diff --git a/src/components/pages/PbxConfiguration/CscPbxDeviceConfigKeyForm.vue b/src/components/pages/PbxConfiguration/CscPbxDeviceConfigKeyForm.vue
index 0561b082..cf7eec66 100644
--- a/src/components/pages/PbxConfiguration/CscPbxDeviceConfigKeyForm.vue
+++ b/src/components/pages/PbxConfiguration/CscPbxDeviceConfigKeyForm.vue
@@ -152,7 +152,7 @@ export default {
             target_number: {
                 required,
                 onlyChars: function (value) {
-                    const regExpTargetNumber = new RegExp("^[*#0-9]*$");
+                    const regExpTargetNumber = new RegExp("^[*#0-9+]*$");
                     return regExpTargetNumber.test(value)
                 }
             }
@@ -297,7 +297,7 @@ export default {
                     field: this.$t('Target number')
                 })
             } else if (!this.$v.changes.target_number.onlyChars) {
-                return this.$t('{field} must consist only of numeric characters or the symbols * or #.', {
+                return this.$t('{field} must consist only of numeric characters or the symbols +, * or #.', {
                     field: this.$t('Target number')
                 })
             } else {
diff --git a/src/i18n/en.json b/src/i18n/en.json
index 62d2346e..7475d58f 100644
--- a/src/i18n/en.json
+++ b/src/i18n/en.json
@@ -562,6 +562,6 @@
     "{field} must be at least {minValue} second": "{field} must be at least {minValue} second",
     "{field} must be maximum of {maxValue} seconds": "{field} must be maximum of {maxValue} seconds",
     "{field} must consist of numeric characters only": "{field} must consist of numeric characters only",
-    "{field} must consist only of numeric characters or the symbols * or #.": "{field} must consist only of numeric characters or the symbols * or #.",
+    "{field} must consist only of numeric characters or the symbols +, * or #.": "{field} must consist only of numeric characters or the symbols +, * or #.",
     "{field} must have at most {maxLength} letters": "{field} must have at most {maxLength} letters"
 }
\ No newline at end of file