Bear with me here - very new when it comes to Lync :)
We have a very simple installation up and running right now, with only Lync software clients installed. I've now been requested to install two Polycom CX3000 conference phones.
It looks like these requires a phone number to work correctly, so we're going to order a small SIP trunk for Lync plus two voice CAL's so that these two devices can make outbound/inbound calls outside the Lync organization. That should be nice and simple to set up.
The question however is how intra-traffic is going to be handled between regular Lync users with the Lync client and the conference phones. Will they accept "Lync calls" as Microsoft calls them - as in calls without any telephone numbers? Can you mix attendants in a call where some are via enterprise voice, and others are via regular lync calls?