Hi
Thanks for your post.
The issue may be DTMF related.
When you hear the Digitial Receptionist, if you enter an extension number, does this work?
If you call the Digitial Receptionist internally from a supported phone or the 3CX Soft Phone does the same issue occur? Basically this will segregate the issue, as, if the issue is not present internally, we can look into the Gateway or provider.
What Provider and / or Gateway are you using?