[otrs] Queue ID in ticket number or hook?

Hi, A customer of us does support for multiple customers of his. Every customer has his own queue with all the settings and e-mail addresses etc. He wants the ticket number or hook to contain a part of the queue name. So when someone calls and says I have ticket nr XYZ-0123456, he knows it's a XYZ customer. Is this possible? Maybe I could write a new ticket number generator, but I don't know if the queue is known at the moment of ticket number generation. And what to do when the ticket changes queue? My feeling is that it's not a smart thing to try, since a ticket is not locked to a certain queue and changing ticket numbers when changing queues seems really awkward to me. Any thoughts on this? Regards, Richard