How to prolong ringtone on 7520

[WhyNot36]

Hi.

When I get a phone call on my new-to-me 7520, I can never get to it in time. It rings about twice and then goes to voicemail.

I tried to change it to the longest musical ringtone I could find, but it cuts the music off in the middle and goes to voicemail.

Any suggestions how I can regulate the length of the ring?

Thanks.