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> LTE/4G demonstrated the success of standards in that it "just works" as long as you have the right bands in place. Since most (modern) phones have the bands n
by the_only_law 5y ago
> LTE/4G demonstrated the success of standards in that it "just works" as long as you have the right bands in place. Since most (modern) phones have the bands needed for the main global markets, you can pop in a SIM card and get connected anywhere.
VoLTE is far more complex, and there's network-specific configurations "hard-coded" into the (usually) Qualcomm modem firmware, including IPSec parameters for communicating with the IPsec endpoint in front of the IMS SIP server.
I sort of get the feeling this is by design.