We are implementing a pilot of Microsoft Lync 2010 and we've been running in to a few little quirks.

We are using a Dialogic DMG VoIP gateway to interface with our legacy telephony equipment to receive calls from the PSTN.

Here is the current quirk that was encountered: any call that originated from the PSTN to a Lync user that was placed on hold would disconnect after exactly 90 seconds. The following information was observed in a Lync trace of the call: