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To achieve the same availability as PSTN (Public Switched Telephone Network), the VoIP (Voice over Internet Protocol) service providers deploy the HA (High Availability) mechanisms in the VoIP servers. Specifically, the VoIP server with the HA mechanism stores the VoIP user's registration record in the non-volatility memory (e.g., hard disk). After the VoIP server is restored from the failure, the...
The 3rd Generation Partnership Project (3GPP) has adopted Session Initiation Protocol (SIP) as the signaling protocol to manage multimedia sessions in the IP Multimedia Subsystem (IMS). When the User Equipment (UE) moves between the heterogeneous networks such as Universal Mobile Telecommunications System (UMTS) and Wireless Local Area Network (WLAN), SIP is used to perform the handoff for SIP-based...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.