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How to configure DID passthru as DTMF to Fax Server when an ATA is used

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Core Issue

Topology:

Fax server-----ATA---SCCP---CCM----MGCP---3745----PRI-------

Resolution

Instead of an analog telephone adapter (ATA), it is necessary to use a H323 Cisco IOS gateway with a Foreign Exchange Station (FXS) card in order to pass Direct Inward Dial (DID) information as a dual tone multifrequency (DTMF) across the analog port (FXS) to the fax server.

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