All: I tested echo test by dialing *43 under Asterisk configured by FreePbx by using x-lite softphone. I could not figure out how the call is routed to context from-internal. In sip_additional.conf, I have three extensions defined as 2826, 2800 and 2801, which all are defined context as from-internal. FreePbx doesn't define any entry for *43 as an extension in sip related config files. I greped from-internal for all configure files, I did not find any definition of context from-internal in sip related files, except three sip extensions. After I dialed *43, cdr did show the content of dcontext as from-internal. Can anyone explain how the call to reach the context from-internal, or how do I get a context trace for a call? Many thanks. Tielin