Is it possible to conduct a real experiment to make voice call over IP to test NFV resiliency using test-bed?

If Yes, is there any open source VoIP servers and client to use them as VNFs in the environment?

How to implement the VoIP server on vIMS, if possible?

Considering the following requirements or your advice:

Scenario: testing real voice call on NFV.

Method: prototyping or test bed.

Metrics: delay, voice quality, packet loss

OS: Linux (what is preferred distribution?)

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