En utilisant [[http://yate.null.ro/docs/extmodule.html|extmodule]] et un socket:

    %%>connect:global
    %%>watch:call.update
    %%>message::0:call.update::oisup.NationalChargeUnitNumber=5:peerid=sig/7:id=sip/7:operation=charge:targetid=sig/7

Note: ``oisup`` est la valeur par défaut de ``message-oprefix``.

  #!/usr/bin/perl
  $|=1;
  use lib '/home/automate/Public/scripts';
  use Yate;
  use Data::Dumper;
  
  sub demo3($) {
    my $message = shift;
    $id = $message->param('id');
    $peerid = $message->param('peerid');
    $targetid = $message->param('targetid');
    $message->message("call.update",undef,$id,operation=>'charge','oisup.NationalChargeUnitNumber'=>5,id=>$id,peerid=>$peerid,targetid=>$targetid);
    return undef;
  }
  
  my $message = new Yate();
  $message->install("call.update",\&demo3);
  $message->listen();