[Serusers] request for comments

[Klaus Darilion]

1. How will you do the load balancing? Do the several ser servers have a 
single IP address? As the clients are behind NAT, the NAT traversal 
always has to be done by the proxy which acceptet the registration of 
the client (only this IP address is allowed to traverse the NAT in case 
of symmetric NATs).

Furthermore you have to ensure that all messages of a transaction 
traverse the same proxy.

Another point is that only the SIP proxy which acceptet the registration 
knows about the current location of a UA, except you use the t_replicate 
feature.

billing: as long as all SIP proxies write their account data into the 
same database you have a single billing mechanism. btw: don't you have a 
more reliable source for CDRs like a PSTN gateway?

Klaus

Jev wrote:

> 
> 
> I have made a diagram using Dia, of a ser footprint that I would like to 
> put together.
> 
> http://www.ecad.org/~jev/ser/SerFootprint.png
> 
> The idea is that all user accounts, and locations (Down to ser/rtpproxy 
> fronted) will be stored in the main Billing/User accounts back end. I 
> want to have a farm of front end ser machines which will just proxy 
> invites/registers/byes to the back end for authentication, 
> authorization, and billing, and also proxy RTP by means of either Maxims 
> rtpproxy or AG's mediaproxy.
> 
> The front end SERs will be able to come and go, and our cisco router 
> will manage the balancing (using things like 'sticky IP').
> 
> Depending on load we can just add more front end ser machines, and also 
> possibly add more back end machines (using the t_replicate() mechanism) 
> if need be.
> 
> Currently I'm playing around in my test network getting this footprint 
> to a functional state, I wanted to share the idea with community and see 
> what you guys think of this setup? Weaknesses, [over|under] complicated?
> 
> It is possible that some front end machines would be specific for a 
> certain group of phones, based on latency (Different physical location). 
> My main requirement is that I have a single billing/accounting 
> mechanisism...
> 
> Calls from one end point to the other will allways be mediated through a 
> RTP proxy on one of the front end machines.
> 
> What do you guys think?
> 
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