Hi all, I have added nathelper support to basic ser.cfg file of Ottendorf release. It is a simple setup without any complexity of using other features such as connectivity_realm etc. You can download it at http://www.iptel.org/ser/howtos/optimizing_the_use_of_rtp_proxy File is called ser_config_2_0.txt
The more complex one will come with updated document soon.
Lada