Patent ID: 9749362
Date: 2017-08-29
CPC Classifications: H04L

Claim:
1. A method for obtaining an address of a session initiation protocol (SIP) registration server, the method applied in an enterprise or organization comprising a branch office and a central site, comprising: receiving, by a branch device comprising a processor in the branch office, a domain name system (DNS), resource record for specifying the location of service (SRV) query request sent by a branch terminal in the branch office during the branch terminal startup; forwarding, by the branch device, the DNS SRV query request to a DNS server in the central site, wherein the branch device is a SIP local survivable registration server providing registration service to the branch office when SIP registration server in the central site is not available and a DNS proxy responsible for implementing information transfer between the branch terminal and the DNS server; obtaining, by the branch device, a DNS SRV response message returned by the DNS server in response to the DNS SRV query request;