On 4/11/12 10:37 AM, Alex Balashov wrote: > Between RFC 3398 and 4694, I am unclear on whether the 'npdi' parameter > can only appear in the user part of a sip: RURI: > > sip:5551212;rn=...;npdi@domain:5060 > > or whether it can also appear in the domain part: > > sip:5551212@domain:5060;rn=...;npdi > > All I can find are references to the idea that these parameters appear > "within" the Request URI. Are both cases valid?
npdi is defined as a tel uri parameter, not as a sip uri parameter. It makes its way into a sip uri based on the embedding of the body of a tel uri into a sip uri. This results in the parameter appearing in the user part of the sip uri, as in your first example. The usage in your 2nd example is a mistake. There is no definition of npdi as a sip uri parameter. But its my understanding that this is a fairly common mistake - to the point that SBCs are prepared to deal with it. Thanks, Paul _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors