diff --git a/app/src/main/kotlin/com/tutpro/baresip/Account.kt b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
index 5dd3fa19..3debb6a4 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Account.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
@@ -125,7 +125,7 @@ class Account(val accp: Long) {
         if (answerMode == Api.ANSWERMODE_AUTO)
             res += ";answermode=auto"
 
-        res += ";ptime=20;regint=${regint};regq=0.5;pubint=0;call_transfer=yes"
+        res += ";ptime=20;regint=${regint};regq=0.5;pubint=0;call_transfer=yes;100rel=yes"
 
         var extra = ""