If you are having DTMF issues with your PSTN trunks, you may need to adjust the dtmf option. Perform the following steps to change the global setting for your PSTN trunks:
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Log in to the UCx Web based Configuration Utility
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Navigate to System -> PSTN Cards
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Go to the Settings section located at the top right corner of the page and click on Global Settings
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Under Other Global Dahdi Settings, enter relaxdtmf = yes
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Press the Save button
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Press the Apply Config pink bar, followed by the Reload Dahdi Configuration button.