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Specifies whether or not the T.38 will fall back to Fax Passthrough if not supported by peer.

If fallback is disabled, and Sonus SBC 1000/2000 the

If fallback is enabled, under the same circumstances as above, then when T.38 switch-over fails, the Sonus SBC 1000/2000 will attempt to switch-over to G.711 codec (if the peer supports it).

Specifies the maximum FAX connection bit rate (bits/second).

This is the maximum rate at which a fax call will be negotiated between the Sonus SBC 1000/2000 and the fax machine. It takes longer to transfer a page at lower rate, however, lower rate may make the fax call more reliable.

Specifies the number of redundant packets sent for each T.30 (signaling) message.

In a T.38 fax call, there are two types of packets exchanged between the two gateways: signaling packets carrying fax call control information and payload packets carrying page data. The Signaling Packet Redundancy parameter controls the number of redundant packets sent by Sonus SBC 1000/2000 for each T.38 signaling packet. Use a low value for this parameter if the data network is of good quality with no or little packet loss.

Specifies the error correction mode (ECM) for fax calls.

ECM is used to make the fax call reliable (using retransmissions between fax machines). When disabled in the Sonus SBC 1000/2000 configuration, ECM will not be used, even if both fax machines support it.