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QoS ASA5505 for SIP Traffic

Steven Tolzmann

Hi all,


My company has been having trouble lately with VOIP phones cutting out, and garbled transmissions. I wanted to implement QoS to possibly improve call quality, but only want to have 2 groups:

1) SIP

2) Best Effort


We use exclusively ASA5505s, and we have a Hub & Spoke VPN Network setup, with the VOIP Box (Trixbox) being situated on the Hub network. It has a SIP Trunk to a VOIP Provider on the internet.

We have AASTRA Phones at each site, and they use a Split-Tunnel L2L VPN system to connect back to the HQ (Hub).

I made a crude drawing of our network (attached)


What is the basic configuration to prioritize VOIP Traffic over all VPN Links, and from the Hub to the Internet? I could not find any helpful configuration examples on the internet.


Thanks in advance!

-Steve Tolzmann

1 Reply 1

Brian Meade
Rising star
Rising star has some examples for setting up the priority queue for DSCP EF traffic assuming the DSCP taggings are making it through the network to the ASA.

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