CUCM - Webex Callback DTMF issue

Hi!
    Im having some trouble with webex conferences. When i use the "Callback" feature, i recieve the call but when it asks to accept it, i press the digits and nothing. its lik a DTMF-relay problem but only fails with the Webex callback feature.
Any Ideas??

Hi Juan,
Did you tried from another device?
You can also take that option off, in the admin side you can disable this feature...
see image...
Thanks

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    ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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