Hey all, we have a 7975 with a 7916 module. We upgraded our CM 5.1 code to support the module and it see's it, we select it on the device.
The expansion module shows numbers from 1-14 for SD but if you enter anything after SD 14 it's called "abriviated dialing" which is not what we want. I enter a number into slot 15 and it doesn't show up on button 15 on the phone. It seems there isn't enough speed dials for the module on the phone configuration, any ideas?
Have a look at the Phone Button Template for the 7975. If you find the default Button Template you can Copy it/rename it (something like 7975with7916)and reconfigure it with the appropriate Speed Dial Buttons. Once this has been done go back to the phone/device in question and apply this new Phone Button Template> Update> then go to add/update Speed Dials and you will see all the keys available :)
Hope this helps!