FXO disconnect problem

[cmcsales]

I am having a problem, when i dial from an fxo to fxs even when i onhook the phone it doesnt disconnect and the phone connected to fxs keeps on ringing for 180 secs.

[a-vazquez]

This link on disconnect problems may be helpful:

http://www.cisco.com/warp/public/788/signalling/fxo_disconnect.html