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686 ◆ Features Aspire Software Manual
Group
CODEC / Frame (VIF)
Number *
Comments
Group 1 G.711 / 30ms • No compression
• Best voice performance
• Most restricted in the quantity of calls
• With a 32VOIPU, 12 channels are possible
with this setting. The remaining 20 channels
must use one of the Group 3 settings shown
below.
Group 2 G.723 / 30ms • Mid-range compression
• Good voice performance
• Some restrictions for the quantity of calls
• The maximum number of resources for a 16
or 32 VOIPU PCB is 16 using these settings.
With a 32VOIPU PCB, only 16 IP telephone
conversations are possible - the system can
not currently support 32 conversations. (Pro-
gram 84-11-07 indicates that VIF rates higher
than 50ms are possible, however, this will
only possible with a new release of the media
gateway card (which is not yet available).)
• As the default compression recommendation
for remote applications is to use G.729a, the
current 16-channel VoIP media gateway
daughter board provides no additional chan-
nels. It is recommended to use multiple 16-
channel media gateway PCBs rather than 16-
channel daughter boards when more than 16
channels of G.729a compression is required.
G.729 / 30ms
G.729 / 40ms
G.729 / 50ms
* VIF 20ms is supported only when there is no VOIPDB (daughter board) used.
VIF 20ms is applied by the H.323 trunk only.
VIF 20ms is supported for G.711 and G.729. It is not, however, supported with the 32VOIPU
PCB.
With G.711 or G.729 at VIF 20ms, the maximum number of simultaneous calls is 15 with a
16VOIPU.