By Travis Russell
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Additional info for Session Initiation Protocol (SIP)
The requirements for supporting the session (such as the type of media, how it is encoded, and what other methods must be supported) are included as part of the request. There are requests that are specific to certain types of sessions. A good example of this is the MESSAGE method, which carries a text message. No session and dialog are needed, since the contents are provided in the message body. The recipient can choose to accept the message or not through a response. Responses Responses are sent by a SIP server to a client in response to a request.
The DNS must be queried by the proxies in the network when they receive a message to be routed and only the URI is provided. To prevent overloading the DNS, the function is distributed throughout the network. This prevents the possibility of too many requests flooding the DNS and causing it to fail, thereby denying service to all those whose address is stored in the DNS. In fact the DNS architecture is quite sophisticated. There are many different levels of DNS, enabling a tiered approach to finding information.
Com could be sent to the DNS maintained by my ISP. com DNS, which could then resolve the address. This is an oversimplified example of how the DNS works and is not meant to be an exhaustive study of DNS servers, since that is outside the scope of this book. There are plenty of tutorials on the Internet that provide exhaustive information about the workings of the DNS. Electronic Numbering (ENUM) When VoIP came along, the need to support telephone numbers challenged the DNS. As discussed previously, the DNS resolves names into IP addresses.
Session Initiation Protocol (SIP) by Travis Russell