@Wash, it is good to know that Queen Bee is offering the apn facility, amazing stuff, good for future projects such as remote vpns. :-)

 

The problem I now have with all mobile services is that they have mastered the "Tortured Internet Services" beyond what was originally intended to be done on to tcp. It is impossible to get a reliable service on sensitive traffic unless you go on fiber/wimax and again this will depend on provider. The Internet Protocol has been beaten and beaten and beaten into submission! Nowadays, you get fast http speeds but everyting else is queued......

 

Orange 3g+ was the darling of service providers, now I believe it is history too.

 

I suggest you give iBurst on AFOL a try on your idea, they may even have the possibilty of creating an end-end cct mapped to the mac addresses of the modems  for your voip scenario. Less towers and less tinkering on frames rather than packets....... Have a read of the iBurst platform and it may give you a good idea as to why it is better suited.

 

I could be wrong on AFOL but am soon to try them. HTHs.