Overview of G711 Transparent Fax and T38 fallback G711

In a FAX over IP communication, when a SIP External Gatway is involved, the transmission is done through T38 Procedure. From OXE R11, the G711 procedure for fax communication is implemented, as well as a “Fallback” procedure from T38 to G711.

With this feature, OXE will support two more procedures. For SIP calls, FAS support will be done in 3 modes:

• The T38 only procedure

• The G711 transparent procedure

• The T38 to G711 Fallback procedure (In a first step, fax will try to establish with T38, if remote side doesn’t support it, it will fallback to G711 mode) The configuration of the above options is made in the corresponding External Gateway parameter (Fax procedure type).

Remark: this feature is applicable for the INTIP3/MG3 couplers only