Settings/require prack/DESCRIPTION

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Defines whether Required:100Rel will be send or not.
This influences whether a early-dialog via PRACK will be established (if the opposite offers this by sending Supported:100Rel) or not.
This could be useful for playing announcements or music/ring-back-tones during the time the call is in Ringing-state.
Even if set to off, the phone will still offer 100Rel in the Supported-Header if it sends the INVITE (is the originator of the call). If B responses with Required: 100Rel it will send the ACK, independent of this setting.
For preventing sending 100Rel as supported (and by that sending PRACK) you have to set additionally send_prack to off.
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