Hello, After testing some different phones, codecs and combinations of them I noticed that some of my GSM applications didn't work anymore. So after finding out what it was (no codec support) I was thinking, why * couldn't give my that error directly (-d -vvvr did not give any feedback). One thing for sure, it didn't do any codec translation or gave an error about that. An error if -> an application <- can't agree upon codec would be nice, is there allready a way to see this 'newbie' SIP errors? Stefan