When making an outbound PSTN call from CUPC softphone, when the call is ringing, I hear two ring tones, one generated locally from the CUPC client and one in the rtp stream from the PSTN gateway. Once the call is answered, the call connects OK.
In the lab deployment, I only hear the locally generated ring tone (even though by using a sniffer, I still see the rtp stream from PSTN gatway reaching the pc)
Getting the inernal ringtone is not a problem. but getting both is rather annoying. PSTN gateway in both cases is H323.