I have been told by Sonic support that the phone number rejection list is limited to 100 numbers.
I hit that number fairly quickly due to all of the unsolicited robo/spam calls that come in regularly.
It would be very beneficial if Sonic would increase the amount of numbers that can be stored on the rejection list.
Ideally the rejection list would allow for unlimited entries, but if that is not possible then please increase it to as many as possible. 1000 entries would be sufficient for some period of time, but 100 is not nearly enough.