Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

QoS for VoIP across IPSec VPN Tunnels

When you send RTP Voice packets, as well as data packets, across an IPSec VPN tunnel between two locations, should you enable QoS on the OUTBOUND traffic only, or both outbound and inbound? Using 2821 and 2811 routers with T1 connections to the internet. Thanks! Mitchell

Hall of Fame Super Gold

Re: QoS for VoIP across IPSec VPN Tunnels

You must configure QoS on the T1 interfaces, and "qos-preclassify" under "crypto map".

See example:

Hope this helps, please rate post if it does!

New Member

Re: QoS for VoIP across IPSec VPN Tunnels

Hi, I already have QoS configured on my serial T1's and I have the "qos-preclassify" statement in my crypto maps. The question is should QoS be applied ONLY to outbound traffic or to BOTH inbound and outbound traffic? My customer is using a NEC phone system that uses the PSTN to make normal calls BUT uses VoIP to make calls between their offices across the data network.