You need to provide us with a little more information. Please post the entire config minus passwords.
Typical problems point to using the wrong compression for the voice. Are you using G711 or G729?
Another common error is that you must also have a bandwidth statement on the serial interfaces. Without a bandwidth statement, the software believes that it has the default bandwidth for the interface, 1.544mbps and it does not see any congestion problems.
The third is that for such a slow link, it would be good to emulate frame-relay so that you could do fragmentation of the large data packets.
The first problem I see is that you are using the "Bandwidth" command instead of the "priority" command. The priority command will create a strict priority queue for the voice traffic, so queue latency is reduced.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.