T. Russell, Signaling System #7. McGraw-Hill, 2nd ed., 1998.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....potential of tying up all the voice ports and perhaps even saturating the signaling link. These types of attacks can be countered by using different types of throttles available in the SS7 protocol. One potential approach could be to have the M S gateway send out Transfer Controlled (TFC) messages [12] when all the voice ports are occupied. These messages will cause the upstream Signaling Transfer Point (STP) 12] to throttle call setup requests sent to the M S gateway. Additionally, application level call gapping methods can be designed to mitigate these types of DoS attacks. B. ....

....be countered by using different types of throttles available in the SS7 protocol. One potential approach could be to have the M S gateway send out Transfer Controlled (TFC) messages [12] when all the voice ports are occupied. These messages will cause the upstream Signaling Transfer Point (STP) [12] to throttle call setup requests sent to the M S gateway. Additionally, application level call gapping methods can be designed to mitigate these types of DoS attacks. B. Eavesdropping Within the STEM architecture there are two information flows susceptible to eavesdropping: the control flow and ....

Travis Russell, Signaling System 7, McGraw-Hill, New York, NY, 3rd edition, 2000.

....a plain text protocol called Session Initiation Protocol (SIP) 23] based on the structure of the Hypertext Transfer Protocol (HTTP) 18] The International Telecommunication Union (ITU) developed H. 323 [31] which inherited the structure and basic functionality from the Signaling System 7 (SS7) [47] protocol used within the PSTN. The two protocols are not directly compatible but provide comparable features. H.323 was developed first and currently has a larger piece of the market share but recently SIP has been gaining momentum [58] As with any new technology there are many different issues ....

....include provisions for a Media Signal Gateway (MSG) but it is needed to connect the enterprise to the PSTN. The translation between the SIP or H. 323 signaling facilities and the Signaling System 7 (SS7) used to control PSTN calls are beyond the scope of this work and readers should refer to [47, 48, 65]. The user agents specifications state that both client and server capabilities must be included in an end terminal. This is required because the terminal must take on the role of a client when initiating a call and that of a server when receiving a call. 11 Message Routing The design of SIP ....

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Travis Russell. Signaling System 7. McGraw-Hill, New York, NY, 3rd edition, 2000.

....to its final destination. The Media Signal Gateway is an application level proxy to connect the IP network to the PSTN. The MSG is composed of voice ports bound to voice trunks on the PSTN side and LAN connectivity in the enterprise side. Additionally, it may contain a Signaling System 7 (SS7) [24] link to a Signal Transfer Point (STP) The MSG provides control and data message conversion between the two networks. An user initiating an calls from within the enterprise network to a PSTN end terminal, provides the MSG with authentication credentials (which the MSG verifies) before a call can ....

....accepts the call and the message is relayed through the gateway back to the calling terminal. When either terminal terminates the call, the appropriate tear down messages are exchanged, the circuits are released, and the voice port in the gateway is freed. Details of SS7 routing can be found in [24] and is beyond the scope of this paper. End Termial Terminating Local Exchange Media Signal End Terminal INVITE (1) IAM (3) REL BUSY (4) Trying (2) RLC (5) ACK (7) Busy Here (6) Figure 3. Message flow for a Net to PSTN call with called party unavailable. 3.2. Net to PSTN Call ....

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T. Russell. Signaling System 7. McGraw-Hill, New York, NY, 3rd edition, 2000.

....to individual parties of the call, may be effected by different underlying communications protocols over different types of networks. Thus, one leg of the call may be effected using the H. 323 protocol [4] another via SIP [5] and a third via traditional PSTN signaling protocols like ISUP [6]. Several call models and associated APIs have been developed in the past, including AIN [7] Java Telephony API (JTAPI) 8, 2] and Telephony API (TAPI) 9] While there are important differences among these ca ll mode l s, reflecting the architecture or appl ication for which they were ....

T. Russell, Signaling System 7 , McGraw-Hill, 1998.

....to individual parties of the call, may be affected by different underlying communications protocols over different types of networks. Thus one leg of the call may be affected using the H. 323 protocol [4] another via SIP [5] and a third via traditional PSTN signaling protocols like ISUP [6]. JCC can be used to set up multimedia sessions, provided they can be modeled using the abstractions provided by the JCC API. Note however, that JCC is not intended to provide fullfledged control of multimedia streams, such as synchronization facilities, control of different substreams, etc; these ....

T. Russell, Signaling System 7, 500 pp., McGraw-Hill, 1998.

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T. Russell, Signaling System #7. McGraw-Hill, 2nd ed., 1998.

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T. Russell, Signaling System 7, 500 pp., McGraw-Hill, 1998.

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T. Russell. Signaling System 7. McGraw-Hill, 1995.

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