<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; ">hi,</div><div><font face="'times new roman', 'new york', times, serif">how to get the content of sip header in lua?</font><br></div></div></body></html>