DTMF digits were sent up to socket in locked state.
Receive audio stream was not enabled in certain condition.
Signed-off-by: NAndreas Eversberg <andreas@eversberg.eu>
Signed-off-by: NKarsten Keil <keil@b1-systems.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>