>А конфиг глянуть можно?

спасибо за ответ, думал уже никто не отзовется:) Конфиг ниже
Сам думаю завтра попробовать вытащить из 1751 модуль Е1 и воткнуть а аналогичную,
вдруг проблема с PVDM модулями.

memory-size iomem 15
clock timezone YEKST 5
clock summer-time YEKST recurring last Sun Mar 3:00 last Sun Oct 3:00
tdm clock E1 0/0 both import onboard internal
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
voice-card 0
no aaa new-model
ip subnet-zero
ip cef
!
no ip domain lookup
isdn switch-type primary-net5

voice service voip
!
voice class codec 1
codec preference 1 g711alaw
codec preference 2 g711ulaw
codec preference 3 g726r32
codec preference 4 g729r8

controller E1 0/0
pri-group timeslots 1-10,16
!
!
!
interface FastEthernet0/0
ip address 192.168.100.6 255.255.255.0
speed auto
!
interface Serial0/0:15
no ip address
encapsulation hdlc
no logging event link-status
isdn switch-type primary-net5
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.100.1
no ip http server
!
no cdp run

dial-peer voice 99999 pots
destination-pattern 65130[0-9]
direct-inward-dial
port 0/0:15
forward-digits all
!
dial-peer voice 1 voip
description to c_1751_e1_main on Kujbisheva 35
destination-pattern .T
voice-class codec 1
session target ipv4:192.168.100.2
ip qos dscp cs5 media
ip qos dscp cs3 signaling
no vad
!

ну и за компанию
c_1751_e1#show isdn status
Global ISDN Switchtype = primary-net5
ISDN Serial0/0:15 interface
        ******* Network side configuration *******
        dsl 0, interface ISDN Switchtype = primary-net5
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Active dsl 0 CCBs = 0
    The Free Channel Mask:  0x800003FF
    Number of L2 Discards = 0, L2 Session ID = 1
    Total Allocated ISDN CCBs = 0