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Voice over LTE

Hello,
I just want to understand a basic difference between Voice over IMS and Voice over LTE.
Thanks,
Sarma

Re:Voice over LTE

Since LTE is completely packet switched, there are different methods to implement voice over LTE (VoLTE):

1. Use a fallback Circuit switched 2G network. (Not an ideal solution).

2. Use an IMS network alongside the LTE network.

3. An other approach VoLGA (Voice Over LTE via Generic Access)