Setting up an external speaker, of some sort, for 4 SPA504G phones running on UC560

[Hermann Koster]

Hi:

I have about 25 Cisco SPA504 phones connected to a UC560. I have a question, 4 of the phones are members of a blast group so when and inbound call comes in all 4 phones ring simultaneously. Now the question is, can I, somehow, install a wall or ceiling mounted external speaker so when a call comes in it rings on that speaker?

Thanks in advance for any assistance you can provide.

Hermann