NEC Univerge SV8100 General Description Manual page 121

UNIVERGE SV8100
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Unicast/Multicast Paging Mode
Enhancements
This feature added with Version 3000.
With Version 3000 or higher software the IP terminals (DT7XX) can now receive an
Internal Page via a Unicast or Multicast packet based upon system programming.
This feature allows IP terminals (DT7XX) to be assigned to Unicast Mode, Multicast
Mode, or Auto. Prior to Version 3000, Unicast paging was not an available option.
When the phone is set to Unicast Mode the internal paging is sent to the phone via a
Unicast Packet.
When the phone is set to Multicast Mode the internal page is sent to the phone via a
Multicast Packet.
When the phone is set to Auto, the internal page is sent to the phone either by
Multicast or Unicast based on the subnet of the IP station. If the DT7XX terminal is in
the same subnet as the IPLA then it will receive the Internal Page via a Multicast
Packet. If the DT7XX terminal is in a different subnet than the IPLA the DT7XX will
receive the Internal Page via a Unicast Packet.
When phones are set to receive Unicast packets the IPLA will send a separate RTP
stream to each phone that is set to receive the page. E.g. If there are five DT7XX IP
phones in the page group and they are all set to Unicast Page Mode the IPLA will
send five separate RTP streams utilizing five DSP resources.
When the phones are set to receive Multicast packets the IPLA will send one RTP
stream. Multicast is a protocol that allows one device to communicate to multiple
devices without the need to stream to the individual end point. E.g. If there are five
DT7XX IP phones in the page group that are set to Multicast Mode, the IPLA will send
one RTP stream utilizing only one DSP resource.
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