[Freeswitch-users] double dtmf

Hello community, I have some issue with delivery of dtmf.The call flow is:one sip provider - FS - second sip provider - endpoint which expects correct dtmf On FS I have simple custom lua application which implement logic of calling cards system. I have not issues when I call to lua application. I can enter destination number (by using dtmf apparently) and all works fine. But when I try to send dtmf second time for endpoint which expects correct dtmf I have issue with double dtmf. It is noted that when I call from sip device I have not ANY issues. But I have issue when I call from any cell phone or landline phone. Any ideas are welcomed. Thanks.