The Grandstream GXP2200EXT IP Phones Extension Module is a high-quality expansion module designed to enhance the functionality of VoIP business phones. Made by the trusted brand Grandstream, this module is priced at $139.00 and is manufactured in China. It is specifically designed to be used as an extension module for IP phones, providing additional features and capabilities to improve communication within a business environment. This product is a versatile and reliable option for businesses looking to expand their IP PBX system.