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. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

QOS Question

Does this look like it would work?

class-map match-any voice

match ip rtp 16383 16383

match access-group 101



policy-map goodvoice

class voice

priority 96

class class-default



nterface Serial0/0

description Point-to-Point to xxxxxxx

ip address 10.10.x.x

encapsulation ppp

service-policy output goodvoice



Re: QOS Question

If you are reserving 96 K of bandwidth for voice it looks good

Re: QOS Question

If you are g711 codecs for each call, the bandwidth reqd per call is 64kbps. With this setting, the guaranteed bandwidth is good for one g711 call. I would recommend, using a low bandwidth codec such as g729 over the wan. This would reduce the bandwidth per call to 8 kbps. You can further reduce the BW reqd per call, by using cRTP. With this the BW per call will reduce to approx 5 kbps.

Also on ppp links, you can additionally configure link fragmentation and interleaving (this is not mandatory), so that large data packets doesnt create delay for voice packets. Large data pkts will be fragmented and interleaved between voice packets.

What telephony system are you using. Is it a CallManager/IP Phone system??? Then you can define the remote phones to fall in a separate Region and then assign g729 codec for all calls going to that region.