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Does the phrase 64 simultaneous calls on a T mean 64 extensions?

Does the phrase "64 simultaneous calls on a T" mean 64 extensions? How about the trunk lines? If there are 24 channels, can I use 24 ntrunk lines from the carrier?

Does the phrase "64 simultaneous calls on a T" mean 64 extensions? How about the trunk lines? If there are 24 channels, can I use 24 ntrunk lines from the carrier?
By "64 simultaneous calls", it means the number of calls that can be sent down the available 1.544 Mbps bandwidth of a T1.

Trunk lines are converted to bandwidth. It is not possible to use 24 ntrunk lines from the carriers. Simultaneous calls are dependent on the codec used. A T1 could theoretically carry 80 calls and an E1 could carry 107 calls at g729a and can therefore accommodate 64 calls. So, an IP PBX with 160 extensions may have a contention rate of 8:1 (extensions to trunks). This would normally require 20 channels of an E1 or T1. In bandwidth terms, this equates to 380 kilobits.

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