We use ansible in our company to deploy every kind of service including voip systems. We have made lots of iterations and we hope everybody can make use of our experience. automation makes systems uniform and the deployment much faster while less complex for developers and administrator. an automatic way of deployment can be used for one system only as well as a high scaled infrastructure with several hundreds of systems. No matter if the systems are on bare metal or some kind of container ansible can be used.
I gave a talk at astricon very similar to what i am planning here. During this talk I will concentrate more on the ansible specifics to be used for voip services.