But it's going to take awhile. But it's coming. I see it arriving in four waves. The initial areas of penetration will be those applications that don't touch, and therefore don't put at risk, the services that exist today. No voice-related services are touched, threatened, modified, or lost.
Performance is good.
Costs are reduced. Integrated Access . Over last-mile WAN access links because the bandwidth is so expensive, it pays to put terminal equipment on each end to merge support for all services. TMUXes have been the traditional vehicle to achieve this. In recent years, some have moved to the use of ATM service MUXes.