delay of 70ms

I have a pair of Cisco 3725 routers that I'm talking through
using VOIP. I measured a mouth to ear delay of 70ms with a
standard config. Is this what I should be getting? Is there a way
to make the delay 0?

bob@coolgroups.com

<> wrote in message
news: oups.com...
>I have a pair of Cisco 3725 routers that I'm talking through
> using VOIP. I measured a mouth to ear delay of 70ms with a
> standard config. Is this what I should be getting? Is there a way
> to make the delay 0?
>

Are they connected by LAN or WAN?
What codec and packetization period are you using?
What type of voice terminal are you using?

LAN,

G.711 ulaw 20ms,

standard POTS phone


R-Guy wrote:
> <> wrote in message
> news: oups.com...
> >I have a pair of Cisco 3725 routers that I'm talking through
> > using VOIP. I measured a mouth to ear delay of 70ms with a
> > standard config. Is this what I should be getting? Is there a way
> > to make the delay 0?
> >
>
> Are they connected by LAN or WAN?
> What codec and packetization period are you using?
> What type of voice terminal are you using?

<> wrote in message
news: oups.com...
> R-Guy wrote:
>> <> wrote in message
>> news: oups.com...
>> >I have a pair of Cisco 3725 routers that I'm talking through
>> > using VOIP. I measured a mouth to ear delay of 70ms with a
>> > standard config. Is this what I should be getting? Is there a way
>> > to make the delay 0?
>> >
>>
>> Are they connected by LAN or WAN?
>> What codec and packetization period are you using?
>> What type of voice terminal are you using?
>
> LAN,
>
> G.711 ulaw 20ms,
>
> standard POTS phone

With 20ms packetization, it will be impossible to get less than 20ms delay,
because that's how much data the gateway has to collect before sending a
packet. There's also typically 10-20ms burned in the codec/DSP's pipeline.
On top of that, the receiver's jitter buffer will add a few tens of ms; most
jitter buffers, even adaptive ones, are tuned with a minimum of a few tens
of ms because it doesn't hurt, and 40ms or so of buffering will hide all but
the worst unless you have no QoS at all over a skinny WAN pipe.

70ms isn't bad, and no human should ever notice it. Don't worry about
latency until it hits 150ms.

S

--
Stephen Sprunk "Stupid people surround themselves with smart
CCIE #3723 people. Smart people surround themselves with
K5SSS smart people who disagree with them." --Aaron Sorkin


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