leblanc
asked on
VoIP jitter
Before I googel around. I know that from Cisco, an acceptable VoIP deplay is 150ms one-way. I'd like to get some feedback on what is an acceptable jitter time for VoIP. Is it depending on the codec? Is it depending on the network devices?
I have a Cisco switches infrastructure and I have NEC VoIP phone.
Thx
I have a Cisco switches infrastructure and I have NEC VoIP phone.
Thx
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OK. This is where you will have to ask you MPLS provider IF they are applying QoS to your circuit and what policy are they using. From there you will have to match those settings on your router. This needs to be an exact match for QoS to properly work.
ASKER
no I understand, They are applying QoS on their circuit.
I am injecting packets with iperf to test my jitter. My question is not about QoS. It is about jitter. What is a reasonable response time for VoIP jitter? and how big is the packet size for g711 and g729?
I am injecting packets with iperf to test my jitter. My question is not about QoS. It is about jitter. What is a reasonable response time for VoIP jitter? and how big is the packet size for g711 and g729?
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ASKER
So what is a reasonable response time for VoIP jitter? I am using iperf to get some stats and I have in average 6ms for the jitter. I am simulate UDP traffic with 64kbps packet size. But I am not sure if 6ms is a reasonable time for jitter.
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ASKER
"Anything under 30ms should be fine. " Where can I validate this statement? Thx
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ASKER
That is exactly what I am looking for http://www.ciscopress.com/articles/article.asp?p=357102. Thank you very much.
ASKER
What is the recommended jitter for g711 or g729? is it 2ms? 10ms? 17ms?
How about the buffer for UDP for voice?
How big is the packet size for g711 and g729?
Thx