[asterisk-dev] Regarding the "progressinband" SIP option

[Klaus Darilion]

Pavel Troller schrieb:
> Hi!
>   First of all, Happy New Year to all of you, and a really big success of
> Asterisk!
> 
>   And now, to the business. I'm a bit misoriented with the "progressinband"
> option in chan_sip. When it is sent to "never", Asterisk doesn't generate
> ringing tone, but sends "180 Ringing" provisional response. The other
> options (no, yes) behaved identically on my setup, causing Asterisk to send
> a ringing tone but not 180 Ringing.
>   What I would like, is to send both of them. 

Probably it depends on the outgoing channel. If the outgoing channel 
receives "ALERTING", Asterisk should send 180, and if the outgoing 
channel receives "PROGRESS", Asterisk should send 183. Which technology 
do you use on the outgoing channel? Is there "PROGRESS" and "ALERTING"?

regards
klaus

For example, on the Linksys
> phones, without "180 Ringing" being sent, display shows "Session progress"
> for all the time until the answer. It's much nicer to see "Ringing". These
> phones also have a "Sticky 183" config option, which allows to keep the
> media stream established by 183 Session Progress open, even when 180 Ringing
> comes back, so I can hear the real media from the switch, not local ringing
> tone of the phone. 
>   The only way to achieve this for me (in 1.6.1.12) was to patch the source
> to return -1 from sip_indicate() even after sending 180 Ringing. It then 
> behaves as I want (if I set progressinband=never, which of course is now
> totally  misleading :-). Isn't there some way, how to do it "legally" :-) ?
> If not, I'm voting for adding it, for example by adding the fourth value
> "both" to the progressinband option, which would make this possible.
>   Are there any objections against it ? If not, I'm willing to prepare
> a small patch.
> 
> 
> With regards, Pavel.
> 
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