Cisco WLC 5508 arp issue and one way audio problems

[CKluck001]

I have a weird strange problem going and it involves Vocera and one way audio. I recently updated my 5508 controller to 8.5.152.102 and my 9800 to 16.12.1. Randomly my vocera badges are getting one way audio now, I am not sure what is causing it. 

Vocera, is blaming this on an ARP issue, I decided to run the show arp on some access points.

Well on the 5508 controller with 5 or more clients I am seeing zero clients in the arp table

On the 9800 controller with 5 or more clients I am seeing 5 or more arp entry's. 

I am not sure what should be right. Should I be seeing arp clients on my access points, connected to the 5508?

[marce1000]

 - I tend to believe this 'ARP statement' from your device vendor is as good as bogus , you may want to debug a client-device with the client-debugging tool available on the page below ; whilst your at it you could also have a sanity check of your controller-configuration with the Wireless Config Analyzer :

 https://developer.cisco.com/docs/wireless-troubleshooting-tools/#!wireless-troubleshooting-tools/wireless-troubleshooting-tools

 M.

[HaifengLi]

If it is a locally switched wlan, there may be no client information in the arp table.

[patoberli]

Also there was an ARP bug which was fixed in recent 8.5.161.0, but only for Flexconnect Wave2 APs: CSCvs25798
Full release notes: https://www.cisco.com/c/en/us/td/docs/wireless/controller/release/notes/crn85mr6.html
Please note, I'm not sure if it's compatible with the 9800 for roaming, or if you need to stay on your special image.