3rd party paging integration

[#1]

I am trying to integrate a Symetrix 421 paging to Cisco 2811 router.

Should I use a FXO or FXS port and also doyou have some configuration expamples.

Thanks

[#2]

Hey Rob justed wanted to let you know it worked like a champ. The client got that part and i integrated it with a FXS port on router and paging is working perfectly.

Thanks for the help

Have a great day.