DTMF issues with PSTN trunks

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: 

1. Log in to the UCx Web based Configuration Utility
2. Navigate to System -> PSTN Cards
3. Go to the Settings section located at the top right corner of the page and click on Global Settings
4. Under Other Global Dahdi Settings, enter relaxdtmf = yes
5. Press the Save button
6. Press the Apply Config pink bar, followed by the Reload Dahdi Configuration button.