You should be sure that the 7940/7960 are getting an IP address from the DHCP server (I think they never get one), you can go to your DHCP Server to see the IP assigned to the terminals and try a Ping to them.
You can also try adding a host record for ciscocm1 to your dns pointing at your cm running the TFTP service. If this is in the default domain sent out by your DHCP server the phones will resolve this to get the TFTP.
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.