Duplex Conference 10.45

This AlphaCom feature is under development and is not yet released!

The duplex conference feature is currently being upgraded in the AMC SW. The revised Duplex Conference will be released soon, in some version 10.45. See Duplex Conference for description of the existing version. The remaining text describes the difference from the old version. This text will eventually be merged into the main article.

Whats new

Mixing in DSP

The new duplex conference do the mixing in the DSP of the AMC-IP board. No AGA board is required, neither any AlphaPro configuration.

This means that the conference audio is limited to 7kHz bandwidth, also for internal members.

IP calls supported

Calling into Duplex Conference is now properly supported.

• Calling from stations wired to slave modules linked with IP audio now works.
• Use of line echo cancelling versus voice switched duplex is greatly improved. This makes calling from IP stations and AlphaNet more useable.

An important change is local ASLT/ATLB stations use a Line Echo Cancellation (LEC) resource when going off hook. This is required so that members connecting via IP do not receive annoying echo. An other positive effect of using LEC is that it reduces the risk of "howling" when having large number of offhook members in a conference.

Up to 16 members in a duplex conference

The max number is now 16 (up from 4). It remains to be tested whether this is actually useable, in terms of audio quality. There are also a number of resource constraints that can limit the number of participants, see next section.

Conversation timeout

The Conversation timeout is now active on duplex conference members, in exactly same way as in a normal conversation. Each member starts its own timer when joining the conference, so each member is disconnected individually when her time is out.