[asterisk-biz] Solutions for ADSL failover and load balancing

[Alistair Cunningham]

We have a customer who would like to offer SIP over multiple xDSL 
circuits to their PBX customers. This is both for extra capacity using 
load balancing and for failover. The end customers will have a small 
Enswitch/Asterisk or other VoIP soft switch at their site, and who wish 
to use our customer's service for calls to and from the PSTN.

Failover can be done using RIP or OSPF, but load balancing SIP across 
multiple xDSLs is a bit beyond our experience. Has anyone 
recommendations of how to do this?

The DSL routers will do NAT, so there will be 2 or more separate 
external addresses (so the hosted service needs to know to deliver calls 
to all). Forwarding ports on the routers is acceptable, as is some sort 
of VPN device.

-- 
Alistair Cunningham,
Integrics Ltd,
+44 20 799 39 799
http://integrics.com/