the most risky about this is about possible bottle neck GboFR can be having. so when you swap to GboIP you will double or triple your current traffic and have great impact over your access network. So you have 2 scenarios 1.- if you don’t have over demand on radio ressources you ‘ll have the same IP traffic that you had on FR.
2.- if you are having oversuscription on your radio access it is needed to evaluate it to estimate the ip traffic you’ll liberate. that’s where fun engineering takes place