The AP and wireless aspects of the phone are layer 2, and have nothing to do with gatekeeper interaction. My best guess is a gatekeeper configuration issue or bug on the gatekeeper side. Never seen that behavior though, I would run it by Cisco and see if they are aware of anything. Anyone else out there run into this?
I work for Symbol on the Netvision phone. Aironet configs to pay attention to include:
Set DTIM rate to 10 (default = 2)
Disable AiroNet Extensions (default = ON)
Use of Data Encryption by Stations to either Full or No Encryption. Optional does not work
Set to optimize for range, when enabling more than one rate rather than optimize for data rate (default = optimize for data rate) Avoid 11Mb ONLY configurations. Let the AP scale the rate so it is not all or nothing communications at 11Mb
Okay, we made all this change on our Cisco APs and installed the new Firmware Image 11.10T. But we have still problems with the Symbol phones.
Really unexpected behaviour was shown by the phones. for example: the phone worked well during the day and suddenly you hear a beep form the phone. Than an the display: no network -> out of svc -> logging -> out of svc and so on. We used the 3.50-32 release, changing now to 3.50-37. Next week some experts from Symbol will be onside with me at the Customer. so next week I can tell more about Cisco AP340 and Symbal DS Phones. Hopefully our customer will not through out the Phones till then.