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Each channel (DSO) of a local T1 provides local phone service. In most cases, for local voice T1 to be cost effective in comparison to POTs (plain old telephone service) lines, a company must need at least 12 phone lines. Local T1 can be provided by a few providers in the form of fractional T1, which can provide as few as 12 channels rather than 24, for less cost than a full T1. Voice channels are also included with integrated T1. Integrated T1 provides both voice and internet channels in the same T1 circuit. With integrated T1, the 24 channels can be allocated in virtually any combinations of voice and internet lines, depending on the needs of the customer. Integrated T1 is often more efficient for smaller companies than obtaining two separate T1 circuits for each voice and internet service. Local voice T1 is sometimes confused with long distance T1. Long distance T1 bypasses the local telephone company, thus resulting in significant savings on long distance service. It is important to know that local calls cannot be made with a dedicated long distance T1. Voice T1 is often confused with data internet T1. Without the use of VOIP (voice over internet protocol), an internet T1 circuit cannot be used for making traditional voice calls. Long distance calls however can be made with local voice T1, usually for a per minute charge. For companies which need more than 24 voice lines, bonded voice T1, fractional DS3 voice, or full voice DS3 are options. Full voice DS3, can provide the equivalent number of voice channels as 28 voice T1s. Through the use of recent compression technology, some providers are beginning to compress voice channels to as little as 32 kbps per voice channel. With the use of compression, T1 lines can carry more than 24 voice lines. Compression technology at this point has not fully matured. For this reason, only a few providers offer compression and thus far reviews are mixed.
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