09-08-2008 05:36 AM - last edited on 03-25-2019 04:02 PM by ciscomoderator
Greetings, attached is a simplified diagram of our network. The issue im having is increased jitter on voice calls when both data and voice is traversing our leased line. When no data is passing jitter is reduced by approx 70%
Ive applied auto qos to both the fast ethernet interface on the Cisco 2811 running CME 4.3 and the serial wic on the 1841. No policies have been configured on the firewall.
What im looking for is really a confirmation that i have applied qos on the correct interfaces, any recommendation for additional configuration would be appreciated.
Regards
09-08-2008 05:55 AM
can u post qos config for each device
09-08-2008 08:04 AM
Cisco CME
policy-map AutoQoS-Policy-UnTrust
class AutoQoS-VoIP-RTP-UnTrust
priority percent 70
set dscp ef
class AutoQoS-VoIP-Control-UnTrust
bandwidth percent 5
set dscp af31
class AutoQoS-VoIP-Remark
set dscp default
class class-default
fair-queue
!
interface Loopback0
description Loopback For UnityExpress
ip address 10.10.10.2 255.255.255.252
!
interface FastEthernet0/0
description Voice
ip address 172.28.255.4 255.255.255.0
duplex full
speed 100
auto qos voip
service-policy output AutoQoS-Policy-UnTrust
!
interface FastEthernet0/1
description Access
ip address 172.29.255.4 255.255.255.0
duplex full
speed 100
!
ip access-list extended AutoQoS-VoIP-Control
permit tcp any any eq 1720
permit tcp any any range 11000 11999
permit udp any any eq 2427
permit tcp any any eq 2428
permit tcp any any range 2000 2002
permit udp any any eq 1719
permit udp any any eq 5060
ip access-list extended AutoQoS-VoIP-RTCP
permit udp any any range 16384 32767
!
Cisco 1841
class-map match-any AutoQoS-VoIP-Remark
match ip dscp ef
match ip dscp cs3
match ip dscp af31
class-map match-any AutoQoS-VoIP-Control-UnTrust
match access-group name AutoQoS-VoIP-Control
class-map match-any AutoQoS-VoIP-RTP-UnTrust
match protocol rtp audio
match access-group name AutoQoS-VoIP-RTCP
!
policy-map AutoQoS-Policy-UnTrust
class AutoQoS-VoIP-RTP-UnTrust
priority percent 70
set dscp ef
class AutoQoS-VoIP-Control-UnTrust
bandwidth percent 5
set dscp af31
class AutoQoS-VoIP-Remark
set dscp default
class class-default
fair-queue
!
ip access-list extended AutoQoS-VoIP-Control
permit tcp any any eq 1720
permit tcp any any range 11000 11999
permit udp any any eq 2427
permit tcp any any eq 2428
permit tcp any any range 2000 2002
permit udp any any eq 1719
permit udp any any eq 5060
ip access-list extended AutoQoS-VoIP-RTCP
permit udp any any range 16384 32767
!
interface Serial0/0/0
bandwidth 2048
ip unnumbered FastEthernet0/0
no ip redirects
no ip unreachables
no ip proxy-arp
encapsulation ppp
no ip mroute-cache
no cdp enable
service-policy output AutoQoS-Policy-UnTrust
I was considering putting a priority queue on the firewall to see if it made a difference.
Regards
09-08-2008 10:23 AM
Which way is having the quality problem? IP side or PSTN side? or both?
09-09-2008 01:38 AM
The quality problem occurs on the return RTP stream, there have been issues where by the called party can here the calling party but not the other way arround, during these cases jitter jumps to approx 3000ms.
We use SIP for voice services provided by an external proxy which sits outside the 1841.
09-08-2008 11:23 AM
.
09-08-2008 04:14 PM
It's unclear from your diagram, what's on the other side of the cloud, and what the cloud represents. Generally, you want to first place QoS on both ends of your WAN (leased line) link since it's often has the least available bandwidth (compared to typical LAN links).
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