diff --git a/src/components/call/CscCall.vue b/src/components/call/CscCall.vue
index 54fa7004..d9e9774e 100644
--- a/src/components/call/CscCall.vue
+++ b/src/components/call/CscCall.vue
@@ -222,6 +222,7 @@
                 />
                 <q-btn
                     v-if="canStart"
+                    :disabled="!isIncoming && !isNumberInputDefined"
                     color="primary"
                     text-color="dark"
                     icon="call"
@@ -356,6 +357,10 @@ export default {
             type: String,
             required: true
         },
+        numberInput: {
+            type: String,
+            required: true
+        },
         endedReason: {
             type: String,
             default: null
@@ -536,6 +541,9 @@ export default {
         },
         callStateTitle () {
             return CallStateTitle[this.callState]
+        },
+        isNumberInputDefined () {
+            return this.numberInput !== '' && this.numberInput !== null
         }
     },
     watch: {
diff --git a/src/layouts/CscLayoutMain.vue b/src/layouts/CscLayoutMain.vue
index 5344c3f7..8ae978ac 100644
--- a/src/layouts/CscLayoutMain.vue
+++ b/src/layouts/CscLayoutMain.vue
@@ -164,6 +164,7 @@
             ref="call"
             :call-state="callState"
             :call-number="number"
+            :number-input="numberInput"
             :ended-reason="endedReason"
             :full-view="isFullView"
             :minimized="!isHome && !maximized"