[Sip] Backward incompatibity in Via header grammar.

["Sachin Shenoy" <sachins@netlab.hcltech.com>]

Hi,

According to bis-02 & bis-05 the grammar of Via is following.

Via = ( "Via" | "v" ) HCOLON

1#( sent-protocol sent-by

*( SEMI via-params ) [ comment ] )

It allows for comment to be present in Via header.

 

But according to the new RFC, this is the grammar,

Via = ( "Via" / "v" ) HCOLON via-parm *(COMMA via-parm)

Which doesn't allow for comment.

 

Won't this cause backward incompatablity. (Any old proxy

which inserts comment in Via can cause serious problems for

new implementation).

 

Thanks

Sachin