[Spce-user] 180 Ringing with SDP

Daniel Grotti dgrotti at sipwise.com
Wed Nov 29 06:10:22 EST 2017

NGCP does not send any ring back tone, cause we do not generate them.
What your provider is telling you is not correct.
Sending back a 180 RInging means that the UAC should generate the ring 
tone locally.
There is no requirements in RFC saying that a Class 5 (or proxy) must 
generate a ring tone vie SDP.
NGCP forwards back to the caller what it receives from the callee.

This is a problem of your provider, not on NGCP.


On 11/14/2017 05:14 PM, Christian Osburg wrote:
> Hello,
> I´m using SIP:Provider CE Edition here in Germany.
> My callees didn´t get a ringtone when they call a subscriber of my NGCP.
> My upstream provider told me that my NGCP is sending „180 Ringing“ but 
> without SDP to him. Thats the problem.
> Is it possible to tell NGCP that SDP should send within the „180 
> Ringing“ answer?
> Thank you for your answers in advance.
> Kind regards,
> Christian
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> Spce-user mailing list
> Spce-user at lists.sipwise.com
> https://lists.sipwise.com/listinfo/spce-user

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