Hi Paul,
Would it be feasible to use a "data" URL scheme as defined by RFC 2397? data:[<mediatype>][;base64],<data> With this syntax, the "mediatype" and "base64" are optional and may be omitted leaving the ",<data>" available for carrying information as an alternative to the Alert-Info generic-param. Though I would agree that depending on the application, there may be a better alternative. Thanks, Jim -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Paul Kyzivat Sent: Tuesday, May 12, 2015 9:12 AM To: sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] URI value mandatory for Alert-Info? On 5/11/15 9:12 PM, Alex Balashov wrote: > Hello, > > The ABNF grammar for Alert-Info is: > > Alert-Info = "Alert-Info" HCOLON alert-param *(COMMA alert-param) > alert-param = LAQUOT absoluteURI RAQUOT *( SEMI generic-param ) > > I have an application that seems to utilise just a generic-param > without a URI. However, I don't see any */? quantifiers for > absoluteURI which suggest that it's optional: > > absoluteURI = scheme ":" ( hier-part / opaque-part ) > > Maybe it's a failure on my part to properly understand ABNF, however. > > My fundamental question is: is there any grammatically acceptable way > to have an Alert-Info header value consisting of no URI and just a > generic-param, e.g. > > Alert-Info: ;internal=xyz > Alert-Info: <>;internal=xyz No there isn't. There was no intent to allow that. Can you say more about what you are trying to accomplish? It sounds like an abuse of Alert-Info. If you explain, maybe we can find a way to achieve your intent. Thanks, Paul _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu<mailto:Sip-implementors@lists.cs.columbia.edu> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
