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Next is an example of message sequence between a subscriber device and a voicemail platform (as an example).
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SUBSCRIBE sip:travis.russell@tcg.com SIP/2.0 TO: <sip:travis.russell@tcg.com> FROM: <sip:travis.russell@tcg.com>;tag=31987 DATE: Fri, 16 Nov 2007 02:45:04 GMT CALL-ID: 763472@travis-cell. com CSeq: 1 SUBSCRIBE CONTACT: <sip:travis.russell@tcg.com> EVENT: message-summary EXPIRES: 86400 ACCEPT: application/simple-message-summary CONTENT-LENGTH: 0
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In this example, the EVENT header identifies the event notification package this is applicable to, and in the ACCEPT header the application is identified. Notice also the EXPIRES header. This is a simple example and may or may not be different in actual practice, but the intent is to provide a basic example for reference. This message is followed by a 200 OK response, but no ACK is required. Whenever the voice mailbox of the subscriber changes state, the voicemail system sends the NOTIFY message to notify the subscriber of a message waiting. There are a number of ways the device then acts upon this message, but it is dependent on the device to determine how to notify the subscriber. The NOTIFY provides notification in the form of plain text. The device must be able to read this plain text then but does not necessarily display the contents of the NOTIFY. Here is an example of a typical NOTIFY message:
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NOTIFY sip:travis.russell@tcg.com SIP/2.0 TO: <sip:travis.russell@tcg.com> FROM: <sip:travis.russell@tcg.com>;tag=31987 DATE: Fri, 16 Nov 2007 02:45:04 GMT CALL-ID: 763472@travis-cell. com CSeq: 20 NOTIFY CONTACT: <sip:travis.russell@tcg.com> EVENT: message-summary SUBSCRIPTION-STATE: active CONTENT-TYPE: application/simple-message-summary CONTENT-LENGTH: 99 MESSAGES-WAITING: yes MESSAGE-ACCOUNT: sip:travis.russell@tcg.com VOICE-MESSAGE: 5/2 (1/0)
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In this example, the bottom headers provide the device with the message indication. The MESSAGES-WAITING header identifies that there is a message waiting for the specified subscriber account. The MESSAGE-ACCOUNT identifies the message account that this message is for, and the VOICE-MESSAGE header indicates the number of new/old messages (in that order) and the number of new and old urgent messages. In this example, my mailbox is holding five new messages, two old messages, one new urgent message, and no old urgent messages.
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Again, the NOTIFY message does not identify how to notify the subscriber of these messages. These headers are intended to be interpreted by the device and, depending on the type of device, use whatever method is available. This could mean illuminating a light on the device, or sending a message to the subscriber via text messages. The following RFCs define the various aspects of event notification:
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Message Summary (RFC 3842) Conference (RFC 4575) Presence (RFC 3856) Reg (RFC 3680) Refer (RFC 3515)
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As mentioned at the beginning of this chapter, it is unlikely that service providers will wake up one morning and simply switch off their switched network and turn on the IP network. The switched network consists of many investments that cannot be simply thrown away. It will take many years to migrate the switched portions of the network to an IP network. Most service providers have already begun the migration. The typical approach is to begin by deploying an IP backbone for use in transporting packetized voice and data. This IP backbone then allows operators to begin migrating specific portions of their network as they need. In today s traditional telecom networks, the actual setup and teardown of a voice call takes place through a dialog between two switches. A circuit connection is established between the two switches, and through subsequent switches until a path has been established all the way to the destination. Each switch in the path establishes a dialog and exchanges information regarding the voice call, much as we described in the preceding sections. The main difference is that the dialog uses a different protocol, Signaling System #7 (SS7), and the dialog is point-to-point. In other words, SS7 is used to connect each individual leg of the call. This means you will see multiple groups of messages for a single call. In SS7 terminology, the first message that is used to initiate a circuit connection is the initial address message (IAM). This is somewhat analogous with the SIP INVITE. The SS7 IAM is sent between each individual switch in the voice path, using digital channels dedicated for the purpose of signaling. The voice transmission itself can be sent on accompanying digital channels, but this is not required. The signaling provides the next switch in the path information needed to establish a connection and route to the next hop in the route. Figure 4.2 shows the typical call flow for an SS7 network. Note that the IAM is sent to the next switch in the route referencing the specific circuit to be used between the two switches. A new IAM is then created using much of the same information as the previous IAM, but with a new circuit identification. The IAM then is used to establish a connection point in the route, and not every connection point end to end.
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