The ATA 186 supports only fax passthrough and not fax relay. On Cisco gateways fax-relay is on by default. For the fax calls to work between the ATA and the gateway, the fax-relay on the gateway must be disabled. Whereas, the DT24+ supports fax relay and not the passthrough. Hence, the problem in this scenario.
More details on this can be found in:
Configuring and Troubleshooting the Cisco ATA 186 with Fax
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