Local T-1 (A local T-1 line is dedicated for local calling and switched long distance)
Definition of T-1 = A North American and Japanese standard for communicating at 1.54 million bits per second. A T-1 line has the capacity of 24 data or voice channels (24 simultaneous conversations)
Direct Inward Dial Phone Numbers
(Feature) One feature of local T-1 service is whereby each person in an organization has his or her own ten-digit telephone number known as direct inward dial (DID). Calls to DID telephone numbers do not have to be answered by on-site operators. They go directly to the person assigned to the ten-digit DID telephone number
(Benefit) The benefit to DID numbers is to give the customer the ability to save money on phone lines. A local T1 has digital trunks which allow a DID number to ride on the 1st available pathway. Thus, unlike analog lines you don't have to have a 1 to 1 ratio of numbers to lines.
(Point) Although you can have as many DID numbers as you want on a T-1 the most common ratio is about 4/1 (100 numbers per 24 channels per Local T-1).
Lower rates with exact billing in local calling area:
(Benefit) A local T-1 has lower rates on local calls or free local calling, this compared to analog line. A local T-1 providers bills in 18/6 or 6/6 second increments for zone calls and long distance calls. This also compared to analog line that use 1-minute increments for zone calls and 30/6 for long distance calls.
Note: Some states always have free local calling for all types of service.
Lower long distance rates:
(Benefit) Long distance over a local T-1 is considered switched but the majority of Local T-1 providers will give the customer dedicated long distance rates (lowest available)
ISDN PRI: (Feature) A local T-1 line with Primary rate interface (PRI) is a form of ISDN (Integrated service digital network) with 23 paths for voice, video and data (not Internet) and one channel for signals. Each of the 24 channels transmits at 64 kilobits per second.
(Benefit) The most common benefit of a PRI is Caller ID, although it is possible to use caller ID with a Traditional T-1 it is vary uncommon and the customer is limited to the information they receive.
Voice DS3
28 local, Long Distance, or ISDN PRI T1’s
Save money on the monthly cost per T1 by buying a DS3 fiber loop. The breakeven point between buying per T1 vs. a DS3 is 10 T1’s. After the 10th T1 it becomes cheaper to buy a full DS3.