[asterisk-users] Replacing PBX during a call in progress

A J Stiles asterisk_list at earthshod.co.uk
Thu Jan 12 11:19:54 CST 2017

On Thursday 12 Jan 2017, Telium Technical Support wrote:
> This was asked many years ago but I thought I would check to see if things
> have changed.  Is it possible to take over a call in progress - using a
> replacement Asterisk server?
> In other words, if 2 user agents are connected through an Asterisk PBX, and
> I tracked the call ID, IP of each UA (and anything else needed), could I
> remove the PBX and put a new one in its place (at the same IP address) and
> resume the call?  Somehow keeping the call up on the UA's and telling
> Asterisk to just resume a call given specified parameters (so the UA's
> wouldn't notice the change)?

I doubt there is any chance whatsoever of that working!  For a start, you 
can't have two machines on the same subnet with the same IP address.  It just 
does not work.  And there is all manner of internal state that would have to 
be replicated onto the new server.

When the clicky-clicky exchange in the village where I grew up was updated to 
System Y sometime in the early 1990s, all the phones went dead for about 30 
minutes and calls in progress were cut off.


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