[cisco-voip] Providing phone service in Mumbai and Johannesburg

[Matthew Saskin]

I've had the following setups running with quality ranging from "usable" 
  to "good".  Provided end-user expectations are managed properly this 
can  be made to work.

-Cluster located in Tokyo servicing offices as far out as Sydney (200ms rtt)
-Cluster located in Eastern United States servicing offices in London 
and Bangalore.

Other than what you already mentioned (delay to dial-tone) things are 
rather usable.

-matt

Robert Kulagowski wrote:
> Opinions / experience wanted:
> 
> Backhaul call control to a CM cluster in London or put a standalone CM 
> at each location?  RTT isn't terrible, and in Sydney (which is 
> backhauled to U.S.) the latency results in delays with dialtone, etc, 
> not voice quality (because we only do centralized VM, it's essentially a 
> half-duplex stream, so the latency isn't really noticeable).
> 
> Concerns are the cost of a CM at each location, since offices have to 
> pay for their own equipment.
> 
> In a perfect world, Cisco would have a version of IOS that provides 
> local call processing (so that sites never go into SRST), with global 
> configuration using CallManager (so that you're not learning a whole new 
> paradigm / programming IOS)  So CME and SRST mode don't fit the bill 
> because the help desk isn't trained for IOS-level access...
> 
> Also, in this perfect world, you can forward any line on the phone.
> 
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