Description

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.


Web User Interface

Advanced - SIP/RTP (Tab) - SIP(Section)__Require PRACK


Phone User Interface

N/A


Auto-provisioning

ParameterValid value
<require_prack perm="PERMISSIONFLAGS">VALIDVALUE</require_prack>
  • On -> Required:100Rel and Prack will be send (if offered by opposite)
  • Off -> Required:100Rel and Prack wont be send (even if offered by opposite)