Asterisk GUI (asterisknow) fake ring back

Hello,

Thanks very much for the great support contributors of this forum,

My problem is i installed a PRI E1 card successfully on asterisk now machine and working fine, only problem is the fake
ring back as there is no “r” in the dial extensions please let me know how to eliminate the fake ring back tone my asterisk version is 1.6.2

Thanks,
Sathish