A while ago there's a bug on softphone not working with g711alaw codec: CSCdx35121, but this should be fixed in softphone 1.3(2) and later.
Just wanted to make sure you're not running into that first. Otherwise, we need to see your gateway config as well as "debug cch323 h225" and "debug cch323 h245" if the 3640 is configured for H323 OR "debug mgcp packet" and "debug isdn q931" if it is configured for mgcp.
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.