 How can I use fax machine with Linksys (Sipura) SPA series devices?
In general, a fax machine should work on a SPA just fine provided you have a high-speed, low latency Internet connection. The default settings should properly detect a fax and switch to G.711. The service provider must also support G.711 and turn off echo cancellation when the fax tones are detected.
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Eric Chamberlain | 
Linear Mode
