[SR-Users] Setting Kamailio User-Agent dynamically

[Daniel-Constantin Mierla]

Hello,

On 09/10/14 13:19, Errol Samuels wrote:
> HI Daniel,
>
> Thanks for that.
>
> In my case I would need to use something like:
>
> user_agent_header = "X-Proxy: $ua"
The only purpose of the above line is that Kamailio doesn't add an 
User-Agent header by itself, but this X-Proxy (which you can change as 
well).

Then you still add User-Agent in $uac_req(hdrs), but you don't end up 
with two User-Agent headers anymore.

Hope is more clear now the purpose of X-Proxy header.

Cheers,
Daniel

>
> since we don't what to hardcode a specific value which would affect 
> every device that is registering but rather $ua which would set the 
> real UA of the device that is registering at that time.
>
> Does that make sense?
>
> regards,
>
> Errol
>
>
> On Thu, Oct 9, 2014 at 12:09 PM, Daniel-Constantin Mierla 
> <miconda at gmail.com <mailto:miconda at gmail.com>> wrote:
>
>
>     On 08/10/14 19:25, Errol Samuels wrote:
>>     I followed Daniel's instructions and made some progress but not
>>     100% there yet.
>>
>>     -------[Global section]----------
>>
>>     user_agent_header=""
>>
>>     -------[Main Routing Logic]-------
>>
>>     # handle registrations
>>             if (is_method("REGISTER"))
>>             {
>>             $avp(new_user_agent) = $ua;
>>             }
>>             route(REGISTRAR);
>>     .
>>     .
>>
>>     # Forward REGISTER to Freeswitch
>>     route[REGFWD] {
>>
>>             if(!is_method("REGISTER"))
>>             {
>>                     return;
>>             }
>>             route(DISPATCH);
>>             $uac_req(method)="REGISTER";
>>             $uac_req(ruri)=$du;
>>             $uac_req(furi)=$fn + "<sip:" + $au + "@" + $ar + ">";
>>             $uac_req(turi)=$tn + "<sip:" + $au + "@" + $ar + ">";
>>             $uac_req(hdrs)="Contact: <sip:" + $au + "@"
>>                                     + $ar
>>                                     + ";fs_path=sip:"
>>                                     + $sel(cfg_get.kamailio.bindip)
>>                                     + ":" +
>>     $sel(cfg_get.kamailio.bindport)
>>                                     + ">"
>>                                     + "\r\n";
>>             if($sel(contact.expires) != $null)
>>                     $uac_req(hdrs)= $uac_req(hdrs) + "Expires: " +
>>     $sel(contact.expires) + "\r\n";
>>             else
>>                     $uac_req(hdrs)= $uac_req(hdrs) + "Expires: " +
>>     $hdr(Expires) + "\r\n";
>>             $uac_req(hdrs)= $uac_req(hdrs) + "User-Agent: " +
>>     $avp(new_user_agent) + "\r\n";
>>             uac_req_send();
>>             exit;
>>     }
>>     #!endif
>>
>>     ------------
>>
>>     Now the correct User-Agent appears in the REGISTER message but in
>>     Freeswitch it shows as unknown.
>>
>>     U 184.xx.xx.208:5060 -> 184.xx.xx.198:6060
>>     REGISTER sip:184.x.x.198:6060 SIP/2.0.
>>     Via: SIP/2.0/UDP 184.xx.xx.208;branch=z9hG4bKa764.668d6dc7.0.
>>     To: <sip:1001 at pbx.mydomain.com <mailto:sip%3A1001 at pbx.mydomain.com>>.
>>     From: <sip:1001 at pbx.mydomain.com
>>     <mailto:sip%3A1001 at pbx.mydomain.com>>;tag=6f72f76f3402bf7cf11f6917529ca761-2ceb.
>>     CSeq: 10 REGISTER.
>>     Call-ID: 4570a277563cdffc-61869 at 184.xx.xx.208
>>     <mailto:4570a277563cdffc-61869 at 184.xx.xx.208>.
>>     Max-Forwards: 70.
>>     Content-Length: 0.
>>     .
>>     Contact: <sip:1001 at pbx.mydomain.com
>>     <mailto:sip%3A1001 at pbx.mydomain.com>;fs_path=sip:184.xx.xx.208:5060>.
>>     Expires: 120.
>>     User-Agent: Yealink SIP-T46G 28.72.0.26.
>>     .
>>     ----------------
>>
>>     Got some extra dots in there but not sure why they are there and
>>     how they got there.
>>     Any ideas? Anything I missed?
>
>     Apparently by setting an empty user-agent header value in kamailio
>     config file results in an empty line in headers, which means end
>     of headers. So it kind of breaks the headers -- I will fix that in
>     kamailio.
>
>     A solution for now will be to use:
>
>     user_agent_header = "X-Proxy: abc"
>
>     Or, in other words, set the value of the parameter to something
>     that doesn't include User-Agent: as header name.
>
>     Cheers,
>     Daniel
>
>>
>>     BR
>>
>>     Errol
>>
>>
>>
>>     On Wed, Oct 8, 2014 at 12:34 PM, Daniel-Constantin Mierla
>>     <miconda at gmail.com <mailto:miconda at gmail.com>> wrote:
>>
>>         Perhaps you can get it with adding User-Agent header to
>>         $uac_req(hdrs):
>>
>>         $uac_req(hdrs)= $uac_req(hdrs) + "User-Agent: " + $ua + "\r\n";
>>
>>         And sent the global parameter:
>>
>>         user_agent_header=""
>>
>>         But then no local generated request has user agent, which
>>         probably is ok for you.
>>
>>         There are still ways to use event_route[tm:local-request] to
>>         set a custom user agent header, but would require something like:
>>         - add $us in $uac_req(hdrs) as X-UA header
>>         - in event_route[tm:local-request], remove User-Agent and
>>         X-UA headers and add again User-Agent taking the value from X-UA
>>
>>         Cheers,
>>         Daniel
>>
>>
>>
>>
>>
>
>     -- 
>     Daniel-Constantin Mierla
>     http://twitter.com/#!/miconda  <http://twitter.com/#%21/miconda>  -http://www.linkedin.com/in/miconda
>
>

-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda

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