They are referring to SIP 180 and SIP 183. It's kind of a mess (it is SIP) but both are non-final response codes to indicate call progress. Typically speaking, 180 Ringing is returned without media and tells the receiving device (FreeSWITCH or your local SIP phone in this case) to activate a local ringback generator to inform the caller the remote end is progressing. 180 without media is typically used when calling SIP phones. They know that they only actually "ring". 183 is typically used with media. The media contains audio to tell the caller what is happening. Typically this audio sounds just like ringback (depending on region) but it could just as easily be a ringback tone (Britney Spears or anything else), audio from the remote end, or just about anything else the caller might need to know (even an error message). Most carriers *should* consistently give you 183 with media while the call progresses, whether the remote end is actually ringing or not depends. You have to listen to the audio :). BTW, as are most things with SIP these are generalities and many not happen in your environment, most stacks, for example, will handle 180/183 interchangeably - it's the presence of media (SDP) that matters. FreeSWITCH has a multitude of options to deal with these scenarios. First things first - what does your carrier return? On Wed, Mar 17, 2010 at 3:18 PM, Fraser Redmond <fraserredmond@gmail.com> wrote:
Sorry - newbie question: what is the 180 or 183? Can I manipulate that any way?
-- Kristian Kielhofner http://www.astlinux.org http://blog.krisk.org http://www.star2star.com http://www.submityoursip.com http://www.voalte.com