how to generate barcode in vb.net 2010 The final 200 OK response is sent to the UAC through the final proxy. in Software

Drawing Code-39 in Software The final 200 OK response is sent to the UAC through the final proxy.

The final 200 OK response is sent to the UAC through the final proxy.
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SIP/2.0 200 OK VIA: SIP/2.0/UDP raleigh.bellhead.com;branch=z9hG4bK32ad1 VIA: SIP/2.0/UDP losangeles.hometel.com;branch=z9hG4bK32de5 VIA: SIP/2.0/UDP laptop107@tcg.com;branch=z9hG4bK32de5 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com>;tag=1df789jkf MAX-FORWARDS: 68 CALL-ID: 82167534@126.18.27.0 CSeq: 1001 INVITE CONTACT: Travis Russell <sip:travis.russell@135.18.10.10>
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The CONTACT header is used for routing the responses back so that the same proxies do not have to be used.
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ACK sip:travis.russell@tcg.com SIP/2.0 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK713a2 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com>;tag=1df789jkf MAX-FORWARDS: 70 CALL-ID: 82167534@126.18.27.0 CSeq: 1001 ACK CONTACT: Deby Russell <sip:deby.russell@126.18.27.0>
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The ACK can now be routed to the UAS as shown in the following two message examples:
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ACK sip:travis.russell@tcg.com SIP/2.0 VIA: SIP/2.0/UDP raleigh.bellhead.com;branch=z9hG4bK32ad1 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK713a2 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com>;tag=1df789jkf MAX-FORWARDS: 69 CALL-ID: 82167534@126.18.27.0 CSeq: 1001 ACK CONTACT: Deby Russell <sip:deby.russell@126.18.27.0>
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This continues until the ACK is received at the UAS. Once the ACK is received by the UAS, the session can begin. The final ACK in this example would look like this example:
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ACK sip:travis.russell@tcg.com SIP/2.0 VIA: SIP/2.0/UDP losangeles.hometel.com;branch=z9hG4bK32de5 VIA: SIP/2.0/UDP raleigh.bellhead.com;branch=z9hG4bK32ad1 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK713a2 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com>;tag=1df789jkf MAX-FORWARDS: 68 CALL-ID: 82167534@126.18.27.0 CSeq: 1001 ACK CONTACT: Deby Russell <sip:deby.russell@126.18.27.0>
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The session is then terminated using the BYE method as shown. Notice that the request-URI contains the IP address of the recipient. This comes from the CONTACT header and allows the message to be sent directly without having to use the proxies, even though in our example we are still routing to the proxies.
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BYE sip:travis.russell@135.18.10.10 SIP/2.0 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK713a2 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com>;tag=1df789jkf MAX-FORWARDS: 70 CALL-ID: 82167534@126.18.27.0 CSeq: 1001 BYE CONTACT: Deby Russell <sip:deby.russell@126.18.27.0> BYE sip:travis.russell@135.18.10.10 SIP/2.0 VIA: SIP/2.0/UDP raleigh.bellhead.com;branch=z9hG4bK32ad1 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK713a2 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com>;tag=1df789jkf MAX-FORWARDS: 69 CALL-ID: 82167534@126.18.27.0 CSeq: 1001 BYE CONTACT: Deby Russell <sip:deby.russell@126.18.27.0> BYE sip:travis.russell@135.18.10.10 SIP/2.0 VIA: SIP/2.0/UDP losangeles.hometel.com;branch=z9hG4bK32de5 VIA: SIP/2.0/UDP raleigh.bellhead.com;branch=z9hG4bK32ad1 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK713a2 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com>;tag=1df789jkf MAX-FORWARDS: 68 CALL-ID: 82167534@126.18.27.0 CSeq: 1001 BYE CONTACT: Deby Russell <sip:deby.russell@126.18.27.0>
5
Note that the BYE message contains the tags so that the receiving UA can calculate the dialog ID and determine which dialog/session is to be terminated. Without this the UA will not be able to determine which session it applies to.
Strict Routing
Strict routing can cause issues with congestion over some routes, and it certainly creates imbalance in the load of some parts of the network. However, if this can be overcome (by the configuration of the network and additional bandwidth, for example), then there are many advantages to the use of strict routing. Security is certainly at the top of the list of advantages, but we will discuss that in 7. Strict routing relies on a route list for each subscriber. The route list is created during registration. As the REGISTER message is routed through the network, each proxy will append the message with its own address using the RECORD-ROUTE header. The headers are added to the message in order so that the path can be established. The route recorded when registering a location is stored at the registrar and becomes a part of the subscriber s registration record. This route list is then shared with any stateful proxy. The route is shared through the use of ROUTE headers in the messages. The ROUTE messages are added to each request either by the UAC or by a stateful proxy. For example, some stateful proxies (such as in the IMS) will save the RECORDROUTE headers for a subscriber when they register, and then use these as a route list for the subscriber for the lifetime of the registration. The route list is then erased and replaced with a new route list when the subscriber registers a new location. Likewise, when a request is sent to a UAS, the UAS saves the RECORD-ROUTE headers as a route list for the subscriber for the duration of the session. There is no need for the UAS to store these addresses once the session is released. When the UAC has received all of the responses for a request, it then converts the RECORD-ROUTE headers into a RECORD header (or headers) for subsequent requests. For example, the ACK would use the RECORD header. Previous Figure 5.3 provides an example of routing, with examples of what each of the messages would look like with strict routing shown next. Provisional responses have been excluded for brevity. The examples are of a dialog between a UAC and a UAS, with proxies in between. The first leg of the call from the UAC to the first proxy would look like this:
INVITE sip:raleigh.bellhead.com sip/2.0 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK74gh5 FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com> MAX-FORWARDS: 70 CALL-ID: 82167534@126.18.27.0 CSeq: 10001 INVITE CONTACT: Deby Russell <sip:deby@126.18.27.0> CONTENT-TYPE: application/sdp CONTENT LENGTH: 154
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