[asterisk-users] Capture "Server" header in SIP reply.

[Chris Maciejewski]

"User-Agent" header is present in SIP *request* i.e. "INVITE" received
by Asterisk from UAC.

RFC 3261 - 20.41 User-Agent

   The User-Agent header field contains information about the UAC
   originating the request.  The semantics of this header field are
   defined in [H14.43].

   Revealing the specific software version of the user agent might allow
   the user agent to become more vulnerable to attacks against software
   that is known to contain security holes.  Implementers SHOULD make
   the User-Agent header field a configurable option.

   Example:

      User-Agent: Softphone Beta1.5


"Server" header is present in SIP *response* i.e. "200 OK" generated
by UAS to "INVITE" generated by Asterisk.

RFC 3261 - 20.35 Server

   The Server header field contains information about the software used
   by the UAS to handle the request.

   Revealing the specific software version of the server might allow the
   server to become more vulnerable to attacks against software that is
   known to contain security holes.  Implementers SHOULD make the Server
   header field a configurable option.

   Example:

      Server: HomeServer v2


My scenario:

Phone 1 ----- INVITE [1] -----> Asterisk ------> INVITE [2] ------> Phone 2
                                                        <------- 200
OK [3] -------

What I want to do is capture "Server" header in "200 OK" reply
generated by Phone 2.


2009/5/17 David Backeberg <dbackeberg at gmail.com>:
> On Sun, May 17, 2009 at 9:04 AM, Chris Maciejewski <chris at wima.co.uk> wrote:
>
> Maybe you need a better name for it than server. To me server means
> the hostname / address of the other side of the SIP conversation, aka:
> FROM.
>
> You can use SipAddHeader to make your own X-blah tags for your
> packets, and then pick them off on the other side. I don't seem to
> understand what you mean by 'server', despite my command of the
> english language. Perhaps you want
> ${SIPUSERAGENT}
>