DTMF Problem calls not passing

Dear All
Over the last months am getting complains that calls using dtmf are not passing correctly or not at all.My customers are using mostly ip authentication.Any ideas about this?I have changed over 10 providers hopping that the problem was from provider site but at it seems its from my astpp.
Any ideas?

Hello @cyprusvoip ,

Please refer:

  1. Sofia Configuration Files - FreeSWITCH - Confluence
  2. DTMF - FreeSWITCH - Confluence

Hope it will help you to get an idea about your problem.

Dear Hemdip
Thanks i will check it out.I mostly have problems with customers that are using VOS3000.With other clients i dont have