A T1 line is good for extensive data transfer and video conferencing by many users at once. Situations vary a lot from one phone company to the next. The problem with ordinary voice lines are that each call is a different circuit, hence unreliable. A leased analog line could be a solution. It eliminates random circuit selection problems, and with various types of line conditioning, there are satisfactory speeds available.
Charges are monthly regardless of the amount of usage.
If the other school is a long distance call, you may be able to take advantage of remote call forwarding. You are in town A, and town C is a long distance call. However, you can call town B locally, and town B can call town C locally. D - conditioning International conditioning Tone control conditioning Special Telephoto conditioning Type 5 service is the most common, with type C and D conditioning. A T-carrier line is a full duplex digital signal over two wire pairs, multiplexed into 24 channels.