MT 3.15 Radius CoA - PPTP problem?

Hello! When trying to dynamically change QoS Setting for my PPTP clinet by CoA Request (Mikrotik-Rate-Limit) :

Sending CoA-Request of id 72 to 10.10.10.x port 1700
        Service-Type = Framed-User
        User-Name = "login"
        Acct-Session-Id = "816002fd"
        Mikrotik-Rate-Limit = "32k/32k"
        NAS-IP-Address = 10.10.10.x
        NAS-Port = 777
        Service-Type = Framed-User
        Framed-Protocol = PPP
        Framed-IP-Address = 192.168.x.x
        Calling-Station-Id = "10.x.x.x"

I receive following:

rad_recv: CoA-NAK packet from host 10.10.10.x:1700, id=72, length=38
        Error-Cause = Unsupported-Extension
        NAS-Identifier = "id"
        NAS-IP-Address = 10.10.10.x

Mikrotik log shows:

13:03:14 hotspot,error,info,debug Radius  request for unknown ip 192.168.x.x

How can I solve my problem?

try this