[Users] Parallel ringing

[Andreas M.]

Hello,
how could it be done through AVP´s and database lookup, to do a parallel 
ringing.

Following setup:
If uri eg example at test.dom is called, this call should be forwarded in 
parallel to a pstn-gateway.

That means, receive the AVP with the telephonnumber associated to uri 
example at test.dom, rewrite uri, rewrite host/port and forward in parallel 
to gateway.

I tried "append_branch", but was not able to put in the AVP 
(phonenumber), rewrite host/port points directly to the gateway.
I have no troubles to load the AVP, only to make is possible, that the 
SIP Client and PSTN Phone are ringing in parallel.

Some suggestions ?

regards,
Andreas