They both essentially uses the same mechanism. Voice packets are encoded to data and sent as data packets over IP network. However, they both differs in the way that the data is carried and the network infrastructure used for carrying it.
The differences between two include
1. Using 3G or 4G network
2. QoS component
3. Radio Frequency or SR-VCC (Single Radio Voice Continuity) IMS requirement
4. HD Voice requirements
VoLTE packets have 3 times more voice and data carrying capacity using 4G network. VoLTE also has built in QoS components.
4G boasts about having 100 megabits per second speed. VoIP can use either 3G or 4G while VoLTE can only use 4G.
one of the main difference is in the QoS. VoLTE uses IMS network and separate radio frequency to help maintain the quality of the VoLTE transmission. something like an expressway!
When the user leave an LTE coverage area, SR-VCC functions by connecting to the LTE and legacy network at the same time . The radio frequency uses the IMS framework to make this happen.
Since VoLTE uses fewer resources and has simpler compacting ability for the data packets, networks and handsets, these items consume use less energy with VoLTE. This provides greater battery life for each. VoLTE calls take less time to connect than a 3G call.
VoLTE calls take less time to connect than a 3G call.
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