We are migrating from an extreme/enterasys/identifi wifi solution to a cisco catalyst 9800 wifi solution. In total we are replacing 4 extreme controlllers and 700 APs. Everything is working as it should. Except our mitel 5624 wifi phones. Both controller set ups are central switching and are located in the same datacentres. The voip SSID on both solutions leaves the controllers on the same vlan with both the extreme and cisco solution having layer 2 connectivity on that vlan.
For some strange reason, when a wifi phone is connected to the cisco solution it can call a wifi phone connected to the extreme solution, but there is no audio. All other calls to other phone systems on different vlans works fine. There seems to be a networking issue somewhere which is preventing the calls to work from extreme to cisco and vice versa, these phones are in the same broadcast domain just over different controllers.
Has anyone experienced anything similar?
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