Assume the following:
* Your cellphone number is 123456789
* Your extension is 503
* You want to use follow me settings for your extension, you want to be called into your cellphone
* You want to record the call that used the follow me setting
Do the following:
1. Go into PBX->Extensions->Add Extension
2. Choose from the list: Other (custom) Device
3. Set the normal parameters (display name, extension (any not used extension))
4. On the dial box put: Local/
123456789@from-internal
5. On the bottom part, choose to record inbound/outbound calls
6. Now go into the follow me settings: PBX->Follow me
7. Choose your extension
8. Under the options, choose the custom extension that you have created