Reference9: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.

See Reference9:PBX/Objects#General_Object_Properties for generic object properties.

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. If innovaphone IP-DECT or analog gateways are used as endpoints as well, the address 224.0.1.41 should be used.
  • 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 signalled to users who are currently busy if this check box is checked. Then the current call is put on hold automatically. By default, busy users are not signalled.
  • No automatic Connect: Called endpoints do not connect automatically, but ring instead.

Please note: called endpoints must support innovaphone's accept call immediately signalling feature, otherwise they will just ring until the user goes off hook. Also, multicast media stream must be supported, which is true for all innovaphone phones (except DECT) and the IP21's DOOR interface.

Please note: Coder and Packetization only "preferred media settings" for a call to the object. The settings of the calling phone takes over. (Example: If you change the framesize on the phone, the framesize to the multicast IP also changes - because the PBX does not repack the stream when a MCast call is executed.)

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