I had an interesting behavior found by customer recently, he tolds me that when he is reaching the voicemail of one of his user (skype call), voicemail language is in English no matter the UM dialplan…
When I tried to call the user from my mobile, I got the voicemail in the right language (french in our example).
I performed multiple tests and got those results :
- Internal Skype call -> wrong voicemail language
- Skype call from federated partner -> right voicemail language
- PSTN call -> right voicemail language
I compared the Skype for Business logs between internal call and federated partner call and found no difference, the same UM diapl plan was called…
Then I finally found that it was due to the caller mailbox language ! If the caller is having an Exchange mailbox in English then he will reach a voicemail in English.
So this is not an issue but it is per design !