if you have p2ktools hook up your phone to it. click the "hidden settings" tab, and "alerts", get values and make sure the "continental alert" box is checked. Presto!! restart and in the audio settings should be the continental ringer you are looking for.
Here is a similar ringer, continental appears to be a hidden file. you can find it in p2ktools under alerts, but i cant find a way to copy it just yet.
Most of the default rings are turned on by seem edit:
SEEM 0032_0001
offset 05 - bit 3: Silent alert (ringtones) (1 on, 0 off)
offset 06 - bit 1: Siren alert (1 on, 0 off)
offset 38 - bit 1: Continental alert (1 on, 0 off)
bit 2: Classic alert (1 on, 0 off)
bit 3: Attention alert (1 on, 0 off)
offset 3B - bit 2: Vibe Dot alert (1 on, 0 off)
bit 3: Vibe Dash alert (1 on, 0 off)
bit 4: Vibe Dot Dot alert (1 on, 0 off)
bit 5: Vibe Dot Dash alert (1 on, 0 off)
bit 6: Vibe Pulse alert (1 on, 0 off)