diff --git a/app/src/main/kotlin/com/tutpro/baresip/Account.kt b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
index 845a7b70..7cea6ea6 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Account.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
@@ -153,9 +153,6 @@ class Account(val accp: Long) {
         if (autoRedirect)
             res += ";sip_autoredirect=yes"
 
-        if (blockUnknown)
-            res += ";block_unknown=yes"
-
         res += ";ptime=20;regint=${regint};regq=0.5;pubint=0;inreq_allowed=yes;call_transfer=yes"
 
         var extra = ""
@@ -166,6 +163,9 @@ class Account(val accp: Long) {
         if (!callHistory)
             extra += ";call_history=no"
 
+        if (blockUnknown)
+            extra += ";block_unknown=yes"
+
         extra += ";tel_provider=${URLEncoder.encode(telProvider, "UTF-8")}"
 
         if (countryCode != "")