CID prefix for a incoming call on a cisco sip phone does not work because the phone rewrites every anonymous call to “anonymous caller” (or any other language) in the display.
Is there a way to modify freepbx or asterisk that anonymous calls are presented as “unknown” to get the CID prefixes working with cisco phones? Phones from every other brand shows the cid prefix correct, this is not a setting problem.
I’ve searched the internet and many people have this problem but never found a solution. See http://sipvoipnews.blogspot.nl/2009/10/ciscolinksys-spa942-spa962-anonymous.html?showComment=1375293906530&m=1#c4105311536999407470