VoIP issues with my Cisco 831. (torrents & pulsing voice)

Author	All Replies
Sameer join:1999-07-24 Yorba Linda, CA	VoIP issues with my Cisco 831. (torrents & pulsing voice) when i download torrents and am on the phone (lingo VoIP service) the person on the other end complains that my voice constantly cuts in and out. the moment i terminate the torrents, everything is fine again. i thought i had this problem solved with my current configuration, but it seems like it's not the case. can someone please look at my configuration and see what needs to be tweaked? thanks. version 12.3 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname pluto ! boot-start-marker boot-end-marker ! enable secret 5 xxxxxx ! aaa new-model ! ! ! aaa session-id common ! resource policy ! ip subnet-zero ! ! ip nbar port-map sip udp 5060 5061 5062 5063 5064 5065 no ip dhcp use vrf connected ! ! ip cef no ip domain lookup ip domain name solhome.com no ip ips deny-action ips-interface ip ssh time-out 60 ip ssh authentication-retries 2 ip ssh logging events ip ssh version 2 ! no ftp-server write-enable ! ! username xxx password 0 xxx ! ! class-map match-any warcraft description warcraft match access-group name warcraft class-map match-any VoIP match protocol rtp audio class-map match-any normal_traffic match protocol http match protocol secure-http match protocol dns match protocol smtp match protocol pop3 match protocol ntp match protocol icmp class-map match-any sip match protocol sip ! ! policy-map MyQoSPolicy class VoIP set dscp ef priority 90 class sip set dscp ef priority 10 class normal_traffic bandwidth 20 class warcraft bandwidth 10 class class-default fair-queue ! ! no crypto isakmp ccm ! no crypto ipsec nat-transparency udp-encaps ! ! interface Ethernet0 description LAN Link ip address 10.10.100.1 255.255.255.248 ip nat inside no ip virtual-reassembly ! interface Ethernet1 description WAN Link ip address dhcp ip nbar protocol-discovery ip nat outside no ip virtual-reassembly duplex auto service-policy output MyQoSPolicy ! interface Ethernet2 no ip address shutdown ! interface FastEthernet1 duplex auto speed auto ! interface FastEthernet2 duplex auto speed auto ! interface FastEthernet3 duplex auto speed auto ! interface FastEthernet4 duplex auto speed auto ! ip classless ip route 0.0.0.0 0.0.0.0 dhcp ! ip http server no ip http secure-server ! ip nat inside source list OUTBOUND_ADDRESSES interface Ethernet1 overload ip nat inside source list VPN interface Ethernet1 overload ip nat inside source static udp 10.10.100.6 12365 interface Ethernet1 12365 ip nat inside source static tcp 10.10.100.6 12365 interface Ethernet1 12365 ip nat inside source static udp 10.10.100.6 6112 interface Ethernet1 6112 ip nat inside source static tcp 10.10.100.6 6112 interface Ethernet1 6112 ! ! ip access-list standard OUTBOUND_ADDRESSES permit 10.10.100.4 permit 10.10.100.5 permit 10.10.100.6 permit 10.10.100.2 permit 10.10.100.3 ! ip access-list extended VPN permit ahp any host 10.10.100.3 permit esp any host 10.10.100.3 permit udp any host 10.10.100.3 eq isakmp permit udp any host 10.10.100.3 eq non500-isakmp permit tcp any host 10.10.100.3 eq 500 ip access-list extended allowed_ssh permit tcp host 10.10.100.6 host 10.10.100.1 eq 22 ip access-list extended warcraft permit udp any any eq 6112 permit tcp any any eq 6112 ! ! control-plane ! banner motd ^CC You are connected to $(hostname) on a private network. Use of this system may be logged or monitored without further notice. Unauthorized access is prohibited. Violators will be prosecuted. ^C ! line con 0 no modem enable line aux 0 line vty 0 4 transport input ssh ! scheduler max-task-time 5000 ntp clock-period 17179404 ntp server 192.5.41.41 end
	to forum · permalink · · 2007-08-19 17:43:16 ·
LilYoda Feline with squirel personality disorder Premium join:2004-09-02 Mountains	Heya. What is your uplink speed. The problem sounds like the torrent traffic is adding too much jitter on your voice traffic.
	to forum · permalink · · 2007-08-20 05:29:18 ·
Sameer join:1999-07-24 Yorba Linda, CA	i appreciate the fast response! here's a list of the tests i just ran, because i'm unsure as to the upload speed as well (roadrunner keeps changing it.) so i guess that averages out to 479.8
	to forum · permalink · · 2007-08-20 06:01:09 ·
LilYoda Feline with squirel personality disorder Premium join:2004-09-02 Mountains edit: August 20th, @08:22AM	reply to Sameer I'm guessing you might have a problem where your router doesn't know about the uplink speed, since you're connected via ethernet... I had the same problem with Charter and my 4500. If you look on my (very) old post, I think there are additional policies where I force the uplink traffic to a specific speed (I used to shape it to 171 to have up to 256Kbps uplink, but you can probably go for a total of 384 or 448 Kbps) Link to the old post: »[Config] QoS+VoIP on a Cisco - sample config If you take 384Kbps as the total uplink, I'd say the config should look something like policy-map MyQoSPolicy class VoIP set dscp ef priority 90 class sip set dscp ef priority 10 class normal_traffic bandwidth 20 class warcraft bandwidth 10 class class-default shape average 234000 bandwidth 234 fair-queue ! interface Ethernet1 bandwidth 384 max-reserved-bandwidth 95 service-policy output MyQoSPolicy tx-ring-limit 2 tx-queue-limit 2 The only drawback is that you force the class default to use 234Kbps max, even if there is nothing else in the other classes. 234 comes from 384x95%-(all the bandwidth assigned to the other classes=130) There may be a better way, but that's the best I could find -- "Money and sex, storage and bandwidth: only too much is ever enough" Arno Penzias - Former Head of Bell Labs, and Nobel prizewinner
	to forum · permalink · · 2007-08-20 08:21:02 ·
bbtech6650 Premium join:2004-10-28 Pittsburgh, PA	reply to Sameer I have qos setup on my 2621... I have a rate-limit on my external facing interface.... no ip address rate-limit input access-group 106 128000 65536 65536 conform-action set-prec-transmit 5 exceed-action set-prec-continue 0 rate-limit input 4096000 4096000 4096000 conform-action transmit exceed-action drop Heres the access-list 106 access-list 106 permit udp any any eq 4569 access-list 106 permit udp any any eq 5004 access-list 106 permit udp any any eq 5060 access-list 106 permit ip host 70.87.18.x any access-list 106 permit ip host 67.55.159.x any access-list 106 permit ip host 216.89.79.x any access-list 106 permit ip host 207.174.202.x any access-list 106 permit udp any any eq 5061 access-list 106 permit udp any any eq 5062 I don't know if this applies to your ios feature set or not... Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-IK9O3S3-M), Version 12.3(12a), RELEASE SOFTWARE (fc2) Is mine
	to forum · permalink · · 2007-08-26 15:15:31 ·
Sameer join:1999-07-24 Yorba Linda, CA	thanks. i'll give it a try.
	to forum · permalink · · 2007-08-26 19:29:18 ·
mplex join:2004-04-15 Charleston, SC	reply to Sameer Add this policy and use it as the outgoing policy on the wan ethernet interface: policy-map MyQosPolicy-Parent class class-default shape average 330000 !! I use this for my 384k uplink service-policy MyQosPolicy This will prioritize the traffic under the MyQosPolicy policy at the specified rate. You can not use 384000 since you have to account for docsis overhead and bad cable service. Play with this number if you want, but always start low and increase it. If you go over, QoS will fail.
	to forum · permalink · · 2007-08-27 08:27:55 ·
mplex join:2004-04-15 Charleston, SC	Sorry for the quick follow-up, but I saw that you misconfigured your original policy-map. First of all, there is only one priority queue no matter how you configure it, so I would combine the VoIP and sip classes in to one class. Also, I would switch to percentages but that is a personal thing. If I was writing this policy map, I would do this: policy-map MyQoSPolicy class VoIP set dscp ef priority percent 50 class normal_traffic bandwidth percent 20 class warcraft bandwidth percent 20 class class-default bandwidth percent 10 For class-default, you can not combine bandwidth with fair-queue, and the way the algorithm works can completely starve that class down to nothing. This is a better configuration IMO. Also, for VOIP, throw the sip classification in with the other VOIP class. Don't forget to combine the parent policy in my last post to wrap this policy in a rate limiter. Good luck.
	to forum · permalink · · 2007-08-27 08:36:23 ·


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