[Serusers] How Many Nines?

[Jeremy A]

Hello,

I'm looking at a project which requires a higher than normal reliability 
for a SIP server. The project involves risk-of-life communications. The 
volume of traffic is quite low.

I have been using SER in embedded applications for some time now without 
problems but I am now looking at a larger scale project.

Assuming I can provide hardware server(s) with suitable characteristics, 
then :

- How reliable is SER?
- In each version?
- In each module?

Are there any well established high availability configurations for SER?

Are there any risk-of-life deployments I can reference?

We may well use SEMS for part of the project so the same questions apply.

I'm not expecting 100% reliability, just a system that matches or 
exceeds present high reliability PABX deployments.

If you are of the honest opinion that SER is not good enough, what SIP 
server products should I be looking at? Or is SIP not suitable full stop?


Thanks in advance

Jeremy