title: Mobile Value Added Service, MVAS protocols
body: <p>I study the construction of mobile networks and began to study MVAS. But could not find a specific iinformation what protocols are used in the VAS or MVAS.</p>
  
  <p>I understood that main protocol using SMS - it SMPP.
   
  It would be great if someone made ​​a list of the protocols used, or links where I could read more information about the protocols used.</p>