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Hacking VoIP by Himanshu Dwivedi

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H.323 Security Attacks

H.323 endpoints use H.225's Registration Admission Status (RAS) for many security items, including authentication and registration functions. RAS services allow endpoints, gatekeepers, and gateways to chatter with one another in order to ensure that each device is registered, can talk appropriately, and is still alive. Items like registration connectivity, bandwidth changes, active/non-active status, and un-registrations between endpoint/gatekeepers occur with the use of RAS.

In terms of security, RAS handles key components for H.323 networks. For example, when an H.323 endpoint is connected to the network, it must use RAS's registration function to speak in the VoIP environment. If the endpoint is unable to register or cannot ...

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