... , 1 relay FXO port USB: 1 USB 2.0 port Packaging include:1.Seller refurbished Router SRP521W *1 2.12V AC ... -quality voice, data, security, and wireless services.Integrated voice ports powered by an industry-leading voice Session Initiation Protocol (SIP) stack to ... support for TR-069 and XML, that reduces operating expenses by enabling near zero touch deployments, eliminating the need for highly ...