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Aspire Software Manual Features ◆ 669
● Supports Silence Suppression
● Aspire provides 5 types of CODEC for the Aspire Keyset with IP Adapter (defined in Program
84-11, selected in Program 15-05-15).
Since the packet size of G711 is larger than the other compressions (G729, G723), there are some
limitations to reach the maximum number of channels. With the default settings, the following limi-
tations must be kept in mind.
Refer to Simultaneous Calls (page 685) for more information on CODEC settings.
Deleting IP Phone Registration
➻ 90-23-01 : Deleting Registration of IP Telephones
When removing an IP telephone from the system, the registration can be deleted using this
program. Enter the extension number to be deleted, press 1 and then HOLD.
Echo Adjustment
For Enhanced Echo Adjustment, refer to Enhanced Echo Adjustment (page 679).
Where echo (reflection of voice) is generated depends on how the network is configured. Typically,
however, echo is generated at the trunk PCB (COIU) or at the telephone’s microphone/speaker. The
transmit/receive data is separated at the analog trunk interface. Echo from the transmit data to the
receive data can be generated, and when the impedance is not set correctly, increased echo will
occur. This can also occur at an ISDN/analog trunk interface. In general, the nearer the transmit, the
more echo occurs as the signal level is greater.
The type of echo can also occur with non-IP phones, but the time difference between the transmit
and receive is so small, the user is hardly aware of it. As the IP terminals require voice packetiza-
tion, there is a longer delay. This delay causes the echo.
32VOIPU (16VOIPU + 16VOIPDB)
G711 - 20ms Not supported.
G711 - 30ms The system uses G711 (30ms) for the first 12
channels of calls. The CODEC then changes to
G729 for the last 20 channels.
20VOIPU (16VOIPU + 4VOIPDB or 4VOIPU + 16VOIPDB)
G711 - 20ms The system uses G711 (20ms) for the first 13
channels of calls then changes the CODEC type
to G729 for the last 7 channels.
G711 - 30ms There are no limitations.
16VOIPU (16VOIPU)
G711 - 20ms The system uses G711 (20ms) for the first 15
channels of calls then changes the CODEC type
to G729 for the last channel.
G711 - 30ms There are no limitations.