Asterisk and Cisco Router FXO Incoming Call

Right now, my cisco uses plar 100 to get to the sip session and destination pattern 100 and session target ipv4:xxx.xxx.xxx.xxx to poing to asterisk (debian7 apt default version). My dial plan has exten => 100,1,Answer ()

This works as long as I use clid strip in my cisco dial peer voice voip. As soon as I remove it calls go nowhere.

This may be just a very poorly documented sip mangling by cisco that is causing this (not sending clid info in the correct setup message) or it is how asterisk deals with clid’s.

By the way, this site has helped me understand more clearly on how cisco and asterisk need to be setup to work together. If I didnt need caller id then it would be working perfectly! Thanks.