I am trying to do some voice qos on an ASA for a SIP trunk.
voice vlan is 172.16.2.0/24 and there is a CME hanging off the ASA. So I am using DSCP to go out the outgoing interface, since my CME is already marking traffic, and coming back from the SIP provider I am just matching any traffic going to the voice vlan.
I am using shaping and the issue is a few things:
1. the voice calls are still choppy with qos applied. I test a voice call and all is well, then I start a massive torrent upload/download, and apply the qos, and the call quality suffers......not as bad as without qos and doing the torrent, but still suffers.
2. when I apply my shaping i notice via asdm the actual rate drops to about 3MB even though I am shaping at 5.6MB
here is the config, I am looking for ideas on how to make this better. Circuit is AT&T DSL of 512 up and 6MB down, I have made my shaping considerably below these values to account for PPPoE and other overhead. ASA is getting a routed connection from AT&T DSL modem.
access-list ACL-VOICE extended permit ip any 172.16.2.0 255.255.255.0
match dscp cs3
match access-list ACL-VOICE
match dscp cs5
shape average 5600000
shape average 424000
service-policy global_policy global
service-policy PM-ALL-TRAFFIC-SHAPE-INSIDE interface inside
service-policy PM-ALL-TRAFFIC-SHAPE-OUTSIDE interface outside