Handling Asynch gateway calls between sites

Sorry if this is a duplicate message, but I posted it 20 hours ago now and it hasnt appeared, so i figure something must have gone astray somewhere . This is a new and interesting area for me I'm starting to work with SMS gateways and i've already got it going with a XML http call to a S

Handling Asynch gateway calls between sites

This is a new and interesting area for me I'm starting to work with SMS gateways and i've already got it going with a XML http call to a SMS gateway, but i want to build an interactive app using the built in SMS gateway. Does anyone know if it's possible to have a gateway set up and able to r