Skype for Business telephony calls doesn’t work after SBC IP address change

Recently I have been involved in works for my client, where all IP addressing scheme was change for particular country. Skype for Business infrastructure involved in this change was: SBA (Survivable Branch Appliance) and two SBC (Session Border Controllers).

Changes on Sonus SBCs + SBA went smooth as per procedure, but during tests after change I have discovered that telephony stop working. All the infrastructure was configured using FQDNs and DNS entries were configured properly so what a h….?

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