diff --git a/app/Models/Service/Voip.php b/app/Models/Service/Voip.php
index 4657680..b26b5c6 100644
--- a/app/Models/Service/Voip.php
+++ b/app/Models/Service/Voip.php
@@ -59,7 +59,7 @@ class Voip extends ServiceType implements ServiceItem
 	 */
 	public function getServiceNameAttribute(): string
 	{
-		return $this->service_number ?: $this->service_address;
+		return $this->service_number ?: ($this->service_address ?: 'Unknown');
 	}
 
 	/* METHODS */