[cisco-voip] Slip Secs for Voice T1 of Cisco 2801 ISR ?

[Yunming Song]

Hello Group,

We installed CallManager 3.3(4) and Voice Gateway 2801,
inbound and outbound DID calls are fine, but we continuously receive
the increasing 'Slip Secs' errors by using "show controllers T1 0/1/0".

Check around Cisco solution, it is basically time synchronous issue,
worked with Verizon (PSTN Provider), they said that their side is
fine, no error happens.

Could somebody help me look at the configuration file (see attached)?
Your idea and advice is pretty much appreciated.

thanks,
Yunming Song
Digicon Corporation
571-323-5030
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vg-headquarters#sh ver
Cisco IOS Software, 2801 Software (C2801-SPSERVICESK9-M), Version 12.3(8)T4, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2004 by Cisco Systems, Inc.
Compiled Fri 03-Sep-04 00:01 by eaarmas

ROM: System Bootstrap, Version 12.3(8r)T8, RELEASE SOFTWARE (fc1)

vg-headquarters uptime is 6 days, 20 hours, 7 minutes
System returned to ROM by reload at 23:26:06 UTC Mon Nov 8 2004
System image file is "flash:c2801-spservicesk9-mz.123-8.T4.bin"


This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
 http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export at cisco.com.

cisco 2801 (revision 4.1) with 118784K/12288K bytes of memory.
Processor board ID FHK084020WU
2 FastEthernet interfaces
25 Serial interfaces
1 Channelized T1/PRI port
4 Voice FXO interfaces
2 DSPs, 32 Voice resources
WIC T1-DSU
DRAM configuration is 64 bits wide with parity disabled.
191K bytes of NVRAM.
62592K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102



vg-headquarters#sh run
Building configuration...

Current configuration : 1977 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname vg-headquarters
!
boot-start-marker
boot-end-marker
!
logging buffered 51200 warnings
enable secret 5 $1$PtV3$VPQ3SrSCRTX9UznIPAtIZ/
enable password 7 0215114B0E14022042
!
network-clock-participate wic 1 
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
 ip subnet-zero
ip cef
!
!
!
!
no ip domain lookup
ip host eastern 172.18.69.1
no ftp-server write-enable
isdn switch-type primary-5ess
!
voice-card 0
!
!
!
!
!
!
!
!
!
!
!
!
!
 !
!
!
controller T1 0/1/0
 framing esf
 linecode b8zs
 cablelength short 133
 pri-group timeslots 1-24
!
!
!
interface FastEthernet0/0
 description fastethernet to 6509B
 ip address 172.16.200.251 255.255.255.0
 speed auto
 full-duplex
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
 interface Serial0/1/0:23
 no ip address
 isdn switch-type primary-5ess
 isdn incoming-voice voice
 no cdp enable
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.200.254
!
ip http server
ip http authentication local
ip http secure-server
!
!
!
!
!
control-plane
!
 !
!
voice-port 0/1/0:23
!
!
!
!
!
dial-peer voice 1 voip
 destination-pattern [1-8]T
 progress_ind setup enable 3
 session target ipv4:172.16.200.1
 dtmf-relay h245-alphanumeric
  no vad
!
dial-peer voice 10 pots
 destination-pattern 9T
 direct-inward-dial
 port 0/1/0:23
!
dial-peer voice 11 pots
 destination-pattern [1-8]....
 direct-inward-dial
 port 0/1/0:23
!
!
line con 0
 password 7 04481E160A33414F07
 login local
line aux 0
line vty 0 4
 password 7 0518131F245E430817
 login
 transport input telnet ssh
line vty 5 15
 password 7 0832595E0C0B08161C
 login
  transport input telnet ssh
!
end