Thanks to AvayaTier3. Command "list extension-type" helped and 55900 was there as remote-access. Idk what is it. We've never doing this and station 55900 worked normally until sep-2021. Anyway thanks for support! Problem solved.
Hello everyone!
Before September 2021 we had 2 servers s8500 in 2 different locations (let it will be server1 and server2). There was station 55900 on server2. Then we make an optimisation and switched off and dismount server2. G650 of server2 was joined to server1 via net as other port-network...
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