This is configured through 2 new parameters:
ringback-during-collect=yes|no
ringback-file=<wav file path>

You may not want to use this if your E&M lines are connected to traditional phones, otherwise
you will hear ringback tone while pressing digits. This is mostly useful with old switches that do
not provide ringback tone but the user is already done dialing (perhaps the signaling was converted from
ISDN to E&M and the full number was received in a single SETUP message)

FS-5530 --resolve this will make it identical to the bridge behaviour even when the bridge in early media begins and now you will explicitly need continue_on_fail=true in this situation to not fail

The state FTDM_CHANNEL_STATE_RINGING is not used when there is media available. We have
FTDM_CHANNEL_PROGRESS_MEDIA for that, therefore the pri_acknowledge() call should not set
the info argument to avoid sending an indication of media to the other end, as that may cause
the other end to not generate any ringing tone and at that moment we will not be generating
any ringing tone either and the caller will hear only silence

Fix applied to Punchblock here: https://github.com/adhearsion/punchblock/commit/cef5198e80b60e19fc949b21f6e0dc438cecc5df

skypopen: OSS driver has active timers only on active devices (eg: when it's actually used by a skypeclient)

FS-5531 --resolve add another optional param to supply flags for either behaviour n for null and b for boolean