To solve problems efficiently, Wireshark, free network analyzer, is a useful tool to monitor SIP and RTP packets.
If your UA (phone) shows a 3 digit numbers or “Not Found” message while it gives you a busy tone, or if there is no response code given, please try to search a response code using a network analyzer, such as Ethereal.
If you found a response code, please search for corresponding solution for the error code (ie 404, 484, and etc) in Brekeke Wiki. If you can not find any related error code, please search for related problem on FAQs or Support Forum and try to find an applicable solution.
To view a topic of your interest, please click on the topics listed in the left column.