External Paging through Asterisk

I’m replacing my Meridian Option 11 with an Asterisk PBX. I’ve got parking calls covered, moh covered, even the few pots line requirements covered. My problem is that I need to be able to hook into the existing external paging system. On the Meridian, I simply connect to the paging module though a line card (go off hook, open the circuit, and the audio path is open). I’m wondering if I can use my PC’s internal sound device to accomplish this and if asterisk can communicate through it when asked to do so. Has anyone faced this problem or seen a solution in your travels. Thanks in advance.