[Users] 180 Ringing / 183 Session Progress

[Atle Samuelsen]

Hi

* Klaus Darilion <klaus.mailinglists at pernau.at> [070206 13:56]:
> And it is also common that a gateway sends both - 180 (ISDN Alerting) and 183 (ISDN Progress with inband audio available)
note: CAN send both :)

- Atle
> 
> regards
> klaus
> 
> Jerome Martin wrote:
> >Also note that on ISDN/SIP gateways, you often have many options to
> >fine-tune this. Like progress indicators mappings, play local tone or
> >just forward distant, etc.
> >On Tue, 2007-02-06 at 11:17 +0100, Atle Samuelsen wrote:
> >>Hi Sam,
> >>
> >>* Sam Lee <sam.lee at super.net.sg> [070206 11:09]:
> >>>Hey Guys,
> >>> Is it mandatory for SIP servers to generate to UA 180 Ringing to inform
> >>>them that the called party is now ringing ?
> >>No
> >>> The reason i'm asking is because I am seeing strange results using
> >>>different UAs.
> >>> Using SIP clients to call out , instead of seeing 180 Ringing , i see
> >>>183 session progress even before call was picked up.
> >>This is nothing wrong with this :)
> >>> On some sip client , ring back can be heard.
> >>good, they support early media
> >>>On some others , ring back cannot be heard.
> >>Bad,, they do not support Early media
> >>> Is there any reason to suspect that these UAs needs to receive 180
> >>>Ringing before generating any ringback ?
> >>In general: 180 == Generate Local Ringback.
> >>183 == get RTP from callee, and play it (often used for network
> >>announcements, calls to gSM and simular)
> >>
> >>- Atle
> >>> Regards,
> >>>Sam
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> >>
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> 
> 
> -- 
> Klaus Darilion
> nic.at
>