RE: [Sipping] overlap summary

[Adam Roach <adam@dynamicsoft.com>]

> -----Original Message-----
> From: Michael Hammer [mailto:mhammer@cisco.com]
>
> I think the main issue is the effect this design will have on the 
> Answer-Seizure Ratio.  Customers measure the quality of the GWs and 
> switches on this and demand better.  I believe this is what 
> you refer to as 
> the hung-IAM problem. 

You picked up on the term Jon was using, but seem to have completely
missed the point he was making with that term.

A distillation of what he said is: using the mechanism we have defined,
you can architect a network that causes hung IAMs, and you can architect
a network that does *not* cause hung IAMs. It's the service provider's
choice.

If the Answer-Seizure ratio is a critical measure for service providers
who insist on using overlap dialling, they will choose to give up some
routing flexibility in exchange for fewer or no wasted IAMs. If they
decide that they are willing to waste a few IAMs in exchange for more
flexible routing, they can do so. It's their choice, and we see no reason
to place restrictions on the protocol that artificially limit what is
fundimentally a business and engineering decision that carriers certainly
have the competence to make themselves.

/a

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