers) as the number.
Had I not read a user forum, I would have beleived the wrong instructions.
At my place of business, one of the many databases I created was for Change Management.
It saves the company a lot of money, efforts and time.
Comcast should do the same.