I have been the disgruntled owner of a UC520 for one year now. I have gone through five IOS upgrades and eight - yes count them 8 – CCA upgrades and still the most basic configuration of an intercom does not work. If you are simply trying to apply a single intercom between two phones it will work. If however you are trying to create a 7x7 grid of intercoms between seven 7975G phones it is a disaster. It starts out innocently enough with the first few working. After a about 15 have been added is when the gremlins come out. Previously applied intercom assignments go missing on the phones or show up as (Unknown) users after a reload in CCA, custom labels apply randomly and revert to default naming when using shared extensions, custom names do not apply to the phone despite showing up on CCA. It is a complete mess. The only fix is to go in to CLI, delete all the created ephone-dn’s and start a fresh, however, within 15 to 20 changes or saves the gremlins will come back. I have had cisco engineers/forum moderators work with me in the past on this to no avail. I have even had once cisco top tech really take the bull by the horns and arrange a conference call with me and the top development brass to show them how obnoxious this is. I have worked with TAC time and time again. Each time the TAC tech (great guys) put another completed case in their cap by methodically using CLI to build a 23 user 107 intercom matric of ephone-dn’s only to have the precious work demolished the second I open CCA and change a single config. I have replaced the UC520, reloaded it dozens of times, upgraded each main stream release, b*tched and b*tched on this forum, waited with ever dwindling enthusiasm for each release thinking, maybe, just maybe, this time it will work and on and on and on.
Cisco is actively trying to make the SCBS system literally do everything but clip your toe nails in terms of features, yet they can’t make this one simple century old telephony feature work despite literally years of development in CCA. The intercom has to be the oldest PBX feature in history. I mean ma'Bell old. What really ticks me off is this crazy development track they are on. Don’t get me wrong, having the ability to pop-up a web-ex meeting request on your cisco phone at the same time it pops up in nine other locations on your digital life may be a god send to some, but for the love of the basics, STOP!!!!! Stop development, stop making this never ending list of features that are never tested though to fruition, stop coming out with new hardware offerings for the same bug ridden management system, stop working on CUE until you fix CCA, stop wasting your technicians time on basic bugs like this. Please, Please, Please, Please just give me a working Intercom configuration in CCA! PLEASE!!!!! Escalate this to the top, get all the necessary levels of middle managers in a room and make a commitment to just make the intercom work. One simple bullet-proof feature in CCA that your development team can celebrate. I mean baby-steps here cisco, just an Intercom. Once you have mastered that, then you can put the SCBS on Mars or Pluto. Again, baby steps!