We Recently found a bug in the Lync client which stops the Audio Selection Button being displayed if users are not EV enabled.

http://support.microsoft.com/kb/2616187

Working with MS to see if we can get a fix. Will post any further developments.

I have found cases where the CA server do not include SAN names on certs requests.

Below is the command to enable an internal CA so that it allows the issuance of alternative names on a cert request. If this is not set and you
request a cert it will just ignore the alternative names when it issues the cert.

For SAN Certificate usage:
Activate the possibility to request SAN certificates with this CA

net stop certsvc

certutil -setreg policy\EditFlags +EDITF_ATTRIBUTESUBJECTALTNAME2

net start certsvc