[SR-Users] Setting Kamailio User-Agent dynamically

[Errol Samuels]

HI Daniel,

Thanks for that.

In my case I would need to use something like:

user_agent_header = "X-Proxy: $ua"

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
> 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>.
> From: <sip:1001 at pbx.mydomain.com
> >;tag=6f72f76f3402bf7cf11f6917529ca761-2ceb.
> CSeq: 10 REGISTER.
> Call-ID: 4570a277563cdffc-61869 at 184.xx.xx.208.
> Max-Forwards: 70.
> Content-Length: 0.
> .
> Contact: <sip:1001 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> 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 Mierlahttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
>
>
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