Hello Christoph,
Kamailio is providing a lot of different functions. Some of these functions
could be used to implement a network element with features which are forbidden
in the RFC 3261 and/or other relevant RFCs.
One of the most prominent examples is e.g., rewriting of From and To headers.
It is in the end the responsibility of the implementing person to ensure that
the relevant standards in the specific environments are observed.
Cheers,
Henning
From: Valentin Christoph via sr-users <sr-users@lists.kamailio.org>
Sent: Mittwoch, 6. März 2024 12:20
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Cc: Onic Roman <roman.o...@kontron.com>; Scherney Theodor
<theodor.scher...@kontron.com>; Friedrich Peter <peter.friedr...@kontron.com>;
Wolfgang Gleinser <wolfgang.glein...@kontron.com>; Valentin Christoph
<christoph.valen...@kontron.com>
Subject: [SR-Users] Question for RFC junkies / kamailio modifying message bodies
Hi all,
it might be a minor issue, or it might not be an issue at all, but I stumbled
over following statements in RFC 3261:
Chapter 16.6 Request Forwarding (of a proxy)
1. Copy request
The proxy starts with a copy of the received request. The copy
MUST initially contain all of the header fields from the
received request. Fields not detailed in the processing
described below MUST NOT be removed. The copy SHOULD maintain
the ordering of the header fields as in the received request.
The proxy MUST NOT reorder field values with a common field
name (See Section
7.3.1<https://www.rfc-editor.org/rfc/rfc3261.html#section-7.3.1>). The proxy
MUST NOT add to, modify,
or remove the message body.
An actual implementation need not perform a copy; the primary
requirement is that the processing for each next hop begin with
the same request.
Chapter 16.7 Response Processing (at a proxy)
9. Forward response
After performing the processing described in steps "Aggregate
Authorization Header Field Values" through "Record-Route", the
proxy MAY perform any feature specific manipulations on the
selected response. The proxy MUST NOT add to, modify, or
remove the message body. Unless otherwise specified, the proxy
MUST NOT remove any header field values other than the Via
header field value discussed in Section
16.7<https://www.rfc-editor.org/rfc/rfc3261.html#section-16.7> Item 3. In
particular, the proxy MUST NOT remove any "received" parameter
On the other hand, everywhere in the Internet (starting with stackoverflow),
you can read it is OK, if a SIP proxy modifies a body, and also kamailio allows
it.
Might be a question for the coffee break.
All the best
Christoph
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
To unsubscribe send an email to sr-users-le...@lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to the
sender!
Edit mailing list options or unsubscribe:
