Hi,
I need to extract ISUP parameter 'Redirecting number' from SIP-I INVITE request and add it as SIP header with 'X-' prefix to process in FreeSWITCH. I tried to read https://kamailio.org/docs/modules/5.1.x/modules/sipt.html (but it is about updating headers) and https://kamailio.org/docs/modules/5.1.x/modules/ss7ops.html (but I have only ISUP encapsulated in SIP), so not found any solution. Help me to find it please.