Jitter Latency and Round Trip Delay

[wstadmin]

Can anyone tell me what the optimal values are for these values in the SPA 3000 when making/receiving a call? and what setting in the SPA 3000 can effect them to make the values more optimal?

My Values are as follows:

Call 1 Decode Latency: 80 ms (ranges from 80ms to 150ms)

Call 1 Jitter: 2 ms (usually 0-2ms)

Call 1 Round Trip Delay: 0 ms


From everything I've read it appears that these numbers are very important to the quality of the call.

Thanks

[MikeB3]

I suspect the answer is little.

Decode latency is probably primarily codec choice dependant. Look at a list of codecs and latency (for encode and decode ?) is often listed. Higher bandwidth codecs have in general lower encode and decode latency. e.g. G711

Jitter - this is network dependant. Not much you can do except to choose a provider with lower jitter. 2msec is about as low as it gets anyway so this is nothing to worry about.

Round trip delay. Firstly, I don't think it is really 0msec. You probably don't have RTCP packets being sent so no value is being populated. On the SIP page, set the RTCP interval to be 50msec. Once you have a real delay value, to minimize it, call someone close to you or get a better provider.