Queue DTMF frames to the channel if the call is terminated by Asterisk core or applications

For those calls, there no bridge created.

Also revert 44071bb7
    Fix a regression that is introduced by RTP events generated by DSP

    For those internal calls that list in extension.conf like call-forward(*21*). The Read() function
    that used to get the target number could not retrieve the DTMF with the previous fix as it is not
    received by asterisk core.

    [sip0-direct]
    exten => _*21*,1,       GoSub(sub-create_cfim,s,1(sip0))
    ...
    [sub-create_cfim]
    exten => s,1,           Read(input,,,,,300)