Hi,
thanks for everyone's suggestions!
Basically, we have several options. The easiest and cheapest one is
setting up a machine with Asterisk and several SIP connections. We
"just" need local SIP dialin numbers in various countries. In Germany
that's pretty easy, worldwide it might get harder.
The other one is choosing a service that has local dial-in numbers world
wide and use it as a hosted solution. I have no clue about the costs
there, though.
The "luxury" one is having a worldwide toll-free number.
#2 and especially #3 can get quite expensive, so at first, we should
check the actual demand. I doubt we are in the need for a worldwide
toll-free number. How many people actually do use conference calls or
plan to do so? We should be reasonable here...
My try would be to first compile a list of conference services available
worldwide or locally, their costs and dial-in options, and then see what
can be covered with that. The wiki page is a good starter, I guess.
Florian
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