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The VIA header is a means of recording the path that a request takes to reach its destination so that all responses follow the same path. When using loose routing, the VIA header ensures that responses are received by stateful proxies in the call path. In strict routing, this is used in conjunction with the RECORD-ROUTE header.
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Structure of the SIP Protocol
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The difference is that the VIA header is used by the proxies to determine the next hop in the network for a response, while the RECORD-ROUTE is actually used to create a route list that will be used for routing all requests and responses to a device throughout the life of its registration. The VIA header is never stored as part of the registration and is only used by proxies for routing.
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VIA: SIP/2.0/UDP pchome101@aol.com:5060; branch= z9hG4bK713a2
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Warnings indicate problems in processing the session description itself. They are different than error responses, since the session itself is being processed. The WARNING header contains a text description identifying the purpose of the header as defined here: 300 Incompatible network protocol 301 Incompatible network address formats 302 Incompatible transport protocol 303 Incompatible bandwidth units 304 Media type not available 305 Incompatible media format 306 Attribute not understood 307 Session description parameter not understood 330 Multicast not available 331 Unicast not available 370 Insufficient bandwidth 399 Miscellaneous warning The definition of these warnings is outside the scope of this book. Their use is defined in RFC 3261. The preceding text values are suggested and not mandatory. Operators can define their own text values for these warnings for their own implementations.
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WARNING: 307 tekelec.com "Session parameter 'foo' not understood"
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WWW Authenticate This header is used as a challenge to an entity sending a request. The challenge is carried in the response to a request with this header. The response will contain the AUTHENTICATE header containing the proper credentials.
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Table 2-2 describes how the various header fields are used, with the exception of proxies. Proxy operations differ, depending on the header field. Table 2-2 provides an overview of proxy operations by header field.
2
Table 2.2
Proxy Operations by Header Field Proxy Operations A M D R X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
Header Field Alert info Allow Call ID Call info Contact Content length CSeq Date Error info From Max forwards Organization Priority Proxy authenticate Proxy authorization Proxy require Record route Record route (2xx, 18x) Require Route To Via Via (copied) WWW authenticate
Table 2-2 key: A = The proxy can add or concatenate the header field if it is not present. M = The proxy can modify the header field. D = The proxy can delete the header field. R = The proxy must be able to read the header field (cannot be encrypted).
SIP Identities
Resources within the SIP network are identified using either a SIP URI or a SIPS URI. There is no difference between the format of these two URIs. The SIPS URI indicates that the session between the user agent and the resource addressed in the URI is secure using encryption. The SIP RFC 3261 defines the format for SIP and SIPS URIs in the form of:
sip:user:password@host:port;uri-parameters headers
Structure of the SIP Protocol
The user field identifies a resource. A resource can be a person, or it can be a server resource. The RFC does not recommend using the password field in the URI for obvious reasons. This would require publishing the user s password in plain text, naturally raising significant security concerns. Nonetheless, it has been defined but is not implemented. There are two principles behind the use of a URI. First, one can use an IP address; however, this address should be static rather than dynamic, as the address could change when dynamic allocation is used. If a domain name is used, the receiving user agent can query the DNS to determine the IP address (common in e-mail, as an example). The URI usually takes the form of:
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