[Asterisk-Users] Hardware to build an Enterprise AsteriskUniversal Gateway

[Doug Shubert]

>
> Does your telco provide you with SLAs that make five 9s reasonable at
> all ?
>

LOL... Our telco services could be down for several hours at a time.

We found than most US Broadband carriers (DSL and Cable) offer a
"best effort" zero SLA service. If you are using broadband as a primary
transport, expect the failure points to be "up stream" more than "in house".

> Do you really need five 9s ? There is no such thing I'm aware of in
> enterprise grade telephony.

Cisco has a white paper "IP Telephony: The Five Nines Story"
http://www.cisco.com/warp/public/cc/so/neso/vvda/iptl/5nine_wp.htm

My take on the "nine's" is that Telcordia SR-323 / Bellcore MIL-HDBK-217
attempted to predict reliability of individual electronic components, and
marketing
departments have used the predictions as sales tools to best an opponents
product.


> You have to go to "carrier grade"
> equipment, which asterisk, and PCs in general, are definetly not aimed
> at.
>

Most Carrier and even Enterprise phone equipment use a "blade" design.
PC's can be configured in a hot swap blade design.

Doug



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