configuring the SDP parameters for INVITE??

[gemofjohn]

Hi,
I am using the free download of 3CX soft phone. Can I configure SDP parameters such as
* Remote address for media
* Transport port for media
to some value other than the softphone's address.
For example, when I make a call, the INVITE message will have contact address of 10.11.12.2 and the SDP's remote address for media should have 10.11.12.10
thanks in advance..