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Iphone touch tones not recognized by Auto Attendant on NEC Systems

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If a voicemail does not respond to touch tones from an iphone try these changes on your iphone:

The DMTF issues seems to be caused by using LTE Voice on the iPhone 6. I was able to resolve this issue by changing my LTE settings.

Go to: Settings->Cellular->Enable LTE->

Change the setting from Voice and Data to Data Only

Reboot your phone.

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