I'm not sure how widely used Envox IVRs are so I'm not sure what kind of response I'll get...

Anyway, has anyone tried to call a MySQL Stored Proc from an Envox DBSQL block using output parameters, and got it to work?

Envox appears to just plug in the parameters as if they where literals, which works fine when it comes to input params but falls over with:
OUT or INOUT argument x for routine db.MyProc is not a variable
whenever an output param is used.

Let me know if you've done this successfully!!