I doubt many will contain substantial code, but the added flexibility and modularity is justification enough in my opinion. Maybe some will be a better fit than others. So unless anyone else thinks differently, I'll go ahead with the first and see how it works. Best, Charles On 16 September 2013 10:06, Daniel-Constantin Mierla &lt;miconda(a)gmail.com&gt;wrote;wrote: -- www.sipcentric.com Follow us on twitter @sipcentric <http://twitter.com/sipcentric> Sipcentric Ltd. Company registered in England & Wales no. 7365592. Registered office: Unit 10 iBIC, Birmingham Science Park, Holt Court South, Birmingham B7 4EJ.