Why does my Nokia ring when it connects to my handsfree device?

My Nokia 6650 mobile phone and my Jabra SP700 Bluetooth hands-free speakerphone work OK together – except for one thing. When they connect, my ringtone plays through the device – twice. This is after the device tells me it’s connected, and it’s not a standard feature, because my other phones didn’t do this. I can’t find anything about this in either manual, nor in any settings menu.

Other info:

Phone’s from AT&T; my tone is an mp3 of an old Western Electric.

Correction: sometimes it rings three times.

C’mon, somebody?