I am getting a too short time before my Pre switches over to voicemail on Bell.

I am using an MP3 as a ringtone. Do the native Pre ring samples work better?

I did a test calling in and I heard two rings on the remote phone before the Pre started playing the MP3 ringtone, then only two more rings on the remote before the Pre kicked over to my Bell voicemail. I know the rings on the remote phone aren't always an accurate indication, but still, I have had multiple calls recently where I was diving for the phone just as the Pre's ringing stopped.