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Voice QoS

We have two sites, with fibre broadband at both sites (40/10Mbps). One site has a UC500 that hosts 6 phones and 2 phones connect remotely via IPSec VPN on a Cisco 887VA router.

I am trying to apply QoS for the voice traffic for best performance over VPN but getting stuck as to where I should be applying the policy map.

 

This is a config snippet of the remote site router:

 

!

class-map match-all voice

 match protocol skinny

 match protocol sip

class-map match-all rtp

 match protocol rtp

!

policy-map voip

 class rtp

  priority 300

 class voice

  priority 100

 class class-default

  police 500000

interface Ethernet0

 no ip address

!

interface Ethernet0.101

 description **BT Fibre**

 encapsulation dot1Q 101

 pppoe enable group global

 pppoe-client dial-pool-number 1

!

interface Dialer0

 bandwidth 8000

 ip address negotiated

 no ip proxy-arp

 ip mtu 1492

 ip nbar protocol-discovery

 ip flow ingress

 ip nat outside

 ip virtual-reassembly in

 encapsulation ppp

 ip tcp header-compression iphc-format

 dialer pool 1

 dialer-group 1

 ppp authentication chap pap callin

 ppp chap hostname 

 ppp chap password 

 ppp pap sent-username 

 ppp ipcp route default

 no cdp enable

 ip rtp header-compression iphc-format

!

Am I on the right path? Should I apply the service-policy to the Dialer 0 for outgoing traffic or incoming? 

1 Reply 1

Joseph W. Doherty
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It's been years since I've worked with a dialer interface, so I'm unsure where QoS should be applied.  However, if you're working with bandwidth less that port bandwidth, you should shape for it, otherwise your QoS will only "engage" when the port, itself, congests.  Also, normally you work to provide egress QoS on both sides.

If you can manage both sides egress, especially with shaping, there's often rarely need to "police" traffic, as you're doing in your class-default.

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