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• The SBC 1000/2000 supports fax transmission using fax passthrough (G.711 codec) or using the T.38 protocol. When fax passthrough is the selected method, transmission speed is dependent upon the quality of the IP network. When the T.38 protocol is selected, the maximum speed is limited to 14.4 Kbps in this implementation.
• If T.38 protocol is used in conjunction with V.34, the Super G3 to G3 Fax Fallback feature should be enabled. This allows V.34 fax over T.38 at a rate of 14.4 Kbps.
• The 

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  supports fax on all TDM interfaces (PRI, BRI, FXS, and FXO). TDM calls, which have both call legs as TDM, use T.30 protocol. If either one or both of the call legs are IP (SIP), then the calls use T.30 protocol or inband audio. The 

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  supports both the G3 and Super G3 fax protocols.