I am a new user of this particular application, so, I may report new issues on the road, but so far works fine, at least for a basic conference call dial in number + access code, aside the issues below:
1) As others had pointed out the lack of ability to insert “#’ or “*” in the “Access code” (Add guest access).
2) Edit button also used to “add” new number, kind of confusing (interface wise).
nknd200 about FreeConferenceCallHD Dialer