I have set the auto_inv_100() parameter from the TM module so i can get automatic "100" replies to the INVITE. However,  in some cases i want to reply to the INVITE with provisional responses (181 for example) and i would like that "100" could be sent before the "181".

In order to achieve this, on transactions that are going to be replied with 181 i'm turning off the parameter with t_set_auto_inv(0) and the sl_send_reply("100","Trying"). Is this the best way to do this?

Thanks