[SR-Users] Routing calls to a subscribed softphone

[Will Ferrer]

Hi Paul

I think we have our nat stuff working on the kamailio server. The problem
now for me seems to be that I have a restrictive nat going on my home
network which is preventing me from receiving calls.

I am going to do some research on changing up my network here for testing.

Thanks again for all the great help.

I hope you have a wonderful weekend.

Will

On Fri, Oct 3, 2014 at 12:31 AM, Paul Smith <paul.smith at claritytele.com>
wrote:

>  Great stuff.
>
> NAT is a whole other basket of pain.  Again the example configs in the
> kamailio distribution are a good place to start... in particular the
> NATDETECT and NATMANAGE routines, and the nathelper and rtpproxy module
> usage.
>
> good luck
>
>
>  Hi Paul
>
>  Just wanted to give you an update.
>
>  This looks like it has worked. Now I am dealing with my own natting
> issues on my home network to get the call but the invites are being sent
> right now.
>
>  Thanks again for the assistance.
>
> All the best.
>
>  Will Ferrer
>
> On Wed, Oct 1, 2014 at 11:53 PM, Paul Smith <paul.smith at claritytele.com>
> wrote:
>
>>  Hi Will,
>> It sounds like your kamailio.cfg is not looking up the user location
>> database before trying to relay the INVITE.  There is a relevant section in
>> the kamailio-basic.cfg example configuration file:
>>
>>
>>
>> request_route {
>> 	...
>>
>>         # user location service
>>         route(LOCATION);
>> }
>>
>> ...
>>
>> # USER location service
>> route[LOCATION] {
>>         if (!lookup("location")) {
>>                 $var(rc) = $rc;
>>                 t_newtran();
>>                 switch ($var(rc)) {
>>                         case -1:
>>                         case -3:
>>                                 send_reply("404", "Not Found");
>>                                 exit;
>>                         case -2:
>>                                 send_reply("405", "Method Not Allowed");
>>                                 exit;
>>                 }
>>         }
>>
>>         # when routing via usrloc, log the missed calls also
>>         if (is_method("INVITE")) {
>>                 setflag(FLT_ACCMISSED);
>>         }
>>
>>         route(RELAY);
>>         exit;
>> }
>>
>>
>>
>>  The logic is that if the call is for a local registered user whose
>> location is available in the "kamctl ul"  then request_route() should pass
>> the request to the route(LOCATION) routine.  The function call
>> lookup("location") then does the magic if matching the address of record
>> ([subscriber_name]@[our_domain_name]) and returning the $ruri of the
>> registered phone ([realid]@[realip]).  route(RELAY) is then able to send
>> the call on to the phone's actual IP address.
>>
>> Hope that helps.
>>
>> Paul Smith
>>
>> On 02/10/14 03:33, Will Ferrer wrote:
>>
>>  Hi
>>
>>  I was wondering if any one had any advice or examples for me of how to
>> get a call to be routed to a subscribed softphone.
>>
>>  We have 2 boxes in our testing deployment, a load balancer / sbc and a
>> call processing box.
>>
>>  Calls come in to the sbc, and then are passed to the call processing
>> box. The call is analyzed and the branch uri is rewritten to a destination
>> address when applicable for the call (this is how we handle routing of
>> calls to certain numbers -- we do this utilizing custom code and a custom
>> db).
>>
>>  This works just fine when the destination sip uri is phone number (in
>> which case we do lcr) or if the destination goes to a remote address.
>>
>>  However when the destination is a subscriber:
>> sip:[subscriber_name]@[our_domain_name], the call is passed back to the
>> sbc, which passes it to the callprocessing box, back and forth until a too
>> many hops error occurs.
>>
>>  The subscriber I am trying to send the call too does show up under
>> "kamctl ul show".
>>
>>  I feel like there is something basic I must be missing here.
>>
>>  Does any one have any advice for me?
>>
>>  Thank you very much in advance.
>>
>>  All the best.
>>
>>  Will Ferrer
>>
>>
>>
>>  _______________________________________________
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>>
>>
>>
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>
>
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