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An introduction to SIP, IMS, and other modern voice technologies
What is SIP?
What actually happens during a SIP call
What is IMS, IP Multimedia Subsystem?
How are SIP and IMS related?
IMS as an architecture framework for mobile operators
The key IMS / VoLTE building blocks
Comparing a minimal IMS core to a minimal SIP core
A few more necessary or helpful elements for building a VoLTE network
How PortaOne can help