Hi,
Did you mean when having a call with cell phone you cannot join a conference call with dial pad because the users in the conference cannot hear from you?
Did the issue happen when you join a conferencing call with dial pad lonely (not have a call at the same time)?
Did the issue happen only for you or for multiple users?
Please enable logging the Lync server logging tool on FE servers for further troubleshooting.
Here is the link of using the Lync logging tool:
http://blog.schertz.name/2011/06/using-the-lync-logging-tool/
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Best Regards,
Eason Huang
Eason Huang
TechNet Community Support
