The problem you're describing is typically due to a dial plan syntax issue in your ATA. Check your dial plan for typos or errors.
Refer to page 5 of the PDF guide:
viewtopic.php?f=15&t=16206#p64088.
Login to your ATA. Navigate to Voice-->Line Status-->Last Called Number. If you just see "4", using your example, or incomplete phone numbers, you
should know what the problem is: the problem is your dial plan in the ATA. If the ATA is simply sending "4" out, that's insufficient to complete the call.
There's a problem with the ATA's dial plan.
Router settings are not the problem.
By the way, the engineering team that designed the PAP series left and eventually started designing Obihai ATAs. They are the true successors and not the SPA series.
https://forums.redflagdeals.com/freepho ... #p21479663Pianoguy wrote:The PAP/SPA family of ATAs were an industry standard for many years until Linksys EOL'd them in 2012. Did you know that not only were Sipura and Obihai ATAs designed by the same engineers, those engineers also invented the ATA at Komodo technology 15+ years ago? OBi ATAs are really the latest versions of the PAP/SPA ATAs - granted, with more/better call routing features, better hardware, and better audio quality - but the hundreds of thousands of people who used PAP/SPA ATAs before Obihai went on the market would likely not call a genuine PAP/SPA garbage (with the possible exception of the SPA3xxx).