Callback

One system-wide switch and a handful of parameters for web callback: a customer requests a call, and the system calls them back instead of them dialling out directly.

In the sidebar, go to System > Callback. This admin-only page is where callback is turned on or off for the whole installation, and where its behaviour is tuned.

Callback settings: the switch, retry/wait timing, the callback server, IVRs and per-leg CallerID.
FieldMeaning
Callback activeThe one switch that turns web callback on or off for every user.
Max. retriesHow many times the system re-attempts a callback that did not connect.
Retry time (s)How long to wait between retries.
Wait time (s)How long the system waits after the initiation call before calling back.
Web callback serverWhich registered server handles callback requests placed through the web.
Busy IVR / Failed IVRWhich IVR plays to the customer if the callback attempt reaches a busy line, or fails outright.
Leg A CallerID / Leg A custom CIDThe CallerID sent on the first leg (the call back to the customer who requested it).
Leg B CallerID / Leg B custom CIDThe CallerID sent on the second leg (the call onward to the original destination).
Note

The page's own banner states it plainly: e-mail callback (requesting a callback by sending a mail, retrieved over POP3) is not connected in this system and is left out of this page. Only web callback is configured here.

A callback dial plan itself — which numbers or DIDs a customer can call to trigger a callback — is set up elsewhere, per number; this page only holds the system-wide switch and defaults that every callback uses.

Check

With Callback active checked and a Web callback server chosen, confirm a real callback request reaches the expected phone within roughly Wait time seconds, and that the CallerID shown on each leg matches what you set here.