I have found myself with another S/L ringing issue on a Magix

Touch Tone Tommy provided me with a solution that worked great last time, but it appears that only 16 S/L extensions can be assigned as fax.

Here is the problem, warehouse type facility with a large number of S/L phone with line powered loud warbles attached, that do not like the double ring of an outside call.

Is there anyway possible to make outside calls to be a single industry standard long ring instead of the double ring of the magix? Or should I just suggest replacement of the system with something that I know will do and industry standard ring on S/L ports?

Thanks in advance Josh