[c-nsp] NAS-Port attribute on C3825-IPVOICEK9-M

[Tseveendorj]

Hello,

I'm trying to configure simultaneous-use on my RAS. I'm using following

FreeRADIUS 2.1.8
Cisco 3825  Version 12.4(15)T9, RELEASE SOFTWARE (fc5)

The problem is NAS-Port is always zero. I've configured radius-server 
attribute nas-port format b and d but all users port is zero or ten.  
You can see the accounting record below.

Acct-Session-Id = "0002ED57"
         Cisco-AVPair = "client-mac-address=0030.4f6d.d458"
         Framed-Protocol = PPP
         User-Name = "eberx"
         Cisco-AVPair = "connect-progress=Call Up"
         Acct-Authentic = RADIUS
         Acct-Status-Type = Start
         NAS-Port-Type = Virtual
         NAS-Port = 0
         NAS-Port-Id = "0/0/0/10"
         Service-Type = Framed-User
         NAS-IP-Address = 192.168.2.1
         X-Ascend-Session-Svr-Key = "D234512C"
         Acct-Delay-Time = 0
         Acct-Unique-Session-Id = "0233356563bade86"
         Timestamp = 1300703966
         Request-Authenticator = Verified

The question is

Is this software which I'm using does not work properly or does not 
support ?
What I need to do ?

regards,
Tseveen.