vb.net qr code Security in a SIP Network in Software

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Security in a SIP Network
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entity then returns a response containing a list of methods it supports. If the responding entity is the UAS, it would return the SECURITY-SERVER header contained in its response. The SECURITY-SERVER header would then list the methods supported. Possible values include TLS, DIGEST, IPSEC-IKE, and IPSEC-MAN. The receiving node then returns a request along with the SECURITY-VERIFY header containing the relevant security keys. A UAC uses the SECURITY-CLIENT header to send a list of support encryption methods to upstream nodes.
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Authentication and Authorization
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One method of authentication is through the use of certificates. This is implemented in many Web sites today. When you set your browser to check for certificates, and you access a network resource (such as a Microsoft Web site to purchase software), your browser will ask the Web site for its certificate. These are public certificates that are advertised to trusted communities so that they are able to access the sites. This works by providing the browsers with the key for the trusted Web site. The key is used to determine if the certificate is valid or not. Only the key holder and the application accessing the site know the key. The key can also be provided when a subscriber signs up for a new service, such as online banking. The online banking institution would exchange the key with the subscriber upon signup for the service. The subscriber and the online banking service then are part of a trusted domain. The certificate is associated with a specific URI using a cryptic identity. Only the receivers with the proper key can decrypt the identity and therefore authenticate the site. This concept is not perfect by any means, but it is one way of at least making it more difficult to steal services from networks. Anytime a service is being provided, and a subscriber sends a request that is of questionable origin (has not been authenticated before), the application server should reply with a 401 Unauthorized response, forcing the UAC to send the proper credentials prior to accessing the service. When the UAC receives this response, it should resend the INVITE again but include the AUTHENTICATION header in the message. The CALL-ID should be the same as the original INVITE so that the server knows that this is a second attempt to access services and it is in response to a previous challenge. The AUTHENTICATION header provides the application server with the necessary credentials so that the server can provide the subscriber with the requested services. This should be practiced in all networks to prevent unauthorized access to services. Authentication can be applied to application servers as well. As when using a certificate, each application server would be configured with a unique encryption key. Only authorized UAs would receive the proper key. When they receive a request from an application server, they would then be able to challenge the application server (the same process used against the UAC in reverse).
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This would help prevent rogue application servers from sending requests to unsuspecting subscribers, and it would allow devices to challenge the servers they access. Since it is encrypted, it should be more secure than certificates. When the MESSAGE method is used for forwarding text messaging, application server and proxy authentication should be enforced to prevent spoofing and spamming. As mentioned in the earlier section Encryption, the MESSAGE method is used to deliver a text message. The text message is delivered in clear text within the SIP message body. This makes it vulnerable to attacks unless encryption and authentication are enforced. A DATE header should also be enforced to ensure that there is a timestamp for every message. Any time a MESSAGE is received with a timestamp indicating it is more than several minutes old, the message should be rejected by sending the response 400 INCORRECT DATA OR TIME. The exception is when a store and forward function is used to deliver these messages. When a store and forward server is being used, the message will of course always be more than a few minutes old, since it was delivered to be stored and forwarded when the subscriber became available.
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