[Freeswitch-dev] Session Progress and RINGING
bernhard.suttner at winet.ch
Thu Nov 4 13:51:09 PDT 2010
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:
There is a RFC for this case (Section: 3.2. Ringing Tone Generation)
What do you think?
----- Original Message -----
From: Anthony Minessale [mailto:anthony.minessale at gmail.com]
To: freeswitch-dev at 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 at 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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