The Callmanager is responsible only for Signaling not for the voice path (RTP). Before the CCM connect the to Partys, he will give the IP Address of C to B, so they can have the Voice Path set between them (or more precisely between the Gateways on those sites).
What i would recommend, is to use a sniffer (ethereal the best) to sniff traffic from your PC connected to your Phone, while you are making the Call. You will get the whole picture of what s exactly happening (sccp/RTP)
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.