[cisco-voip] Voice Delay

[Ryan Ratliff]

What type of IP phone are they using and what phone load?

There was a bug in some of the early signed loads where a 7940/60 would 
not ARP for an IP address for up to 30 seconds.  This caused exactly 
the type of issue you describe.  A sniffer trace of a call with this 
delay will clearly show the phone sending the ARP, gets the reply, then 
starts sending audio.

-Ryan
On Nov 15, 2004, at 11:28 AM, Blomfield, Adam wrote:

> I have several remote sales offices that are connected to our 
> CallManager cluster over internet VPN connections. Most of the time 
> they work fine; other than the occasional voice breakup that is to be 
> expected when running over a public network. One problem that seems to 
> come up is a delay in establishing the voice path. This happens at one 
> office on a very regular basis. The phone will ring and the user will 
> pick up the receiver, however it takes about 10 – 15 seconds for the 
> voice path to be established. They find themselves repeating “hello… 
> hello?” into the handset about three or four times before the other 
> person can hear them. The seems to be happening most frequently on 
> external calls. The sites all have local PSTN connections coming into 
> FXO ports on a local 2600 series gateway. This is used for both 
> incoming and outgoing calls. I don’t see how where the latency is 
> occurring as the voice traffic never actually traverses the WAN. The 
> call control packets are obviously happening as the phone rings, and 
> after that everything should be local so there should be no delay. 
> Does anyone have any ideas?
>
>
>  Thanks,
>  Adam
>
> _________________________________________
>
> Adam Blomfield
>  WAN Administrator
>  Information Technology
>  Sulzer Chemtech USA, Inc.
>  E-Mail mailto:adam.blomfield at sulzer.com
> Internet http://www.sulzerchemtech.com
> _________________________________________
>
>  
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