Do Not Disturb for phone

So I made the switch from Verion FIOS to Comcast.   Took the land line with me and thought Comcast would provide basic phone management options.  Nomorerobo is better than nothing but a "do not disturb" option is needed.  Verizon lets you switch "do not disturb" on and off (online) and allows up to six numbers (you enter) to pass through the do not disturb block.  Worked great, added family member phone numbers to pass through.  A nice backup in case cell service is not available.  Best of all, it blocked all of the spammers who are not in the Nomorerobo database.  Since they now have access to the line, I may have to shut off the land line.  Please Comcast, add a do not disturb feature.  If I missed a comcast option that will work for me, please let me know.