diff --git a/app/src/main/kotlin/com/tutpro/baresip/Account.kt b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
index a0acdbf4..8f40a073 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Account.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
@@ -200,7 +200,7 @@ class Account(val accp: String) {
 
         fun exists(aor: String): Boolean {
             for (ua in UserAgent.uas()) {
-                if (ua.account.aor == aor) return true
+                if (ua.account.aor == "sip:$aor") return true
             }
             return false
         }
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
index afe6ada3..1e593f1a 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
@@ -90,7 +90,12 @@ object Utils {
     }
 
     fun checkAor(aor: String): Boolean {
-        return checkUriUser(aorUser(aor)) && checkDomain(aorDomain(aor))
+        val parts = aor.split(":")
+        if (parts.size == 1)
+            return checkUriUser(aorUser(aor)) && checkDomain(aorDomain(aor))
+        else
+            return checkUriUser(aorUser(parts[0])) && checkDomain(aorDomain(parts[0])) &&
+                    checkPort(parts[1])
     }
 
     fun checkTelNo(no: String): Boolean {
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d51b53fe..93dedea6 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -92,8 +92,8 @@
 
     <!-- Accounts Activity -->
     <string name="accounts">Accounts</string>
-    <string name="user_domain">user@domain</string>
-    <string name="invalid_aor">Invalid user@domain \'%1$s\'</string>
+    <string name="user_domain">user@domain[:port]</string>
+    <string name="invalid_aor">Invalid user@domain[:port] \'%1$s\'</string>
     <string name="account_exists">Account \'%1$s\' already exists.</string>
     <string name="account_allocation_failure">"Failed to allocate new account.</string>
     <string name="encrypt_password">Encrypt Password</string>