vb.net barcode generator Descriptions of SS7 links in Software

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circuits required to complete a call. An SSP may also send a query message to a centralized database (an SCP) to determine how to route a call (such as a toll-free 1-800/888 call in North America). An SCP sends a response to the originating SSP containing the routing number(s) associated with the dialed number. An alternate routing number may be used by the SSP if the primary number is busy or the call is unanswered within a specified time. Actual call features vary from network to network and from service to service. Network traffic between signaling points may be routed via a packet switch called an STP. An STP routes each incoming message to an outgoing signaling link based on routing information contained in the SS7 message. Because it acts as a network hub, an STP provides improved utilization of the SS7 network by eliminating the need for direct links between signaling points. An STP may perform global title translation, a procedure by which the destination signaling point is determined from digits present in the signaling message (such as the dialed 800 number, the calling card number, or mobile subscriber identification number). An STP can also act as a firewall to screen SS7 messages exchanged with other networks. Because the SS7 network is critical to call processing, SCPs and STPs are usually deployed in mated-pair configurations in separate physical locations to ensure network-wide service in the event of an isolated failure. Links between signaling points are also provisioned in pairs. Traffic is shared across all links in the linkset. If one of the links fails, the signaling traffic is rerouted over another link in the linkset. The SS7 protocol provides both error correction and retransmission capabilities to enable continued service in the event of signaling point or link failures. SS7 Signaling Link Types Signaling links are logically organized by link type (A through F) according to their use in the SS7 signaling network (see Figure 2-6 and Table 2-3).
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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The Public Switched Telephone Network (PSTN)
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The Public Switched Telephone Network (PSTN)
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Figure 2-6 SS7 signaling link types (Source: Performance Technologies)
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Table 2-3 Descriptions of SS7 links
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An A (access) link connects a signaling end point (an SCP or SSP) to an STP. Only messages originating from or destined to the signaling end point are transmitted on an A link. B (bridge) links connect an STP to another STP. Typically, a quad of B links interconnect peer (or primary) STPs (the STPs from one network to the STPs of another). The distinction between a B link and a D link is rather arbitrary. For this reason, such links may be referred to as B/D links. C (cross) links connect STPs performing identical functions into a mated pair. They are used only when an STP has no other route available to a destination signaling point due to link failure(s). Note that SCPs may also be deployed in pairs to improve reliability. Unlike STPs, however, signaling links do not interconnect mated SCPs. D (diagonal) links connect a secondary (local or regional) STP pair to a primary (internetwork gateway) STP pair in a quad-link configuration. Secondary STPs within the same network are connected via a quad of D links. The distinction between a B link and a D link is rather arbitrary. For this reason, such links may be referred to as B/D links. An E (extended) link connects an SSP to an alternate STP. E links provide an alternate signaling path if an SSP s home STP cannot be reached via an A link. E links are not usually provisioned unless the benefit of a marginally higher degree of reliability justifies the added expense. An F (fully associated) link connects two signaling end points (SSPs and SCPs). F links are not usually used in networks with STPs. In networks without STPs, F links directly connect signaling points.
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