In the Help Desk environment that I work we do not have any pagers or push-to-talk wireless devices because of poor signal strength within our building. At one time we had pagers from a regional carrier but with all the interference within the building the service was not reliable. I just started my research for on-site paging systems and am wondering what some well respected vendors might be. What I am also interested in hearing about are cases of both good and bad implementations and what could have been done differently to make it a success.
