qr code c# example Daniel<sip:Collins@workcom> sip:Serverworkcom in Visual Studio .NET

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Boss<Manager@pc1homenet>
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Figure 5-11 Application of a redirect server
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INVITE sip:manager@workcom SIP/20 Via: SIP/20/UDP station1workcom; branch=z9hG4bK123 Max-Forwards: 70 From: Daniel<sip:Collins@workcom>; tag=44551 Contact: sip:Collins@station1workcom To: Boss<sip:Manager@workcom> Call-ID: 123456@station1workcom CSeq: 1 INVITE Subject: Vacation Content-Length: xxx Content-Type: application/sdp Content-Disposition: session (message body)
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SIP/20 302 Moved Temporarily Via: SIP/20/UDP station1workcom; branch=z9hG4bK123 From: Daniel<sip:Collins@workcom>; tag=44551 To: Boss<sip:Manager@workcom> Call-ID: 123456@station1workcom CSeq: 1 INVITE Contact: sip:Manager@pc1homenet
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ACK sip:manager@workcom SIP/20 Via: SIP/20/UDP station1workcom; branch=z9hG4bK123 Max-Forwards: 70 From: Daniel<sip:Collins@workcom>; tag=44551 To: Boss<sip:Manager@workcom> Call-ID: 123456@station1workcom CSeq: 1 ACK
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INVITE sip:manager@pc1homenet SIP/20 Via: SIP/20/UDP station1workcom; branch=z9hG4bK124 Max-Forwards: 70 From: Daniel<sip:Collins@workcom>; tag=44551 Contact: sip:Collins@station1workcom To: Boss<sip:Manager@workcom> Call-ID: 123456@station1workcom CSeq: 2 INVITE Subject: Vacation Content-Length: xxx Content-Type: application/sdp Content-Disposition: session (message body)
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A proxy server sits between a user-agent client and the far-end user-agent server A proxy accepts requests from the client and forwards them
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
The Session Initiation Protocol (SIP)
The Session Initiation Protocol (SIP)
onwards, perhaps after some translation Numerous proxies can reside in a chain between the caller and callee The most common scenario will have at least two proxies: one at the caller end and one at the callee end Let s assume that Boss (at home) calls Collins (at work) If we assume that the call will pass via a proxy, as might be expected, then the sequence of messages could appear as in Figure 5-12 To avoid clutter, the Subject and Message Body headers have been omitted Those headers would normally be included The proxy receives the INVITE and forwards it onwards In doing so, the proxy can change the Request-URI The proxy will do so if it knows that the Request-URI should be mapped to a different address For example, if a proxy is also a registrar and is aware of a Contact address for a given address of record, then the proxy will change the Request-URI of an INVITE to the appropriate contact address In the example of Figure 5-12, the proxy is aware that the address sip:Collins@workcom should be mapped to sip:Collins@station1workcom, and it uses sip:Collins@station1workcom as the Request-URI when it forwards the request In many cases, however, there might be several proxies in the chain from caller to callee It is likely that only the last proxy in the chain is aware of where a user has logged in, and it is only that proxy that would map the Request-URI to a different value The other proxies in the chain would simply use the domain part of the received Request-URI as input to a location function (such as a Domain Name System [DNS]) to determine the next hop in the path from caller to callee, but they would not change the value of the Request-URI In Figure 5-12, the proxy returns a provisional response of 100 (trying) to the initial INVITE, and the proxy does this in parallel with forwarding the INVITE towards the called party The requirement to issue the provisional 100 response is mandatory in some cases and optional in others In general, it is a good idea to provide the provisional response in all cases Of major importance for proxy servers is the Via: header field The Via: header is used to indicate the path taken by a request so far When a request is generated, the originating client inserts its own address in a Via: header field Each proxy along the way also inserts its address in a new Via: header field, placed in front of any existing Via: headers, as can be seen in Figure 5-12 Therefore, the collection of Via: headers provides a map of the path taken through the network by a given request When a proxy receives a request, it checks to see if its own address is already included in one of the Via: header fields If so, then the request has already passed through the proxy and a loop condition might exist A loop condition will exist if those header fields that affect the routing of the request (most notably the Request-URI) are the same as a request that has
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
The Session Initiation Protocol (SIP)
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