[Freeswitch-users] change codec on the bypass point

Hi, I am using FS and when i make calls from "A" to "C" through "B". On the "B" i am using bypass media. "B" takes the codec list from A and send it to C as outgoing codec list. I would like to change the outgoing codec on "B" but I change anything on "B", it only using the codec list what get from "A". How can i change the codec list on "B"? Regards, Adam