WaitForRing() — Waits the specified number of seconds for a ring



Waits at least timeout seconds after the next ring has completed.

Returns 0 on success or -1 on hangup.

    ; wait five seconds for a ring, and then send some DTMF digits
    exten => 123,1,Answer()
    exten => 123,2,WaitForRing(5)
    exten => 123,3,SendDTMF(1234)

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