diff --git a/app/src/main/kotlin/com/tutpro/baresip/Account.kt b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
index e2bf54a5..c04263f9 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Account.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Account.kt
@@ -206,13 +206,10 @@ class Account(val accp: String) {
         fun checkAuthUser(au: String): Boolean {
             if (au == "") return true
             val ud = au.split("@")
-            val userIDRegex = Regex("^([* .!%_`'~]|[+]|[-a-zA-Z0-9]){1,64}\$")
-            val telnoRegex = Regex("^[+]?[0-9]{1,16}\$")
-            if (ud.size == 1) {
-                return userIDRegex.matches(ud[0]) || telnoRegex.matches(ud[0])
-            } else {
-                return (userIDRegex.matches(ud[0]) || telnoRegex.matches(ud[0])) &&
-                        Utils.checkDomain(ud[1])
+            return when (ud.size) {
+                1 -> Utils.checkUriUser(au)
+                2 -> Utils.checkUriUser(ud[0]) && Utils.checkDomain(ud[1])
+                else -> false
             }
         }
 
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
index 435fd7f4..b0da4b1e 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
@@ -161,8 +161,10 @@ object Utils {
                 checkIpV6(bracketedIp.substring(1, bracketedIp.length - 2))
     }
 
-    private fun checkUriUser(user: String): Boolean {
-        user.forEach { if (!(it.isLetterOrDigit() || "-_.!~*\'()&=+\$,;?/".contains(it))) return false }
+    fun checkUriUser(user: String): Boolean {
+        val escaped = """%(\d|A|B|C|D|E|F|a|b|c|d|e|f){2}""".toRegex()
+        escaped.replace(user, "").forEach {
+            if (!(it.isLetterOrDigit() || "-_.!~*\'()&=+\$,;?/".contains(it))) return false }
         return user.isNotEmpty() && !checkIpV4(user) && !checkIpV6(user)
     }