Reference:Administration/PBX/Objects/MCast Announce

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The MCast Announce PBX object allows a call to be put through directly on several telephones. For this, a group must be defined for the MCast Announce object, and all subscribers belonging to this group are addressed. The following specifications are made in the Multicast section:

  • Multicast Address: A multicast IP address must be specified. For IPv4, the multicast address range 224.0.0.0 to 239.255.255.255 applies.
  • Multicast Port: A port must also be specified. It can be any otherwise unused UDP port of your choice. Default is 16000.
  • Coder: The coder to be used for multicast calls can be selected here. You can select from the following: G729, G711A, G711u and G723.
  • Packetization (ms): Reduces the protocol overhead, thereby increasing the bandwidth available for voice data. Bear in mind that the overhead grows significantly with reduced packet size, since the per-packet transport overhead (IP protocol in LAN and additionally PPP protocol in WAN) remains the same while the voice data payload becomes less.
  • Call Busy Endpoints: Calls are also signaled to users who are currently buys if this check box is checked. The then-current call is put on hold automatically. By default, busy users are not signaled.
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