diff --git a/app/src/main/kotlin/com/tutpro/baresip/Config.kt b/app/src/main/kotlin/com/tutpro/baresip/Config.kt
index cdfea09e..ad9658b8 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Config.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Config.kt
@@ -135,7 +135,7 @@ object Config {
         config = if (sipCuserRandom != "")
             "${config}sip_cuser_random $sipCuserRandom\n"
         else
-            "${config}sip_cuser_random yes\n"
+            "${config}sip_cuser_random no\n"
 
         val darkTheme = previousVariable("dark_theme")
         Preferences(ctx).displayTheme = if (darkTheme == "yes") {