Grandstream Networks HT502 - Fax Support; Call Features; Table 7: HT502 Call features

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HT502 User Manual
Fax Support
HT502 supports FAX in two modes: 1) T.38 (Fax over IP) and 2) fax pass through. T.38 is the preferred
method because it is more reliable and works well in most network conditions. If the service provider
supports T.38, please use this method by selecting Fax mode to be T.38 (default). If the service provider
does not support T.38, pass-through mode can be used.