Lync Phone and Voice Conferencing PIN setup
To set your phone or conference pin follow these sets (this is not your voicemail pin)
Once signed into your Lync Client, choose the Tools menu, then Dial-in Conference Settings. You may use this pin to sign into a conference room phone so that any long distance will be billed to your number and not the conference room account.
Then sign in using your universal login and password.
Once In select Reset your Pin or Reset your assigned conference information.