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SPA122 with 1.2.1 won't save certain DTMF settings
Upon upgrading the SPA122 to firmware 1.2.1 I found that outbound DTMF tones were no longer being seen properly by remote systems. Using the device web interface and changing the Line 1 "DTMF Tx Method" to "InBand" (using "Submit") successfully fixes the problem (G.711 and good link). However I find that after a reboot or power cycle the setting always reverts back to its "Auto" setting therefore again breaking DTMF.
It appears that the SPA122 with 1.2.1 is not actually saving the "DTMF Tx Method" setting.
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