The setup I imagine would be something like : - several asterisk servers called sip1.isp.com, sip2.isp.com, ... - a DNS alias sip.isp.com pointing to all the addresses (thus providing a round robin resolution on each server) - each SIP client would register with sip.isp.com (thus ending on a random asterisk servers) - but after that, all the servers would be "aware" of the registration. Thus any asterisk server would know how to route a call to SIP/<some registered user>
Same thing for IAX peers.
Of course, setting up various IAX links between each server is no problem (with registration cascading, for instance).
Registration cascading is not possible (I think) but could it be solved with a shared dial route:
Instead of DIAL(IAX/sip.isp.com) could you not DIAL(IAX/sip1.isp.com&IAX/sip2.isp.com&IAX/sip3.isp.com) to reach a similar effect ? (or chain them in different lines so it tries to reach the first one, then the second one if it fails, and the third if that fails.
Florian
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