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Greetings and Happy New Year! I hope everyone's 2018 is off to a great start. I received an interesting problem recently that I wanted to share. Below is an email from a client (I'm paraphrasing): " Josh, Exchange Unified Messaging (UM) is no longer working internally. People can call in from the outside, reach UM, and leave messages just fine. However, our own internal users cannot call eachother and leave a voicemial. Calls internally either go to dead air or receive a busy signal. Is this something you can help us out with?" Of course I can help! 😃 The client has a hybrid environment with their S4B severs on premise and Exchange environment in the cloud. Since UM must reside in the same place as the Exchange mailboxes, their UM environment resides in the cloud as well. The customer connects to their O365 tenant via Edge federation (this will be important later 😉). I decided to take a trace via CLS logger on the FE server of a failed internal VM call ...
