User -> RAS PPP -> PortServer TS 8 -> RADIUS Problem

Hello!
Help, please with the following problem: There is device Digi PortServer TS 8. As a result authentification Dial-In users on RADIUS server TS 8 returns user a PPP CH Failure, though RADIUS server returns Accept.
192.168.3.4 - RADIUS server (Windows Server 2003 IAS)
192.168.3.240 - Digi PS 8

No. Time Source Destination Protocol Info
1 0.000000 192.168.3.240 192.168.3.4 RADIUS Access-Request(1) (id=12, l=94)

Frame 1 (136 bytes on wire, 136 bytes captured)
Ethernet II, Src: 192.168.3.240 (00:40:9d:29:8f:1b), Dst: 192.168.3.4 (00:0e:0c:4a:4f:5a)
Internet Protocol, Src: 192.168.3.240 (192.168.3.240), Dst: 192.168.3.4 (192.168.3.4)
User Datagram Protocol, Src Port: 1036 (1036), Dst Port: radius (1812)
Radius Protocol
Code: Access-Request (1)
Packet identifier: 0xc (12)
Length: 94
Authenticator: 00000000000000000000000000000000
Attribute Value Pairs
AVP: l=7 t=User-Name(1): test2
User-Name: test2
AVP: l=19 t=CHAP-Password(3): 017D6F89F3ADB32FD93776DAD11AFB3C97
AVP: l=18 t=CHAP-Challenge(60): D055224057E89263AE7E823A264CE62F
AVP: l=6 t=NAS-IP-Address(4): 192.168.3.240
AVP: l=6 t=NAS-Port(5): 2
AVP: l=6 t=Service-Type(6): Framed-User(2)
AVP: l=6 t=Framed-Protocol(7): PPP(1)
AVP: l=6 t=NAS-Port-Type(61): Async(0)

No. Time Source Destination Protocol Info
2 0.002357 192.168.3.4 192.168.3.240 RADIUS Access-Accept(2) (id=12, l=64)

Frame 2 (106 bytes on wire, 106 bytes captured)
Ethernet II, Src: 192.168.3.4 (00:0e:0c:4a:4f:5a), Dst: 192.168.3.240 (00:40:9d:29:8f:1b)
Internet Protocol, Src: 192.168.3.4 (192.168.3.4), Dst: 192.168.3.240 (192.168.3.240)
User Datagram Protocol, Src Port: radius (1812), Dst Port: 1036 (1036)
Radius Protocol
Code: Access-Accept (2)
Packet identifier: 0xc (12)
Length: 64
Authenticator: 6DFEEDEEA1A8D75C217391E209147129
Attribute Value Pairs
AVP: l=6 t=Framed-IP-Address(8): Negotiated
AVP: l=6 t=Port-Limit(62): 1
AVP: l=32 t=Class(25): 467B04BB000001370001C0A8030401C705767FCA344B0000…

Promt please, what comes short PS to connect user on PPP?
Best regards!
Andrew