I read in the Asterisk Whitepaper, that you can run two cloned servers, one as a primary, one as a backup, and have them automatically failover to the other unit when it crashes, or when you need to restart it. The primary application of course, would be ensuring calls can be made when frequent updates are being handled, or when an update must be restarted on a busy network.
The term TDM is banded around too, but from my knowledge, TDM is trunking (probably some clever acronym relating to trunking), and in Asterisk's case, using the IAX protocol. This leads me to the big question;
Is there anyway of shifting the load of one Asterisk server to another without breaking or loosing a call?
I know that with Survivable Routing (Cisco's big on this), the ISDN interface is actually a router; so the Proxy is just used to decide the destination and LCR functions, and then hands off to a router. This of course, if a Proxy went down, would just prevent new calls from being made, whilst existing calls can continue merrily - until someone switches the Router off, or corrupts the IOS settings :-)
At least with Routers, you can configure them to load manager effectively, but how do you backup and load manage Asterisk??
I using SIP, and will be using a bit of SCCP too, so any suggestions would be most grateful!!
Regards, Ad.
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