I have old-pbx-extension number 207. So I created an extension as 207 whose dial string is Local/207@from-internal
as suggested by jgutierrez but when I try calling out it gives my busy tone. However I observed that if the extension number and the dial string number is different from each other, it works. For eg: 208 be the extension and Local/207@from-internal
be the dial string, it works by calling 207 when I offhook the elastix station phone and dial out 208. This doesn't seem practical. Please tell me what is wrong with it and how to go about?