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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Now that we have discussed the creation of a request, let s look at how a UAS responds to a request.
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There are basically six types of responses as you saw in 3; provisional, successful, redirection, client error, server error, and global error. The use of numbering simplifies the use of these responses and allows vendors to use the numbering scheme within their applications to make applications more user friendly. When a request is sent by the UAC, a timer is sent at the UAC to ensure a response is received within a given time. The default for this timer is typically three seconds. If there is no response within three seconds, the UAC will retransmit the request, and the timer is reset. This could pose a problem in large networks, where latency may cause additional delays in the routing or requests. To prevent large volumes of requests from clogging the network, proxies use provisional responses to stop the expiration of the response timer in the UAC. The provisional response extends the time for a response, and it continues to be sent until the final response is received by the UAC. The proxy maintains the state of the request/response and ceases the transmission of provisional responses when it receives the final response for forwarding to the UAC. The provisional response does not establish a session or a dialog. It simply prevents retransmission of the request by confirming that the request was received by the proxy and is being processed. When the request is forwarded to the next proxy, a timer in the first proxy is set in the same fashion as in the UAC. The first proxy will then wait three seconds before retransmitting the request. The second proxy will therefore send a provisional response to the first proxy. The UAS can send as many provisional responses as it likes, as long as the CALL-ID correlates to the initial request. If there is no response from the UAS, and the response timer in the UAC expires, the UAC will send response 408 Request Timeout toward the UAS. Each of the proxies in the path will also process the response and consider the request as canceled. This continues throughout the network, until the final response is received by each of the network entities and the UAC. One could then consider SIP networks implemented in this fashion as point-to-point networks, as each node within the network manages the connection to the next hop in the call path. When the UAS receives the request, it can respond with a successful response or an error response. It can also send a provisional response to delay the retransmission of the request. The remote target URI is replaced with the URI found in the CONTACT header of the 2xx response if loose routing is implemented. If strict routing is used, then the response is sent in the same path as the request. You ll learn more about routing in the section SIP Routing later in this chapter. When the UAS receives the request, it will compute the dialog ID to determine if this is for a dialog already in progress. If the request is for a dialog already in progress, then the request is treated as a mid-dialog request. If the UAS does not recognize the dialog ID, it assumes that another UAS has failed and the receiving UAS is providing backup to the primary (intended) server.
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This could have been caused by a crash or reboot of the intended UAS. For this reason the UAS will not necessarily reject the request. The first phase described here is session negotiation. The UAS then examines the SDP to determine if it is able to support the requested session. If the UAS determines that it cannot support the session, it returns a response of 488 NOT ACCEPTABLE HERE. This indicates that the UAS is unable to support the media identified in the SDP. The UAS is not rejecting the session request in its entirety, but rather it is declining to support for the specified resource. If the UAS were to reject the entire session for other reasons, it would send the response 606 NOT ACCEPTABLE. The UAC can then change the required resources for the session or abandon the request altogether by sending the BYE message. Changing the required resources would require sending a subsequent INVITE with new requirements. So far we have described autonomous responses those sent by the UAC and UAS functions without user intervention. The UAS also has the option of sending an alert to the end user of the device to allow the user to accept or reject a session request. This of course is managed by the application receiving the request. For example a user may receive a request to join an instant message (IM). The application receiving the INVITE would send a provisional response (such as 180 RINGING) to the UAC while sending an alert and display it to the user. The user must then determine if he or she wants to accept the IM or reject it. If the user decides to accept the IM, the UAS function within their device would then return a 200 OK response to the UAC. However, if the user decides to reject the request, the UAS would return the response 603 DECLINE. The entire sequence of messages might look something like this example:
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INVITE sip:travis.russell@tcg.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 travis.russell@tcg.com MAX FORWARDS: 70 CALL-ID: 82167534@126.18.27.0 CSeq: 1 INVITE CONTACT: Deby Russell <sip:deby@126.18.27.0> CONTENT-TYPE: application/SDP CONTENT-LENGTH: 154
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In the preceding message, the request is sent to the user. Notice that a dialog has not yet been established (the TO TAG value has not been appended yet).
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SIP/2.0 200 OK 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>;tag=1df789jkf MAX FORWARDS: 70 CALL-ID: 82167534@126.18.27.0 CSeq: 1 INVITE
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