Log into the WLSE and review the devices which are reporting to it, ensure all devices are in there.
While the tools mentioned by the gentlemen before me are all well and good it misses the mark a tad. Review if you informed them to do any sort of deployment for Voice. Voice and data requirements are quite different.
review your 'Faults' in the WLSE, if you see alerts concerning high number of retries (ie 600/700 retries per min) i would bring this to their attention.
Review the documentation that they give you... Did they properly alternate channels? Only channels 1,6,11 do not overlap.
If your buildings are in multiple different states/provinces... You can do a spot check, most adapter client utilies permit you to do a site survey of sorts. The cisco ACU has a nice tool which will allow you to see SNR and signal strength. I have included the minimum signal strength and minimum signal to noise ratios below as posted by Cisco.
IntroductionHow to use the Wireless LAN Controller Configuration Analyzer (WLCCA)
Javier Contreras is a Senior Tech Lead for the Wireless Business Unit in Cisco, with over 2 decades of experi...
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(#)For this reason being that : - application that doesn't use multicast, sends one copy of each packet ( data unit of traffic at layer 3 ) to each client (" who seeks the traffic ).- application that does use multicast, sends ...
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...