Charter Communications Operating, LLC

Robert Dianda

Ashutosh Kumar Sinha

Methods and systems for enhanced domain name system (DNS) response caching are described. An enhanced DNS response caching method includes receiving a connection request for a fully qualified domain name (FQDN). A DNS client checks a local cache for a cached resolved domain name corresponding to the FQDN and sendsa query to obtain or refresh the cached resolved domain name if a Time to Live parameter is expired or about to expire. In response to receiving a negative response or no response for the query, the DNS client determines whether an enhanced DNS response caching parameter is enabled. If the enhanced DNS response caching parameter is enabled, the DNS client sends an expired cached resolved domain name to process the connection request.

Enhanced domain name system response caching

Various embodiments include computing devices and methods for updating a resource address. A processor of a computing device may receive a request for a resource address from a second computing device. The processor may send to the second computing device the resource address and a time-to-live for the resource address. The processor may determine that the resource address has changed within the time-to-live. The processor may send the changed resource address to the second computing device.

Systems and methods for updating a resource address

Systems, methods, and devices of the various embodiments disclosed herein may enable automatic retry of Internet Protocol (IP) Multimedia Subsystem (IMS) Based Session Initiation Protocol (SIP) Call Setup. Various embodiments may enable a server in an IMS based telecommunication network, such as a proxy-call session control function (P-CSCF) server, interrogating/serving-call session control function (I/S-CSCF) server, telephony application server (TAS), etc., to reattempt SIP call setup. In various embodiments, in response to receiving a SIP error response including a retry-after header, the server may wait a period of time before sending a new SIP invite message.

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Colorado Springs, CO, United States of America

Robert Dianda