The present call/ring group limitation restricts the Asterisk to 32 customers on one server. This is because the *8 function works across context settings. Changing it to 64 would not help a lot. I would like to have more than 1000 extensions one one server distributed on up to 100 customers. Further, when I move a customer from one server to another, I would like to keep the call/ring groups. So please increase the number range, allow alphanumeric strings and/or make it context sensitive!