Registering an endpoint with a sliding window of controllers in a list of controllers of a survivable network
First Claim
1. A method, comprising:
- a client creating a list of a plurality of servers;
the client determining a first sub-plurality of servers with which to register, wherein the first sub-plurality of servers comprises more than one but fewer than all servers of the plurality of servers;
the client registering with the first sub-plurality of a plurality of servers;
the client obtaining services from at least one server of the first sub-plurality of servers;
in response to a first server of the first sub-plurality becoming unavailable to the client, the client determining a second sub-plurality of the plurality of servers with which to register;
the client registering with the second sub-plurality of servers, wherein at least a second server is currently included in the first sub-plurality of servers, thereby adding the second server to the second sub-plurality of servers, wherein the client is in an active-standby configuration;
the client, receiving an inbound call from the second server;
in response to the client receiving the inbound call from the second server;
the client responding to the second server with a SIP TRYING message; and
sending a SIP REGISTRATION refresh to the first server; and
in response to the first server being online, sending a SIP REDIRECT message to the second server.
23 Assignments
0 Petitions
Accused Products
Abstract
Provided are methods, devices, and systems for maintaining a SIP survivable network. A SIP endpoint maintains an ordered list of the controllers that are available to it and registers with a subset containing the first N controllers in the list, where N is a plurality, but not all, of the controllers in the list, and obtains services from one or more of the controllers of the subset. If one of the controllers of the subset becomes unavailable, the endpoint registers with the (N+1)st controller in the list, thereby adding it to the subset. If and when the one controller becomes available again, the endpoint de-registers with the (N+1)st controller, thereby removing it from the subset, and if necessary re-registers with one controller. The subset thus forms a sliding window on the list.
-
Citations
16 Claims
-
1. A method, comprising:
-
a client creating a list of a plurality of servers; the client determining a first sub-plurality of servers with which to register, wherein the first sub-plurality of servers comprises more than one but fewer than all servers of the plurality of servers; the client registering with the first sub-plurality of a plurality of servers; the client obtaining services from at least one server of the first sub-plurality of servers; in response to a first server of the first sub-plurality becoming unavailable to the client, the client determining a second sub-plurality of the plurality of servers with which to register; the client registering with the second sub-plurality of servers, wherein at least a second server is currently included in the first sub-plurality of servers, thereby adding the second server to the second sub-plurality of servers, wherein the client is in an active-standby configuration; the client, receiving an inbound call from the second server; in response to the client receiving the inbound call from the second server; the client responding to the second server with a SIP TRYING message; and sending a SIP REGISTRATION refresh to the first server; and in response to the first server being online, sending a SIP REDIRECT message to the second server. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus comprising:
-
a plurality of servers, each server including at least one controller, wherein at least one server includes a processor and memory; and a client adapted to register with a first sub-plurality of the plurality of servers, wherein the first sub-plurality comprises more than one but fewer than all servers of the plurality of servers, to obtain services from at least one server of the first sub-plurality of servers, the client being adapted to; determine that at least one server of the first sub-plurality is not available; in response to the at least one server of the first sub-plurality becoming unavailable, determine a second sub-plurality of servers with which to reregister; reregister with the second sub-plurality of the plurality of servers, wherein the second sub-plurality of servers includes at least a first server of the plurality of servers that is not currently included in the first sub-plurality of servers, wherein the first server of the plurality of servers becomes unavailable based on the client receiving a SIP 400 or 500 class response with a Retry-After header that is sent in response to a SIP OPTIONS monitoring request, and wherein monitoring, in response to the SIP OPTIONS monitoring request, is being performed on a hop-by-hop basis. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A non-transitory computer readable medium including instructions executable on a computer system for conducting a method, the instructions comprising:
-
instructions to receive, from a client, a first client registration with a first sub-plurality of a plurality of servers, wherein the first sub-plurality comprises more than one but fewer than all servers of the plurality of servers; instructions to provide a client with services from at least one server of the first sub-plurality of servers; in response to a first server of the first sub-plurality becoming unavailable to the client, instructions to receive a second client registration with a second server of the plurality that is not currently included in the first sub-plurality; and in response to receiving the second registration, instructions to add the second server to the first sub-plurality of servers, wherein the registration of the second server creates a new second sub-plurality of servers, wherein the client is in an active-standby configuration; the client, having instructions to receive an inbound call from the second server; in response to the client receiving the inbound call from the second server; the client having instructions to respond to the second server with a SIP TRYING message; and instructions to send a SIP REGISTRATION refresh to the first server; and in response to the first server being online, instructions to send a SIP REDIRECT message to the second server. - View Dependent Claims (14, 15, 16)
-
Specification