Cisco SPA1001 Administration Guide - Page 68
Network Jitter Buffer: very high
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Using a FAX Machine with the SPA2102 or SPA8000 Chapter 3 Configuring Linksys ATAs Step 1 Step 2 Step 3 Step 4 Step 5 Upgrade the ATA firmware to the latest version Ensure that you have enough bandwidth for uplink and downlink. • For G.711 fallback, it is recommend to have ~100Kbps. • For T.38, allocate at least 50 kbps. To optimize G.711 fallback fax completion rates, use the following settings on the Line tab of the Linksys ATA: • Network Jitter Buffer: very high • Jitter buffer adjustment: disable • Call Waiting: no • 3 Way Calling: no • Echo Canceller: no • Silence suppression: no • Preferred Codec: G.711 • Use pref. codec only: yes 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 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. Step 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 Troubleshooting If have problems sending or receiving faxes, complete the following steps: Step 1 Step 2 Step 3 Send a test Fax in a controlled environment between two Linksys ATAs. Determine the success rate. Monitor the network and record the following statistics: • Jitter 3-16 Linksys ATA Administrator Guide Document Version 3.1
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