[OpenSIPS-Users] drouting module with append_branch() and q-values

[Bogdan-Andrei Iancu]

Hi,

Another tricks:

1) you can read the pending destinations directly from AVPs, without 
calling the "use_next_gw()" function. See:
    http://www.opensips.org/html/docs/modules/1.6.x/drouting.html#id293166

2) as append_branch() does not accept variables as params, use the 
"$branch" variable to write into:
    http://www.opensips.org/Resources/DocsCoreVar16#toc15
    like:
       $branch = $var(x) ; #add a new SIP URI as extra branch
       $(branch(q)[-1])  =  10 ;  # set Q val for the last added brach


Regards,
Bogdan


Anca Vamanu wrote:
> Hi thrillerbe,
>
> I think that if you only want to build the list of selected 
> destinations, you can just call use_next_gw and add the uri in RURI to 
> a destination string ( because use_next_gw sets the RURI to the 
> destination- 
> http://www.opensips.org/html/docs/modules/devel/drouting.html#id251519).
> It would be something like this:
>
> if (do_routing("1","2")) 
> { 
>     if ($avp(s:dr_rules_attrs) == "2")
>     {
>         xlog("L_INFO","After 1, ds is $ru\n");  
>         $var(x) = 2;
>         $var(ds) = $ru;
>
>         while (use_next_gw())  
>         {  
>             $var(ds) = $var(ds) + "," + $ru;
>             xlog("L_INFO","After $var(x), ds is $var(ds)\n");   
>             $var(x) = $var(x) + 1;  
>         }  
>     }  
>     xlog("L_INFO","Destination set is $var(ds)\n"); 
> }
>
>
> Regards,
> -- 
> Anca Vamanu
> OpenSIPS Developer
>
>
> On 03/29/2011 01:00 AM, thrillerbee wrote:
>> I'm trying to get OpenSIPS to act as a REDIRECT server and have run 
>> into a couple issues. I'm using the drouting module to do lookups. 
>> Essentially, a dialed number could have potentially several routes, I 
>> want to return a 300 with these routes in the Contact header. Please 
>> tell me if this is foolish and/or there are better methods.
>>
>> I'm running release version 1.6.4-2-notls.
>>
>> With that, I've configured the following in my script:
>> if (do_routing("1","2")) 
>>     {  
>>     if ($avp(s:dr_rules_attrs) == "2")
>>     {
>>         xlog("L_INFO","After 1, ds is $ds\n");  
>>         $var(x) = 2;
>>         while (use_next_gw())  
>>         {  
>>             append_branch();
>>             xlog("L_INFO","After $var(x), ds is $ds\n");   
>>             $var(x) = $var(x) + 1;  
>>         }  
>>     }  
>>     xlog("L_INFO","Destination set is $ds\n"); 
>> }
>>
>> My relevant debug output is:
>> After 1, ds is Contact: sip:15552345678 at 1.1.1.1 
>> <mailto:sip%3A15552345678 at 1.1.1.1> 
>> After 2, ds is Contact: *sip:2215552345678 at 2.2.2.2 
>> <mailto:sip%3A2215552345678 at 2.2.2.2>, sip:2215552345678 at 2.2.2.2 
>> <mailto:sip%3A2215552345678 at 2.2.2.2>* 
>> After 3, ds is Contact: *sip:5552345678 at 3.3.3.3 
>> <mailto:sip%3A5552345678 at 3.3.3.3>*, sip:2215552345678 at 2.2.2.2 
>> <mailto:sip%3A2215552345678 at 2.2.2.2>, *sip:5552345678 at 3.3.3.3 
>> <mailto:sip%3A5552345678 at 3.3.3.3>* 
>> After 4, ds is Contact: *sip:15552345678 at 5.5.5.5 
>> <mailto:sip%3A15552345678 at 5.5.5.5>*, sip:2215552345678 at 2.2.2.2 
>> <mailto:sip%3A2215552345678 at 2.2.2.2>, sip:5552345678 at 3.3.3.3 
>> <mailto:sip%3A5552345678 at 3.3.3.3>, *sip:15552345678 at 5.5.5.5 
>> <mailto:sip%3A15552345678 at 5.5.5.5>* 
>> After 5, ds is Contact: *sip:4415552345678 at 4.4.4.4 
>> <mailto:sip%3A4415552345678 at 4.4.4.4>*, sip:2215552345678 at 2.2.2.2 
>> <mailto:sip%3A2215552345678 at 2.2.2.2>, sip:5552345678 at 3.3.3.3 
>> <mailto:sip%3A5552345678 at 3.3.3.3>, sip:15552345678 at 5.5.5.5 
>> <mailto:sip%3A15552345678 at 5.5.5.5>, *sip:4415552345678 at 4.4.4.4 
>> <mailto:sip%3A4415552345678 at 4.4.4.4>* 
>>
>> It seems that append_branch() deletes the first entry in the 
>> destination set before adding the current RURI to the beginning and 
>> end. Is there an easier or more predictable way to write to the 
>> destination set?
>>
>> Also, it seems the append_branch() function will not take variables 
>> or avps as parameters. Is there a known way of setting different 
>> q-values as a destination set is generated?  The below obviously 
>> doesn't work but should explain what I'm looking for:
>>
>> var(q) = 90;
>> while (use_next_branch())
>> {
>>     append_branch("$ru","$var(q)");
>>     $var(q) = $var(q) - 10;
>> }
>>
>> Thanks,
>> Ryan
>>
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-- 
Bogdan-Andrei Iancu
OpenSIPS eBootcamp - 2nd of May 2011
OpenSIPS solutions and "know-how"