The way you have explained the use case would require the phones to do complex SIP operations. Phone C need to know the dialog identifiers (dialog info package probably would help)of the call between A and B and then use replaces header to "intercept the call". I presonally haven't seen phones doing this. If you want to send the initial call to both phone B and C, either in parallel or sequentally, then SER can easily do the job. Just read a few mails or the getting started document and you'll see how to do this. Hope it helps, Samuel. 2008/2/20, roayu <roayu(a)ctisys.net>et>: