I bought the bta1500 to work with gateway 500. I have a 2004 porshe cayenne with PCM 2.1 radio with Nav.

I don't have the Tel/Phone button. Can I still use this? Don't care so much about the phone capabilities, I really wanted to use it for the streaming features.

Is this possible?

 

It will probably work, I just installed mine on a 2005 911 and if I recall correctly the bluetooth can be setup without the phone button but don't hold me to it.
You can easily plug it in and try it without runnign the mic cable inside of the car if you just want to test it real quick.