https://support.microsoft.com/en-au/topic/you-cannot-join-an-office-communications-server-2007-r2-conference-by-using-a-telephone-when-the-call-is-transferred-83ed7633-d3ed-a065-aa3c-a4bb05e42cd2
Fixes an issue in which you cannot join an Office Communications Server 2007 R2 conference by using a telephone when the call is transferred. This issue occurs...
office communications servercannotjoinconference
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