BEST CASE: your software support company is a Telema Certified Partner. In that case joining Telema is the easiest and fastest. Also, Telema will not charge the end-users of Certified Partners for the activation. Check the activation terms of Telema Certified Partners here.
GOOD CASE: If your software supports Telema eDoc format, the joining will be faster, simpler and cheaper than with softwares that don't support Telema eDoc format. Check if your software supports Telema eDoc format here.
FINE CASE: If your software does not yet support Telema eDoc, contact your IT support and find out how much will the set-up cost.
INTERESTING CASE: your software is listed in Telema Certified Partners list, but it is supported by another Support Company - i.e. your software is Dynamics NAV and support company is Columbus. In that case Columbus needs to acquire the Telema Module from BCS Itera.