Hi,
As per RFC-3261 section 19.1.1 "SIP and SIPS URI Components"
SIP URI is defined as:
sip:user:passw...@host:port;uri-parameters?headers
Headers: Header fields to be included in a request constructed
from the URI.
Headers fields in the SIP request can be specified with the "?"
mechanism within a URI. The header names and values are
encoded in ampersand separated hname = hvalue pairs. The
special hname "body" indicates that the associated hvalue is
the message-body of the SIP request.
e.g:
Refer-To:
<sip:[email protected]?replaces=xyz%40example.com%3bto-tag%3dabc123%3bfrom-tag%3dabc456>
Now, Replaces header will be placed in new INVITE request created by Refer-To
URI.
Regards,
Amit Sharma
ARICENT
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of jafer
sharif mohammed
Sent: Thursday, February 05, 2009 3:08 PM
To: [email protected]
Subject: [Sip-implementors] Escaped Header
Hi All,
Can anyone please clarify the below points:
1. Why always Escaped header should be preceded by question mark(?).
2. What is the significance of Escaped Header.
3. Is there any information on usage of Escaped Header.
4. Examples of Escaped headers.
5. What is the usage of Escaped header in SIP Application.
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