Linksys RTP300 User Guide - Page 46

Configuring Voice Services Using a FAX Machine (SPA2102, SPA3102 or SPA8000) 4. 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 5. Enable T.38 fax on the SPA 2102 by configuring the following parameter on the Line tab for the FXS port to which the FAX machine is connected: FAX_Passthru_Method: ReINVITE NOTE: If a T.38 call cannot be set-up, then the call should automatically revert to G.711 fallback. 6. If you are using a Cisco media gateway use the following settings: Make sure the Cisco gateway is correctly configured for T.38 with the SPA dial peer. For example: fax protocol T38 fax rate voice fax-relay ecm disable fax nsf 000000 no vad Fax Troubleshooting If have problems sending or receiving faxes, complete the following steps: 1. Verify that your fax machine is set to a speed between 7200 and 14400. 2. Send a test fax in a controlled environment between two Linksys ATAs. 3. Determine the success rate. 4. Monitor the network and record the following statistics: • Jitter • Loss • Delay 5. If faxes fail consistently, capture a copy of the web interface settings by selecting Save As > Web page, complete from the administration web server page. You can send this configuration file to Technical Support. 6. Enable and capture the debug log. For instructions, refer to Appendix D, "Troubleshooting.". NOTE: You may also capture data using a sniffer trace. 7. Identify the type of fax machine connected to the Linksys ATA device. Linksys ATA Administration Guide 46