Question on a use case

hi all,

I am new to JMS and other remoting technolgies. I need to integrate my application with a GSM modem based gateway application. I am looking for an asynchronous transfer between both the applications as both can send each other a message to do processing.
Both the applications are spring framework based. Please let me know which technology/framework can best solve my purpose with least learning and development efforts.
My applications shall be hosted on different physical machines.

Cheers,
Nitin