Hi,
which Kamailio version are you using?
Dispatcher's algorithm 12 is available in master/5.1-dev. 
The default behaviour of the module is to pick the first destination in the set if the selected algorithm is unknown: http://www.kamailio.org/docs/modules/5.0.x/modules/dispatcher.html#dispatcher.f.ds_select_dst.

Regards,

Federico

On 2 Dec 2017 21:28, "George Diamantopoulos" <georgediam@gmail.com> wrote:
Hello all,

I've been trying to use dispatcher's algorithm "12" to fork REGISTER messages constructed with uac module to all destinations within a set.

However, the request is routed to only one destination. Is anything else needed in addition to calling ds_select_dst("0", "12") in the configuration script? Thanks.

BR,
George

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