Yealink phones service unavailable but rest okay

[MHA]

Hi all,

Yesterday all of our yealink (hot-desking enabled) phones failed to communicate with our 3CX for some reason. No changes have been made recently. They were not performing any functions and users were not able to login or logout or make any calls. Yealinks returned a service unavailable error. We have other phones such as Cisco which were unaffected. I restarted the PBX which seemed to resolve the matter however not clear at present what could have caused this problem.

Can anyone offer any insight at all?

Thank you

 

[cobaltit]

I can make several wild guesses but without logs or future details (models, firmware versions, PBX location, connectivity, etc) they would be just that.