[Serusers] INVITE retransmission

Hi, how can I distinguish, in ser.cfg, a retransmitted INVITE from the new INVITE? I need to invoke some functions only for the new INVITEs before transmit them. Regards Daniele ********************************************************************** The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, or distribution of the message, or any action or omission taken by you in reliance on it, is prohibited and may be unlawful. Please immediately contact the sender if you have received this message in error. **********************************************************************