Choosing the voice technology within 4G radio access is a decision of which path to take, and it is generally not the same path for every operator.
Although there is no unique recipe for the short-term path, it is possible to design a solution based on an IP Multimedia Subsystem (IMS) as a long-term target architecture for the delivery of voice services and that's what David Eror, CCNP and CCSI at NIL Data Communications is talking about in March IP corner article.

Read more in the attached document

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