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Getting Started with Voice Services
Preferred Codec: G.711u (USA) or G.711a (rest of the world) Use pref. codec only : yes Silence Supp Enable: no Echo Canc Enable: no FAX Passthru Method: ReINVITE
STEP 5 In the Audio Configuration section, enter the following settings to support T.38 fax:
STEP 6 Click Submit to save your settings or click Cancel to abandon the unsaved
STEP 7 If you are using a Cisco media gateway for PSTN termination, disable T.38 (fax
relay) and enable fax using modem passthrough. For example: modem passthrough nse payload-type 110 codec g711ulaw fax rate disable fax protocol pass-through g711ulaw Note: If a T.38 call cannot be set-up, then the call automatically reverts to G.711 fallback.
STEP 8 If you are using a Cisco media gateway, make sure the Cisco gateway is correctly
configured for T.38 with the dial peer. For example: fax protocol T38 fax rate voice fax-relay ecm disable fax nsf 000000 no vad
Fax Troubleshooting If you have problems sending or receiving faxes, complete the following steps:
STEP 1 Verify that your fax machine is set to a speed between 7200 and 14400. STEP 2 Send a test fax in a controlled environment between two ATAs. STEP 3 Determine the success rate.
Cisco SPA100 Series Phone Adapters Administration Guide