diff --git a/debian/resources/fail2ban/sip-auth-challenge.conf b/debian/resources/fail2ban/sip-auth-challenge.conf
index fcd4414..3f3708d 100644
--- a/debian/resources/fail2ban/sip-auth-challenge.conf
+++ b/debian/resources/fail2ban/sip-auth-challenge.conf
@@ -12,7 +12,7 @@
 #          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
 # Values:  TEXT
 #
-failregex = \[WARNING\] sofia_reg.c:\d+ SIP auth challenge \(REGISTER\) on sofia profile \'.*\' for \[.*\] from ip <HOST>
+failregex = \[WARNING\] sofia_reg.c:\d+ SIP auth challenge \((?:REGISTER|INVITE)\) on sofia profile \'.*\' for \[.*\] from ip <HOST>
 
 # Option:  ignoreregex
 # Notes.:  regex to ignore. If this regex matches, the line is ignored.