Hi, session progress does have SDP which will then go through to A. But on the display of A it will only display "session progress" and not Ringing. If A is now a ISDN Gateway and has to signalize RINGING into the "ISDN world". I am not sure, if RINGING will be used for A to generate the ringback tone for itself on every device. This behaves on the client/device configuration. There was a nice discussion about this "issue" on the sip-implementors list: http://www.mail-archive.com/sip-implementors@lists.cs.columbia.edu/msg06400.... There is a RFC for this case (Section: 3.2. Ringing Tone Generation) http://www.rfc-editor.org/rfc/rfc3960.txt What do you think? Best regards, Bernhard Suttner ----- Original Message ----- From: Anthony Minessale [mailto:anthony.minessale@gmail.com] To: freeswitch-dev@lists.freeswitch.org Sent: Thu, 04 Nov 2010 16:54:30 +0100 Subject: Re: [Freeswitch-dev] Session Progress and RINGING
no, once it gets session progress it will not send any ringing. The sip side 180 ringing is used to tell the phone to generate its own inband ringing.
does your 183 session progress contain a sdp?
On Thu, Nov 4, 2010 at 10:25 AM, Bernhard Suttner <bernhard.suttner@winet.ch> wrote:
Hi,
A ---> FS ---> B
B does send a Session Progress to FS. FS will forward the Session Progress to A. B does send a RINGING to FS. FS does _not_ forward this to A.
Could it be, that the check the switch_test_flag(channel, CF_EARLY_MEDIA) in mod_sofia.c within the INDICATE_RINGING section is wrong. I think it is allowed to send the Session Progress first and later the RINGING. The ringing is for example for SIP/ISDN gateways necessary.
Any hint is appreciated.
Best regards, Bernhard Suttner
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