Reason #2 of shifting to WINGS Platform:
The current platform supports only one transport.
Practically all platforms of other vendors as well as self-written solutions work to the utmost only with one transport (for instance, only SMS-system or only IVR-system or only USSD-system).
The implementation of the second platform will have as a consequence much difficulties and inconvenience related to the integration of two crucially different systems. As for the independent implementation of the additional transport, finally it will cost much more than the implementation of a ready solution.
Having shifted to WINGS platform you can extend the platform any time by necessary transport modules (for instance, to begin with SMS/MMS/WAP, and then add IVR or USSD) and at the same time have a single integrated system.