Each of the PBX vendors offers a mobility capability. Some developed it internally. Some, like Cisco or Avaya, bought a third party developer, and some license their offering from a company like OptiCaller Software or Counterpath (formerly FirstHand). There is another set of vendors that offers enterprise FMC that works with any PBX, for example OptiCaller Software, OnRelay, Shortel, Tango, ESCAUX and RIM. This is beneficial to both large and small customers. Large customers may have PBXes from multiple vendors, yet still wish to roll out a unified FMC solution. Small customers appreciate having a choice of supplier, rather than being tied to their PBX vendor.
Read more about this topic: Fixed-mobile Convergence
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