[Freeswitch-users] SIP REFER - URI Parameters

[Anthony Minessale]

That's fine, submit it as a git diff to JIRA per our standard practice and
it will surely get added.



On Fri, Mar 7, 2014 at 9:23 AM, Phil Dunks <phil.dunks at netdev.co.uk> wrote:

>
> Hi Anthony
>
> I have not been able to get the URI params from the the REFER message
> (Refer-To header), copied into the request URI of the INVITE.
>
> However, I have solved my problem a different way.
>
> I have written the parameters to a custom header, and then modified the
> dial plan on the conference nodes to look there instead.
>
> I achieved this by adding the following code to sofia.c ::
> sofia_handle_sip_i_refer
>
>             if (refer_to->r_url->url_params) {
>                 switch_channel_set_variable(b_channel,
> "sip_h_X-FS-Refer-Params", refer_to->r_url->url_params);
>             }
>
> I put this at line 7702 (current master
> 09d66c7ae2c970f922226dfb72e66c0eb33c7d02), just before :
>
> switch_ivr_session_transfer(b_session, exten, NULL, NULL);
>
> Do you think this is an acceptable solution and would you consider
> committing it, or have you got a better idea?
>
> Thanks
>
> Phil
>
>
>
> Begin forwarded message:
>
> *From: *Phil Dunks <phil.dunks at netdev.co.uk>
> *Subject: **Re: SIP REFER - URI Parameters*
> *Date: *3 March 2014 12:53:55 GMT
> *To: *freeswitch-users at lists.freeswitch.org
>
> Hi Anthony.
>
> Thanks for looking at this and exposing the sip_refer_to_params variable.
>
> I’ve updated to head, and can see the change in sofia.c.
>
> Sorry for being dense, but I’ve not had much luck getting the uri params
> from the REFER to the INVITE.
>
> My dial plan is very simple.
>
> <include>
>  <extension name="public_did">
>   <condition field="destination_number" expression="(\d+)">
>     <action application="set" data="proxy_media=true"/>
>     <action application="bridge"
> data="sofia/gateway/${distributor(load-balance ${sofia(profile external
> gwlist down)})}/$1"/>
>    </condition>
>  </extension>
> </include>
>
> I tried appending ${sip_refer_to_params} to the bridge uri, but no luck.
>
> It seems the REFER is handled by sofia_handle_sip_i_refer in sofia.c
> which sets up a blind transfer.
>
> I’ve been staring at sofia.c all morning - but not worked out what I need
> to do.
>
> Please could you shed some light on how to proceed.
>
> Thanks again,
> Phil
>
>
> *From: *Anthony Minessale <anthony.minessale at gmail.com>
> *Subject: **Re: [Freeswitch-users] SIP REFER - URI Parameters*
> *Date: *28 February 2014 19:15:11 GMT
> *To: *FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
> *Reply-To: *FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
>
>
> Added a patch to expose sip_refer_to_params vars.  See latest HEAD.
>
>
> On Fri, Feb 28, 2014 at 11:17 AM, Phil Dunks <phil.dunks at netdev.co.uk>
>  wrote:
>
>> Hi Guys
>>
>> I’m trying to use FS (1.5.8b from last week) as an SBC and load-balancer
>> (using mod_distributor).
>>
>> It is load balancing between several FS conference nodes.
>>
>> It’s working a treat, apart from one scenario :
>>
>> Say conference xyz is already running on conf-node-1.
>>
>> Next incoming call is sent to conf-node-2, pin is collected, and
>> conference xyz is identified as the required conference.
>>
>> Conf-node-2 checks presence, and sees the conference is already running
>> on conf-node-1, and does a deflect.
>>
>> We add some query params to the refer-to URI to tell conf-node-1 not to
>> collect the pin, but put the caller straight into the conference.
>>
>> e.g <action application="deflect" data=“sip:1234 at 10.1.1.2;conf=xyz" />
>>
>> In the REFER I can see the params :
>>
>> Refer-To: <sip:1234 at 10.1.1.2;conf=xyz>
>>
>> But they are not present on the request URI or To header in the INVITE to
>> conf-node-1.
>>
>> So conf-node-1 requests the PIN again.
>>
>> Is there any way I can pass this info to the other conference node by
>> using the REFER?
>>
>> Thanks for your help.
>>
>> Phil
>>
>>
>
>
> *Phil Dunks*
>
> *Principal Engineer*
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-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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