06-25-2007 10:12 AM - edited 03-03-2019 05:36 PM
I've got two 1841 routers with adv sec IOS connected via a 3Mbps bonded T1 PtP circuit. Both offices have Avaya IP Office systems and I need to implement QoS for VoIP calls between these two offices. There is no "auto qos" on the adv sec image, which is needed for the firewall, vpn, etc., so need help with a (hopefully) basic manual QoS configuration. I'm told RTCP ports to QoS are 49152 to 53246, and not much else. Can anyone point me in the right direction with a config?
06-25-2007 11:02 AM
You can do something like this
class-map match-all voice
match ip rtp 16384 16383
class-map match-all signalling
match ip dscp cs3
policy-map QoS-to-P2P
class voice
priority 1024
class signalling
bandwidth 300
class class-default
fair-queue
Interface multilink 1
Max-reserved-bandwidth 100
service-policy output QoS-to-P2P
HTH, rate if it does
Narayan
06-25-2007 11:28 AM
Hi,
Just to add a small info about RTP ports, the RTP RFC-1889 stipulates that an even port number be used for the RTP stream and the next subsequent odd port number be used for the corresponding RTCP stream, these ports are in the range 16384 - 32767.
HTH,
Mohammed Mahmoud.
06-25-2007 11:38 AM
In case you want the RTP audio as well as the RTCP stream to be prioritised, you can change the class map to
class-map match-all voice
match access-group voice
ip access-list extended voice
permit udp
HTH,
Narayan
06-26-2007 07:27 AM
I strongly recommend you implement DiffServ QoS for voice services.
If you use access lists you run the risk of having non-voice traffic tagged and placed in your Voice Queue.
I am not familiar with the Avaya equipment but I am sure they must have a guide on how to configure a Cisco switch to mark voice packets with the appropriate DSCP marking(normally EF).
06-26-2007 10:56 AM
I agree 100% with bgibson above.
1. make sure your phones mark RTP as EF. Usually this is the default or very easy to configure.
2. In the service policy, match dscp ef.
That's it.
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