a- tor may take into account the outsourcing of their capabilities to a public cloud; nevertheless, this may be used to organize Telco resources in a virtualized way. In this way, it is possible to have a fine grain tuning of the resources in use and the exact cost of them, clarifying if the revenues from the services are in the guidance of the forecast business plan. From the point of view of OPEX (Operational Expenditures), it also may be a great cost reduction, since it unifies procedures and maintenance interfaces. One of the most powerful skills from the Telcos is the ability to manage non- stop services. In that way, the five 9s paradigm is a Telco characteristic. This know- how could be a great contribution from Telcos in order to operate Cloud services. So, it can foresee new business lines with a hybrid approach, where Telcos can offer cloud infrastructure to their end users also deploying the different services. One of the current missing capabilities for the cloud is "Communications as a Service" (CaaS). This is an Achilles-heel for its usage into the Telco world, although it cannot be ensured any Quality of Service on the communication. Most of the current providers just bypass the situation declaring that their communication infrastructure is just enough for any application. Also in this case, the IMS ser- vices have special needs in the areas of the communication and interconnection with the operator infrastructure. This means that the interconnection of actual infrastructure may not be as easy as it is in other Internet services; most of them are based on asynchronous interactions over HTTP. One remarkable aspect is that into Internet a wide development of the Quality of Services technologies has failed till now, mainly due that it has not been required by end-users. Perhaps with a convergence of Internet with IMS, Internet networks may gain capabilities that guarantee some of the communication skills without losing the freshness of Internet. The convergence of both worlds implies to consider the c