Launch 3 Telecom sells a 3Com 3C421810A ISDN module for the RAS1500. They offer competitive pricing, quality customer service, and expertise in telecom products. Purchases can be made by phone, email, or online using major credit cards, PayPal, or purchase orders. Orders are shipped same day if placed before 3PM and tracking is provided. A warranty and return policy is included with all purchases. Additional services like repairs, installations, and logistics are also offered.