I want add Alert-info header in 183 sip response. I added this header by modifying asterisk chan_sip.c file. But I need to add it from “extensions.conf”, how distinctive alerting has been done. I tried with SIPAddHeader() function in “extensions.conf”, I could not success. Please help me in this regard. Because I need to give file path in Alert-Info for playing Announcements.
Girish kumar S