Hi Jaber,
I think there are many other advantages to IMS over other forms of VoIP - probably the biggest being standardization/interoperability between different vendors' solutions. For example, VoLTE (i.e. mobile) requires IMS, and most fixed-line providers are either already running IMS or migrating to it. In terms of QoS, media is arguably much more important than signaling. Project Clearwater does not get involved with media directly. A fully-featured P-CSCF (such as Metaswitch's Perimeta) would achieve this through the P-CSCF reserving bandwidth via the PCRF. (Project Clearwater's Bono is a very basic P-CSCF and I don't believe it's been deployed in production.) Cheers, Ben
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