For the project I'm working on, I need the user to be able to turn call forwarding on and off. They also need to be able to modify the number that the call is being forwarded to. I looked through the api and wasn't able to find anything that would help me with this problem. Could anyone point me in the right direction?
You're already in the right forum. The operation you're looking for is called updateLine (Cisco DevNet: Administrative XML (AXL) - Latest Version), and you need to know the number and partition to identify the line you want to update, and then you can use the different callForward* tags to configure callforwarding as desired.