Hi,
I've submitted a patch that implements USSD messaging support.
(useful for checking and refilling account balance and other provider-specific usage)

Here is the JIRA ticket:
http://jira.freeswitch.org/browse/FS-5078

If this feature is considered useful, I would appreciate if it's integrated in git.

Thanks Yuriy, I'll have a look into it asap next week.

Thanks again, yes is considered useful and grateful received.

-giovanni