WHAT IS VOLGA ?

VoLGA is a technology approach for mobile operators to deliver voice and SMS over LTE.Mobile operators evaluating Long Term Evolution (LTE), the next-generation, all-IP mobile access network, realize they must support voice and SMS services from the beginning. So The VoLGA Forum was initiated to specify and promote an approach for extending traditional GSM and UMTS circuit-switched services over LTE access networks.

WHY VOLGA ?

There are few disadvantage with the current working specification of LTE network in the approach to support voice and SMS. The problem with IMS-based VoLTE is that:

(1) The specifications have not been completed. There is no agreed approach.

(2) IMS is an all IP technology, and there is no circuit switched connection. Mobile operators on the other hand have circuit switched networks. So the proposed method is to use CSFB to support  SMS and circuit related service.CS Fallback (CSFB) was defined in 3GPP as an interim step to overcoming the voice over LTE problem.