I have two sites on a P2P T1 connection that has been complaining about voice. The following policy map is applied on both ends of the link:
class-map match-any VOIP
match access-group 110
Extended IP access list 110
permit ip any any dscp ef (5547188 matches)
permit ip any any precedence critical (77123 matches)
permit tcp any eq 1719 any (318 matches)
permit tcp any eq 1720 any (450 matches)
permit tcp any any eq 1719
permit tcp any any eq 1720
permit udp any eq 1719 any (1 match)
permit udp any eq 1720 any
permit udp any any eq 1719 (65 matches)
permit udp any any eq 1720 (8 matches)
I *think* that the priority 768 gives voice traffic 768k of bandwidth if there's data on the line. If there's no voice traffic, data can take the full T1 connection. Is there a better way to do this policy map? They've been complaining about static and jitter lately.
Yes you should narrow it down as much as possible. Also as Edison says you are trusting all EF. You can do this but you must make sure that only you have marked traffic as such. So if you are relying on the end devices marking the traffic you need to be very careful as an end user could in theory mark all their traffic as EF.
As for working out how much bandwdith have a look at the link Edison has provided. You will need to know which codec is in use as this will have a subnstantial impact on amount of bandwidth needed.
It's more than likely done at the user end. The switches don't have qos configured on them, and the router is the only thing that's configured for qos. I don't know if marking is taking place at all actually.
I didn't set this up, but since they're starting to have problems, they want me to figure out how we can modify this. =)
"I don't know if marking is taking place at all actually"
It definitely is somewhere because of the matches in your acl's. Also you should really be considering end-to-end QOS for this setup. I am wary of introducing a whole lot of work for you but ideally you should be ensuring that only voice packets are marked with EF and that any data is marked or remarked at the ingress point to the network which is usually a switch.
No experience of Avaya system so can't really help there but there may be some people in the VOIP forums who have experience with it.
First things first, make sure your acl only references IP addresses that you know are tied to phones. Even this could be circumvented but it would be an improvement on where you are.
Do you have access to Avaya website because there should be docs on there that tell you which ports an Avaya VOIP system uses.
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