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I'm surprised that (it seems) google isn't using Multipath TCP to carry the VPN traffic to google. This would allow it to switch seamlessly between LTE and Wifi
by edude03 11y ago
I'm surprised that (it seems) google isn't using Multipath TCP to carry the VPN traffic to google. This would allow it to switch seamlessly between LTE and Wifi and in theory even LTE and LTE while maintaining the VPN connection and thus the call.
In fact, Apple uses this tech for Siri to reduce latency on voice queries.
- ndrarmst 11y ago(author here) I didn't have a chance to test how the VPN works, but even if they were using MPTCP the switch wouldn't necessarily be seamless. Especially how they are using it now - which hands over a Wi-Fi call (which is data) - to a cellular voice call (not data). It's a subtle point, but calls over cellular are not data, so they are not using TCP/UDP/MPTCP/etc.
- toomuchtodo 11y ago> but calls over cellular are not data Does this change with VoLTE? https://en.wikipedia.org/wiki/VoLTE https://en.wikipedia.org/wiki/VoLTE
- ndrarmst 11y agoYes - with VoLTE, calls are also data.
- edude03 11y agoI see, for some reason I thought it was Voice over IP tunnelled to google via VPN (over wifi or LTE). My mistake.
- ndrarmst 11y agoExactly. They are doing VoIP over Wi-Fi (VoWiFi), but not VoIP over 3G/LTE (which is VoLTE if you follow certain standards).