Re: [Sip] info-event: syntax simplification

[Eric Burger]

I would offer the syntax looks simpler, but the parser gets more complicated. The parser now needs to track state and set tables with direction, instead of simple set tables.

Therefore, I would offer we keep the ABNF as it is.


On Oct 25, 2008, at 7:50 AM, Jeroen van Bemmel wrote:

Moreover, once one lists media types in the negotiation (a subject of a coming thread), we are talking about potentially adding hundreds of mandatory bytes to the message, whereas the simplification proposed below saves at most 30 bytes.

Current draft (with Recv fix):

Info-Package        =  "Info-Package" HCOLON Info-package-type
 Send-Info           =  "Send-Info" HCOLON Info-package-type
                        *( COMMA Info-package-type )
 Recv-Info           =  "Recv-Info" HCOLON Info-package-type
                        *( COMMA Info-package-type )
 Info-package-type   =  Info-package-name *( "." Info-package-param)
 Info-package-name   =  token-nodot
 token-nodot         =  1*( alphanum / "-"  / "!" / "%" / "*"
                            / "_" / "+" / "`" / "'" / "~" ) ;rfc3265
 Info-package-param  =  generic-param  ;this doesn't work due to dot!







Info-package-type   = token *( SEMI Info-package-param )




Regards,
Jeroen


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From an implementation perspective, this is unnecessarily complex and verbose: if a UA can both send and receive the same INFO package, it must list it twice. As an alternative, I would propose something similar to SDP media streams: Supported-Info = "Supported-Info" HCOLON Info-package-type *(COMMA Info-package-type) Info-package-param = "sendonly" / "recvonly" / generic-param ; only one of "sendonly" or "recvonly" may be present Usage would be to include 1 "Supported-Info" header in requests/ responses, instead of 2 separate "Send-Info" / "Recv-Info". By default a package is "sendrecv" (i.e. UA may send it, and can receive it), unless overridden by "sendonly" or "recvonly" flags

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