Data is transmitted directly without conversion to an audio stream in
T.38, which uses less bandwidth. T.38 also helps mitigate the effects of
packet loss, which can be deadly for faxing, by using controls and data
Some of the disadvantages when using T.38 are that gateway support for both V.34 transmission speeds and ECM (Error Correction Mode) is not universal and additionally in a mixed environment of packet switched and PSTN, T.38 increases its transcoding overhead which can add latency.
All in all, with a clean network, low latency, no packet loss, and low jitter, enabling T.38 can make for a better much fax environment which should lead to good success.
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