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T38 Fax Relay and Cisco Text Relay Configuration for SCCP

As mentioned throughout this chapter, SCCP fax, modem, and text features are configured globally under voice service voip. Example 10-4 shows an SCCP configuration for T.38 fax relay and Cisco text relay.

In Example 10-4, the SCCP voice signaling protocol uses NSE-based T.38 fax relay, as shown by the keyword nse in the fax protocol t38 command. The force keyword within this same command line ensures that NSEs are always used even if NSE support has not been verified on the remote device during the call setup.

Example 10-4 T.38 Fax Relay and Cisco Text Relay Configuration for SCCP

voice service voip text relay protocol cisco fax protocol t38 nse force ls-redundancy 0 hs-redundancy 0 fallback cisco

! Fax modem and text configuration for SCCP takes place globally under voice service ! voip.

The fax protocol t38 command here in Example 10-4 is configured the same as in Example 10-3 with regard to the redundancy and fallback settings. Both the low- and high-speed redundancy parameters are set to zero, which disables T.38 redundancy altogether. The fallback option in this command is set to cisco, which means that a Cisco fax relay switchover will be attempted if the switchover to T.38 fax relay fails.

The command text relay protocol cisco under voice service voip enables Cisco text relay for all SCCP ports. The optional text relay commands of text relay rtp and text relay modulation are also available here under voice service voip if needed.

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