obex and sony erricson ":8" doesnt work

i'm working on some project where i have to send obex messages to
various mobile devices...i'm using avetanabluetooth obex package,
anyways i have no problem sending obex messages to Nokia, but when i
try to send anything to obex enabeled sony erricson devices i get an
exception.

to connect to a device i use this address for connecting

String adr="btgoep://"+remotebt.getBluetoothAddress()+":8";

i think the problem is with the :8 part, maybe sony erricson registers
obex with another number or something please help.