Red to brown

[gel3101]

Hi, I have a client who is a level 4 and has had Rusk 5.56 on her hair for the last 2 colour treatments. She would now like to go with Rusk 5.8ch with a caramel balyage. ( as shown in picture). Will I have to strip out the red first or will it be ok to apply 5.8ch straight over.
I am doing it in 2 stages. 1 day all over colour and then 2 days later do the balyage with bleach +20vol. Also any suggestions on which toner to use to get a nice caramel.
Any suggestions or advice greatly appreciated. Thanx.