Use the new parameter immediate-forwarding-numbers to configure
immediate forwarding logic that emulates hunt groups
The parameter syntax is:
[<span-name>:]<number>
Multiple elements can be specified separated by commas
If the <span-name> is specified, the span will be checked for
availability, if available, its number will be selected for
forwarding, otherwise next number will be checked
Forwarding is enabled as soon as a channel is answered and its
disabled when the channel is hung up
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