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Specifications
Release 3.3 37
The following examples assume that compression is not being used within the LAN, each node
is in a separate compression zone and Node A is the host of each conference call.
For example: A three-party conference is established between a TDM device and an IP device
on Node A across a LAN, and an IP device on Node B across a WAN.
• Assuming that a compression license is not required for the connection within Node
A (LAN) then one compression license is required on Node A for voice compression
to the IP device on Node B.
• Adding a conference member using an IP device located on Node B will consume
a compression license on Node A.
• Adding a conference member using a TDM device on Node B will consume a
compression license on Node A and a compression license on Node B.
For example: A three party conference is set up between an IP device on Node A, an IP device
on Node B, and an IP device on Node C. The nodes are connected over the WAN using IP
trunking.
• Two compression licenses are required on Node A for the connection to the IP
device on Node B and the IP device on Node C.
• Adding conference members located on either Node B or Node C will require an
additional compression channel on Node A for each IP device added.
For example: A three party conference is set up between a TDM device on Node A, a TDM
device on Node B, and a TDM device on Node C. The nodes are connected over the WAN
using IP trunking.
• Two compression licenses are required on Node A for the WAN connection to Node
B and Node C.
• One compression license is required on Node B for the WAN connection to Node A.
• One compression license is required on Node C for the WAN connection to Node A.
Voice mail and compression
Compression is not invoked with calls to voice mail. No licences are required.
Music on Hold and compression
Music played through an IP connection will be compressed based on the same rules as any
other connection to that phone. Because the music source is by nature a TDM device, if sent
through a connection that requires compression, it will use a compression license on the system
to which the music is connected, and on the second system of an IP trunked call if it goes to a
TDM phone there.