Solved

VOIP QOS over T1's

Posted on 2008-06-20
4
1,171 Views
Last Modified: 2008-07-01
Hey Experts, I need a quick tutorial on how to setup QOS for VOIP Packets.  When my router gets busy some of my T1 clients are experiencingbetter than perfect voice quality.  I just need to know how to prioritize the VOIP Packets.  If I need to upgrade my IOS please let me knowwhere to get it.  TIA

7206#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-IS-M), Version 12.1(9), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2001 by cisco Systems, Inc.
Compiled Wed 13-Jun-01 16:53 by kellythw
Image text-base: 0x60008950, data-base: 0x61510000

ROM: System Bootstrap, Version 12.0(19990210:195103) [12.0XE 105], DEVELOPMENT SOFTWARE
BOOTLDR: 7200 Software (C7200-BOOT-M), Version 12.0(10)S, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

7206 uptime is 2 weeks, 5 days, 33 minutes
System returned to ROM by power-on
System image file is "slot0:c7200-is-mz.121-9.bin"

cisco 7206VXR (NPE300) processor (revision B) with 122880K/40960K bytes of memory.
Processor board ID 23659150
R7000 CPU at 262Mhz, Implementation 39, Rev 1.0, 256KB L2, 2048KB L3 Cache
6 slot VXR midplane, Version 2.1

Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.
4 Ethernet/IEEE 802.3 interface(s)
3 FastEthernet/IEEE 802.3 interface(s)
22 Serial network interface(s)
1 Channelized T3 port(s)
125K bytes of non-volatile configuration memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
4096K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2102
0
Comment
Question by:hgallagher
  • 3
4 Comments
 
LVL 28

Expert Comment

by:Jan Springer
Comment Utility
Configure class-map[s], policy-map[s] and apply the policy to the interface.

The remote end of the T1 will require a similar configuration.  If is does not prioritize your voice at the remote end, there is no point in you configuring it locally.

Let me know if you need an example.

I would recommend upgrading the IOS before configuring policing.  Are you using CEF?
0
 

Author Comment

by:hgallagher
Comment Utility
Two things, An example would be tremendous, also how to implement CEF would be also worth the points.  TIA.
0
 
LVL 28

Accepted Solution

by:
Jan Springer earned 500 total points
Comment Utility
2nd part first:

config t
 ip cef
 end

check that the interfaces have cef turned on -> sh ip cef

i'll pull together a QoS example.
0
 
LVL 28

Expert Comment

by:Jan Springer
Comment Utility
Adjust as needed:

ip access-list extended SIP
  permit udp any any eq 5060

class-map match-all VoIP
   match access-group name SIP
class-map match-all RTCP
   match ip rtp 16384 16383
class-map match-any VoIP-DSCP
   match ip dscp ef
   match ip dscp cs3
   match ip dscp af31

policy-map Set-DSCP
 class RTCP
   set ip dscp ef
 class VoIP
   set ip dscp af31
 class VoIP-DSCP
   set ip dscp default

policy-map QoS-Policy
  class RTCP
   bandwidth percent 20
  class VoIP
    bandwidth percent 5
  class class-default
    fair-queue
     set ip dscp default

interface Serial<whatever>
  service-policy input Set-DSCP
  service-policy output Qos-Policy
0

Featured Post

Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

Join & Write a Comment

Suggested Solutions

There are two basic ways to configure a static route for Cisco IOS devices. I've written this article to highlight a case study comparing the configuration of a static route using the next-hop IP and the configuration of a static route using an outg…
Shadow IT is coming out of the shadows as more businesses are choosing cloud-based applications. It is now a multi-cloud world for most organizations. Simultaneously, most businesses have yet to consolidate with one cloud provider or define an offic…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now