Hi Suman,
Via: \r\n
SIP/2.0 \r\n
/[transport]
[local_ip]:[local_port];branch=[branch]\r\n
The above message is incorrect because \r\n denotes the end of header value and
in new line it will not find Header Name.
The below value is correct
Via: SIP/2.0 [transport] [local_ip]:[local_port];branch=[branch]\r\n
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Sumant
Gupta
Sent: Monday, April 15, 2013 11:04 AM
To: [email protected]
Subject: [Sip-implementors] Query regarding ABNF syntax for SIP message headers
Hi All,
I have a query regarding the parsing of sip message headers.I am taking the
example of via header.
Is the below message correct or not?
Via: \r\n
SIP/2.0 \r\n
/[transport]
[local_ip]:[local_port];branch=[branch]\r\n
As per grammer and my understanding:
Via = ( "Via" / "v" ) HCOLON via-parm *(COMMA via-parm) via-parm =
sent-protocol LWS sent-by *( SEMI via-params ) sent-protocol = protocol-name
SLASH protocol-versionSLASH transport
Now the via-parm expands to following value after populating the value of
"sent-protocol"
via-parm = protocol-name SLASH protocol-version SLASH transport LWS sent-by *(
SEMI via-params )
Now the HCOLON refers to:
HCOLON = *( SP / HTAB ) ":" SWS
SWS refers to following value:
SWS = [LWS] ; sep whitespace
LWS refers to:
LWS = [*WSP CRLF] 1*WSP ; linear whitespace
>From the above syntax it seems that CRLF is possible in the above
syntax of Via message header after the ":".
Is my understanding correct or is there some error in understanding the ABNF
grammer ?
Looking forward for response.
Regards
Sumant
_______________________________________________
Sip-implementors mailing list
[email protected]
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
===============================================================================
Please refer to http://www.aricent.com/legal/email_disclaimer.html
for important disclosures regarding this electronic communication.
===============================================================================
_______________________________________________
Sip-implementors mailing list
[email protected]
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
