[asterisk-users] 180 Ringing with SDP

[Raj Jain]

> >    A cursory interpretation of the RFC suggests that 180 
> Ringing is a 
> > message designed solely to convey ringback, and that it is 
> the payload 
> > of the 183 response that may be used to convey additional details 
> > about the nature of the call's progress.  Therefore, a 180 
> would be an 
> > inappropriate vehicle for early media SDP information.
> 
> Tell that to level 3. :)
> 

180 w/ SDP is valid.