Methods and apparatus to route emergency communication sessions
Methods and apparatus to route emergency communication sessions are disclosed. An example method involves querying a gateway node cache in response to a first broadcast probe received at a node of a wireless Internet-based network. When the gateway node cache identifies a first gateway node, a first response is selectively sent to nodes that participated in a search flood associated with the first broadcast probe.
1. A method comprising:
querying a gateway node cache in response to a first broadcast probe received at a first node of a wireless Internet-based network;
when the gateway node cache identifies a first gateway node, selectively sending a first response to nodes that participated in a search flood associated with the first broadcast probe;
determining whether the first node is capable to act as a second gateway node; and
broadcasting a second response when the gateway node cache does not identify the first gateway node and the first node is capable to act as the second gateway node.
2. A method as defined in claim 1 , wherein the second response indicates a communication service supported by the first node.
3. A method comprising:
querying a gateway node cache in response to a first broadcast probe received at a first node of a wireless Internet-based network;
when the gateway node cache identifies a first gateway node, selectively sending a first response to nodes that participated in a search flood associated with the first broadcast probe;
receiving a report packet comprising a next-hop media access control address and a gateway node identifier;
adding the media access control address and the gateway node identifier to the gateway node cache; and
broadcasting a second report packet comprising a second media access control address of the first node and the gateway node identifier.
4. A method as defined in claim 3 , wherein a gateway node comprising the gateway node cache is communicatively coupled to the wireless Internet-based network and at least one of a public switched telephone network or a public land mobile network.
5. A machine accessible storage device comprising instructions that, when executed, cause a machine to perform a method comprising:
querying a gateway node cache in response to a first broadcast probe received at a first node of a wireless Internet-based network;
when the gateway node cache identifies a first gateway node, selectively sending a first response to nodes that participated in a search flood associated with the first broadcast probe;
determining whether the first node is capable to act as a second gateway node; and
broadcasting a second response when the gateway node cache does not identify the first gateway node and the first node is capable to act as the second gateway node.
6. A machine accessible storage device as defined in claim 5 , wherein the second response indicates a communication service supported by the node.
7. A machine accessible storage device comprising instructions that, when executed, cause a machine to perform a method comprising:
querying a gateway node cache in response to a first broadcast probe received at a first node of a wireless Internet-based network;
when the gateway node cache identifies a first gateway node, selectively sending a first response to nodes that participated in a search flood associated with the first broadcast probe;
receiving a report packet comprising a next-hop media access control address and a gateway node identifier;
adding the media access control address and the gateway node identifier to the gateway node cache; and
broadcasting a second report packet comprising a second media access control address of the first node and the gateway node identifier.
8. A machine accessible storage device as defined in claim 7 , wherein a gateway node comprising the gateway node cache is communicatively coupled to the wireless Internet-based network and at least one of a public switched telephone network or a public land mobile network.
9. A method comprising:
receiving a call setup request from a first node of an Internet-based network at a second node of the Internet-based network;
comparing a first media access control address of the call setup request with a second media access control address of the second node;
querying a cache to obtain a third media access control address when the first media access control address matches the second media access control address; and
transmitting, from the second node, a second call setup request to the third media access control address.
10. A method as defined in claim 9 , further comprising discarding the first call setup request when the first media access control address does not match the second media access control address.
11. A method as defined in claim 9 , further comprising processing the call setup request when the first media access control address matches the second media access control address and the second node is a gateway node.
12. A method as defined in claim 11 , wherein the gateway node is to facilitate a communication session between the first node and the emergency call center.
13. A method as defined in claim 9 , wherein the call setup request is directed to an emergency call center.
14. A machine accessible storage device comprising instructions that, when executed, cause a machine to perform a method comprising:
comparing a first media access control address of a call setup request received from a first node of an Internet-based network with a second media access control address of a second node of the Internet-based network;
querying a cache to obtain a third media access control address when the first media access control address matches the second media access control address; and
transmitting, from the second node, a second call setup request to the third media access control address.
15. A machine accessible storage device as defined in claim 14 , wherein the method further comprises discarding the first call setup request when the first media access control address does not match the second media access control address.
16. A machine accessible storage device as defined in claim 14 , wherein the method further comprises processing the call setup request when the first media access control address matches the second media access control address and the second node is a gateway node.
17. A machine accessible storage device as defined in claim 16 , wherein the gateway node is to facilitate a communication session between the first node and the emergency call center.
18. A machine accessible storage device as defined in claim 14 , wherein the call setup request is directed to an emergency call center.