Call Transfer with Analog Phone on FXS Port

I would like to transfer calls on my analog phones connected to my FXS ports to another phone. I've searched on Cisco.com and couldn't find anything.

My current call flow has all incoming calls going to a wireless phone connected to an FXS port that has an ephone-dn assigned to it. I need to be able to transfer calls to another phone if needed.

Thanks,

Josh