In Network Rollout scenario, if one operator has only 4G / 5G network and it want to get CS based voice services from another operator over National Roaming then what are the possibilities available for seamless CS voice service. i.e.
- 4G / 5G ( Own Network – Operator A )
- 2G / 3G ( National Roaming with another operator for CS Voice – Operator B )
The major challenge which I see in this case for Operator-A is terminals not supporting VoLTE or VoLTE not activated. In any case these terminals has to go throughput CSFB process to establish call. Under this situation, can CS Calls get established to 2G / 3G and also after call get terminated it can get return to 4G network without any break.
On RAN / Core level via RIM based CSFB and Fast Return we achieve this process to get optimized, can these features help in such case of inter-operator seamless CS call initiation and return.