When is it economical to switch from a group of basic analog lines to a T1 service?
When the aggregate cost of all the analog lines exceeds the collected cost of a T1. Since the prices of analog lines and T1s vary from region to region, one can not know precisely when it is more economical to switch from analog lines to a T1. However, if you have more than 12 analog lines, then you should begin pricing out possible T1 plans. NOTE: a “Basic” T1 can probably be attached to your current telephone system without modification. However, a “PRI” T1 will require a special component addition to your telephone system.