Hi, and welcome to Beoworld!!
The connections for your Beotalk should be as follows (other Beoworlders please correct me if I've missed something):
Power socket from wall to 3 way splitter
Phone socket to 3 way splitter
Beotalk to 3 way splitter
Then just follow the manual to set it up!
My B&O: 2009 Catalogue and Pricelist