I'm new here, so I'll just offer some general suggestions.
The first thing to do is find out exactly what they want to do, and what their budget is to do it.
Do they want a PBX, with separate extensions on each desk? Do they have an operator who will answer all incoming calls?
Are they looking for a keysystem, with all lines at every desk and an intercom?
Do they need features like the ability to pick up a call at another desk, or voice mail?
I hope this helps.
