These products are all based on the GeoTel acquisition.
GeoTel ICR (Intelligent CallRouter) was the base product, enabling many different peripherals (i.e. PBXs like Lucent, Nortel, Rockwell etc. - and IVRs like InterVoice, Periphonics etc.) to be joined together in a functional contact center, although the initial implementation of ICR was in a different context - as a network router for service providers (AT&T, MCI, Optus, BT) through an interface called a NIC.
The NAM was a high-end conglomeration of a Network ICR (NICR) and 1 or more Customer ICR (CICR) suitable for service providers, allowing a hosted solution to be built.
When Cisco bought GeoTel the name was changed to Intelligent Call Manager (ICM) to avoid marketplace confusion with Cisco's existing line of routers. Thus the NAM (the hosted solution) now consisted of a NICM and several CICMs.
Since Cisco had developed their own switch/PBX for VoIP (after the Selsius acquisition) called CallManager, it could also be treated as a peripheral and slotted into an ICM. This became IPCC - IP Contact Center.
A couple of years ago, Cisco branding brought all products under a "Unified" umbrella.
Although the lines are a bit blurry (and I'll probably get corrected on this ), UCCE is IPCC (well, almost), ICM Hosted is the NAM, and the term ICM is mainly used when UCCE is implemented with non-Cisco switches (i.e. not CallManager).
Yeah, it's not that clear cut, but you get used to it.
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