NAT traversal in VoIP communication system
US9998424B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2016 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Oct 17, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/51
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods, systems, and apparatuses are provided for VoIP communication with endpoint devices via a network address translator (NAT). A plurality of proxy servers is configured to relay communications through mapped paths of the NAT during operations including VoIP sessions through or with the plurality of endpoint devices and during other operations not involving VoIP sessions through or with the plurality of endpoint devices. The mapped paths are susceptible to being unmapped by the NAT if the mapped path is unused for a threshold duration of time. The proxy servers maintain the mapped paths through the NAT by prompting the endpoint devices to communicate data to the plurality of proxy servers. A call control server uses a selection algorithm to select a particular one of the proxy servers to be used for routing communication of a VoIP session between endpoint devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.