E1 (DID / DOD link) - Holdover

Unanswered Question
Feb 6th, 2010
User Badges:

Could anyone help me regarding our VOIP..

We are experiencing unstable call connection in our gateway. We have E1 link (DID/ DOD) with 30 channels (17 Incoming & 13 Outgoing).

During the day will experience (4 to 5 times) call drop out, and once we check the gateway, show voice port summary (below is the output).

We need to SHUT and NO SHUT the channel-group interface to change the state to IDLE otherwise no incoming or outgoing calls.

busy-out status.JPG

********** Show version **************

BM28VG#sh ver
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(22)T1, RELEASE SOFTWARE (fc5)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Thu 26-Feb-09 19:47 by prod_rel_team

ROM: System Bootstrap, Version 12.4(1r) [hqluong 1r], RELEASE SOFTWARE (fc1)

BM28VG uptime is 1 hour, 35 minutes
System returned to ROM by reload at 13:49:32 GMT Sat Feb 6 2010
System restarted at 13:51:13 GMT Sat Feb 6 2010
System image file is "flash:c2800nm-advipservicesk9-mz.124-22.T1.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 you require further assistance please contact us by sending email to
[email protected] 2821 (revision 53.50) with 245760K/16384K bytes of memory.
Processor board ID FCZ104372H4
2 Gigabit Ethernet interfaces
1 Channelized/Clear E1/PRI port
1 Virtual Private Network (VPN) Module
8 Voice FXO interfaces
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)



Configuration register is 0x2102


********* Show run *********

no aaa new-model
clock timezone GMT 3
clock summer-time EDT recurring
network-clock-participate wic 0
network-clock-select 1 E1 0/0/0

controller E1 0/0/0
framing NO-CRC4
line-termination 75-ohm
ds0-group 0 timeslots 1-15,17-18 type r2-digital r2-compelled ani
ds0-group 1 timeslots 19-31 type r2-digital r2-compelled ani
cas-custom 0
  country saudiarabia use-defaults
cas-custom 1
  country saudiarabia use-defaults


*******Show Controller E1 0/0/0 ********

link up.JPG


****** Show Network-clocks*********************



We already open several Trouble ticket with our ISP but still there are insisting that the problem is our in-house wirings.

Currently we are using 25 pairs STP armored cable (60 to 70 meters long), and 3 meters CAT6 from patch to Router.

Our local cisco vendor already provided new Cisco 2800 for our gateway.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
paolo bevilacqua Sat, 02/06/2010 - 05:17
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

Send "show controllers E1". Do not user graphic images.

Note, ethernet cable has different pairing than E1. You MUST respect pairing hence using a special adapter cable.


This Discussion