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Convergence of PSTN to IP,
This review is from: Zoom Model 5801 VoIP Telephone Adaptor - Black (Electronics)Two caveats about this product review:
1 - Yes (as previously stated) configuration of this and other similar devices can be confusing if you are not used to the terminology. However - that's the nature of the technology and associated standards. Don't hate the player - hate the game! If you want a fully featured / functional solution and you're not familiar with IP telephony, you have to accept that you're going to need to spend a few hours at Google University. I did and managed to get this working first time.
2 - To provide context, I'm running my Zoom 5801 in bridging mode. i.e. - The function of this unit in my house is to redirect my PSTN incoming calls to an IP network so I can channel them through a PBX (FusionPBX).
After I had connected the unit to my LAN and configured it with a SIP extension for my PBX, it registered with no problems. I've tried units like this before - namely the Linksys SPA3102. It's hard not to draw comparisons between the two units. Whereas the SPA3102 caused me endless issues with echo on the PSTN line (you may have a better experience) I found that the Zoom 5801 had absolutely no echo. Most importantly - the call quality and volume were faultless.
The package included the unit / power supply / ethernet and phone cables / regional adapters for the cables which you may / may not require.
So now my PSTN calls are being forwarded by the Zoom 5801 in to the PBX (so I can filter out sales calls). That's why I bought it - it worked first time and without the need for endless messing about. I'm very glad I bought it and particularly pleased with the call quality.