How to configure pstn extensions

hi…

     i have asterisk four cliens how can i call a pstn call from my clients. what are the configuration files  i have to  configure? 

if possible send some examples

thank you

This should be in the users forum

Depends on how you plan to get the call to the pstn via a voip provider or a interface card to connected to the pstn.

for config files and there meaning see link

voip-info.org/wiki-Asterisk+config+files