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.