RightFax H323 -> SIP

I had to migration RightFax from the H323 into SIP and spent some time on this. The procedure is pretty strength forward, but one thing is good to know: changed the Media Renegotiate Delay Outbound from -1, which means Rightfax does not initiate T.38 but waits for the other side to initiate it, to 2000 which means that Rightfax initiates T.38...