How to change only IP packet's destination address?

Hi,

Thank you again for helping.

I've wireshark'd the backend server and looking at the received IP packet when the SIP INIVTE is received (over TCP), all I see is that either:

1. the source address is the IP address of F5's service interface and the destination address is that of F5's virtual IP
2. ...or, the source address is the client's IP address and the destination address is that of F5's virtual IP

If as you say, address translation is occuring, is there a way for me to control the address translation of the destination address, such that when the IP packet is received at the back end server, its :

• source address is the client's IP address and
• the destination address is that of the pool's node (back end server's).

It feels like this is a relatively straightforward task, but being new to F5, I'm starting to struggle.