how to generate barcode in vb.net 2010 Establishing a Session in SIP in Software

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Establishing a Session in SIP
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The first proxy then appends the message with its own address for recording the route.
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INVITE sip:losangeles.hometel.com sip/2.0 VIA: SIP/2.0/UDP raleigh.bellhead.com;branch=z9hG4bK32ad1 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK74gh5 RECORD-ROUTE: <sip:raleigh.bellhead.com> FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com> MAX-FORWARDS: 69 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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The first proxy then forwards the request on to the next hop in the network, where the second proxy address is added to the request.
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INVITE sip:travis.russell@tcg.com sip/2.0 VIA: SIP/2.0/UDP losangeles.hometel.com;branch=z9hG4bK42al3 VIA: SIP/2.0/UDP raleigh.bellhead.com;branch=z9hG4bK32ad1 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK74gh5 RECORD-ROUTE: <sip:losangeles.hometel.com> RECORD-ROUTE: <sip:raleigh.bellhead.com> FROM: Deby Russell <sip:deby.russell@aol.com>;tag=9hz34567sl TO: Travis Russell <sip:travis.russell@tcg.com> MAX-FORWARDS: 68 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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Notice also that the MAX-FORWARDS header is decremented each time the message is forwarded by a proxy. Also note that the TO header still does not have the TAG field appended; therefore, a dialog has not been established. Once the request reaches the UAS, a response is generated and returned back to the UAC. The response sequence might look something like the following examples:
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SIP/2.0 200 OK 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: 70 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 UAS in this message has appended the TO header with its own TAG value and has changed the CONTACT header to reflect the address of the recipient.
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The first proxy in the reverse direction will then append the message with its address in the same fashion you saw in the forward direction.
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SIP/2.0 200 OK VIA: SIP/2.0/UDP losangeles.hometel.com;branch=z9hG4bK32de5 VIA: SIP/2.0/UDP laptop107@tcg.com;branch=z9hG4bK32de5 RECORD-ROUTE: <sip:losangeles.hometel.com> 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 INVITE CONTACT: Travis Russell <sip:travis.russell@135.18.10.10>
The first proxy in the reverse direction then forwards the response to the second proxy in the reverse direction, which also adds its address in the RECORD-ROUTE header.
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 RECORD-ROUTE: <sip:raleigh.bellhead.com> RECORD-ROUTE: <sip:losangeles.hometel.com> 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>
The UAC now receives the responses from its request and processes the response. This includes the recording of the route used with each of the requests. This now becomes the route list for the ACK sent by the UAC as shown here:
ACK sip:raleigh.bellhead.com SIP/2.0 VIA: SIP/2.0/UDP pchome101@aol.com:5060;branch=z9hG4bK713a2 ROUTE: <sip:raleigh.bellhead.com> ROUTE: <sip:losangeles.hometel.com> 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>
The ACK is then sent through the network to the next proxy, which removes its address from the ROUTE header and forwards the message. It also places the address of the next hop into the request-URI.
ACK sip:losangeles.hometel.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
Establishing a Session in SIP
ROUTE: <sip:losangeles.hometel.com> 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>
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:
ACK sip:laptop107@tekelec.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>
There are a number of reasons for using the RECORD-ROUTE and ROUTE headers (and therefore strict routing). There are many services that need to know when a session is released. For example, a presence server needs to know that a user has finished a phone call and is now available for another call. The only way this is possible is if the proxies in the network are able to track each and every request and response for a session, and report via event notification to the presence server that a session has ended. Strict routing also helps enable lawful intercept by routing all requests/responses for a session through the same proxies. This makes it easier to collect all call data for a particular session and correlate those messages for the creation of xDRs and reporting tools. When routing a SIP request, the request-URI will identify the next hop in the network, employing the route list established for a particular subscriber. It should be noted here that the TO and FROM headers are never used for routing purposes. In fact, the network ignores these headers completely. They are only for the consumption by applications and user displays (such as calling name displays).
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