info-event: syntax simplification
Jeroen van Bemmel <[email protected]>
| Newsgroups | gmane.ietf.sip |
|---|---|
| Message-ID | <[email protected]> |
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!
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-type = token *( SEMI Info-package-param )
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
Regards,
Jeroen
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