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Can You Hear Me Now?! It Must Be BGP
"... Industry observers expect VoIP to eventually replace most of the existing land-line telephone connections. Currently however, quality and reliability concerns largely limit VoIP usage to either personal calls on cross-domain services such as Skype and Vonage, or to single-domain services such as tru ..."
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Industry observers expect VoIP to eventually replace most of the existing land-line telephone connections. Currently however, quality and reliability concerns largely limit VoIP usage to either personal calls on cross-domain services such as Skype and Vonage, or to single-domain services such as trunking, where a core ISP carries long-distance voice as VoIP only within its backbone, to save cost with a unified voice/data infrastructure. This paper investigates the factors that prevent cross-domain VoIP deployments from achieving the quality and reliability of existing land-line telephony (PSTN). We ran over 50,000 VoIP phone calls between 24 locations in US and Europe for a three-week period. Our results indicate that VoIP usability is hindered as much by BGP’s slow convergence as network congestion. In fact, about half of the unintelligible VoIP samples in our data occur within 10 minutes of a BGP update.
An empirical investigation into the security of phone features in sip-based voip systems
- in Proc. The 5th Information Security Practice and Experience Conference(ISPEC’2009
, 2009
"... Abstract. Phone features, e.g., 911 call, voicemail, and Do Not Disturb, are critical and necessary for all deployed VoIP systems. In this paper, we empirically investigate the security of these phone features. We have implemented a number of attacks and experimented with VoIP services by leading Vo ..."
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Abstract. Phone features, e.g., 911 call, voicemail, and Do Not Disturb, are critical and necessary for all deployed VoIP systems. In this paper, we empirically investigate the security of these phone features. We have implemented a number of attacks and experimented with VoIP services by leading VoIP service providers Vonage, AT&T and Gizmo. Our ex-perimental results demonstrate that a man-in-the-middle or remote at-tacker could transparently 1) hijack selected E911 calls and impersonate the Public Safety Answering Point (PSAP); and 2) spoof the voicemail servers of both the caller and the callee of selected VoIP calls; and 3) make spam calls to VoIP subscribers even if Do Not Disturb is enabled. These empirical results confirm that leading deployed SIP-based VoIP systems have serious security vulnerabilities.
In the Matter of) IP-Enabled Services) WC Docket No. 04-36 E911 Requirements for IP-Enabled Service) WC Docket No. 05-196
"... Alliance 1 submits these comments in response to the Commission’s Notice of Proposed Rulemaking in the above captioned proceeding. 2 These comments consist of a document prepared by Professor Henning Schulzrinne 3 with the Global IP Alliance and considers how to move towards a globallyoriented, more ..."
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Alliance 1 submits these comments in response to the Commission’s Notice of Proposed Rulemaking in the above captioned proceeding. 2 These comments consist of a document prepared by Professor Henning Schulzrinne 3 with the Global IP Alliance and considers how to move towards a globallyoriented, more robust and functional IP-based next-generation emergency response 1 The Global IP Alliance (www.ipall.org) is an international consortium of IP-based communications services and applications providers committed to realizing the promise of IP communications and of interconnecting IP-based communications providers. The Alliance supports the need for addressing how IP-based services and applications are affected by existing local, national and international laws and promotes social objectives such as lawful intercept, emergency response, and access by persons with disabilities. Members of the Global IP Alliance include companies drawn from platform, applications and service providers currently developing, deploying and interconnecting IP-based networks, services and applications around the world. 2
Moving towards the Next-Generation 9-1-1 System
, 2005
"... Below, we consider (Section 2) why simply making the existing 9-1-1 system in the United States work for VoIP is not satisfactory and only suitable as a stop-gap measure for those consumers who have migrated over to VoIP services as a replacement for their former POTS service and have every right to ..."
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Below, we consider (Section 2) why simply making the existing 9-1-1 system in the United States work for VoIP is not satisfactory and only suitable as a stop-gap measure for those consumers who have migrated over to VoIP services as a replacement for their former POTS service and have every right to expect that substitute service to provide a comparable emergency response capability. We also
A Link Layer Solution to Location Identification of Emergency VoIP Callers
, 2010
"... Identifying the geographical location of a host on the Internet is a very challenging task. Due to a number of reasons, there is no direct mechanism that could enable this identification. Several approaches have been proposed to solve this problem but these have not proved to be suitable for some ap ..."
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Identifying the geographical location of a host on the Internet is a very challenging task. Due to a number of reasons, there is no direct mechanism that could enable this identification. Several approaches have been proposed to solve this problem but these have not proved to be suitable for some applications specially the critical VoIP calls. In this paper, we study this problem and propose the use of a MAC layer approach to solve this problem. We propose a solution based on LLDP-MED (Link Layer Discovery Protocol for Media Endpoint Devices) and compare it with LIS (Location Information Server). We discuss these two techniques in terms of network delay for two groups of users (wired line and wireless Internet users) for emergency cases and also discuss some other issues such as security and accuracy.
A Location-Aware Architecture Supporting Intelligent Real-Time Mobile Applications
, 2012
"... Computer Engineering Commons This Dissertation is brought to you for free and open access by the Graduate School at Scholar Commons. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Scholar Commons. For more information, please contact ..."
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Computer Engineering Commons This Dissertation is brought to you for free and open access by the Graduate School at Scholar Commons. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Scholar Commons. For more information, please contact
Emergency Service in Wi-Fi Networks without Access Point Association
"... Emergency “911 ” service is a critical function provided in the PSTN, cellular and VOIP networks. Wi-Fi, despite its growing importance, has no such service. In this paper, we develop a 911-like service for Wi-Fi capable devices, en-abling them to send emergency messages through any avail-able hotsp ..."
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Emergency “911 ” service is a critical function provided in the PSTN, cellular and VOIP networks. Wi-Fi, despite its growing importance, has no such service. In this paper, we develop a 911-like service for Wi-Fi capable devices, en-abling them to send emergency messages through any avail-able hotspot or access point. Our service makes use of ex-isting 802.11 management frames and does not require the client device to associate or authenticate with the access point; this makes it available even on protected networks to which the client would not normally have access, even en-crypted ones. This design ensures maximum potential reach and usability, and helps to increase public safety.
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"... Alliance1 submits these comments in response to the Commission’s Notice of Proposed Rulemaking in the above captioned proceeding.2 These comments consist of a document prepared by Professor Henning Schulzrinne3 with the Global IP Alliance and considers how to move towards a globally-oriented, more r ..."
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Alliance1 submits these comments in response to the Commission’s Notice of Proposed Rulemaking in the above captioned proceeding.2 These comments consist of a document prepared by Professor Henning Schulzrinne3 with the Global IP Alliance and considers how to move towards a globally-oriented, more robust and functional IP-based next-generation emergency response 1 The Global IP Alliance (www.ipall.org) is an international consortium of IP-based communications services and applications providers committed to realizing the promise of IP communications and of interconnecting IP-based communications providers. The Alliance supports the need for addressing how IP-based services and applications are affected by existing local, national and international laws and promotes social objectives such as lawful intercept, emergency response, and access by persons with disabilities. Members of the Global IP Alliance include companies drawn from platform, applications and service providers currently developing, deploying and interconnecting IP-based networks, services and
TRUST-BY-WIRE IN PACKET-SWITCHED NETWORKS: CALLING LINE IDENTIFICATION PRESENTATION FOR IP
"... During the last decades, the Internet has steadily developed into a mass medium with millions of users. On the one hand, newfangled services replace traditional ones. Naturally, these are thereby expected to offer at least the same features as their classical pendants, e.g., when VoIP replaces tradi ..."
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During the last decades, the Internet has steadily developed into a mass medium with millions of users. On the one hand, newfangled services replace traditional ones. Naturally, these are thereby expected to offer at least the same features as their classical pendants, e.g., when VoIP replaces traditional fixed line telephone networks. On the other hand, the requirements on network infrastructures and services have changed. A reason for that is the lack of Trust-by-Wire in packet-switched IP networks. In traditional telephone networks, a phone number directly coheres with a physical line. This direct relationship is not given in modern packet-switched IP networks. An IP address does not identify a physical line! This paper presents a new mechanism, which guarantees Trust-by-Wire in packetswitched IP networks—called Internet Protocol-Calling Line Identification Presentation (IPclip). Unambiguous and trustworthy location information is added on the IP level. Firstly, IPclip’s general functionality is presented. Secondly, we discuss IPclip in the light of location-aware emergency calls in nomadic VoIP environments.
