Philip Matthews

Samsung (United States)

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Concepts and Terminology for Peer-to-Peer SIP (P2PSIP)

D.E. Bryan Philip Matthews E. Shim David W. Willis Spencer Dawkins

This document defines concepts and terminology for using the Session Initiation Protocol in a peer-to-peer environment where the traditional proxy-registrar and message-routing functions are replaced by a distributed mechanism.These mechanisms may be implemented using a Distributed Hash Table or other distributed data mechanism with similar external properties.This document includes a high-level view of the functional relationships between the network elements defined herein, a conceptual model of operations, and an outline of the related problems addressed by the P2PSIP working group, the REsource LOcation And Discovery (RELOAD) protocol, and the SIP usage document defined by the working group.

10.17487/rfc7890

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Citations (2)

The Effect of NATs on P2PSIP Overlay Architecture

Eric Cooper Philip Matthews

This paper explains the problems created by Network Address Translators (NATs) in Peer-to-Peer (P2P) overlays and recommends some NAT traversal techniques appropriate for P2PSIP networks. Two P2PSIP overlay architectures that accommodate the presence of NATs are described and analyzed. The first is the super-peer scheme used in a number of p2p file-sharing systems today. The second is a scheme where all peers play an equal role in the overlay.

Overlay network

Network address

NAT traversal

File Sharing

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Citations (2)

Meeting health needs of asylum seekers. Practical approaches can make care easier.

PubMed (1999)

Philip Matthews

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Citations (2)

Document is worrying

BMJ (2007)

Philip Matthews

We select the letters for these pages from the rapid responses posted on bmj.com favouring those received within five days of publication of the article to which they refer.Letters are thus an early selection of rapid responses on a particular topic.Readers should consult the website for the full list of responses and any authors' replies, which usually arrive after our selection. cnri/spl Acute bronchiolitis risk of hyponatraemiaBush and Thomson stated that electrolytes should be determined only in infants with bronchiolitis who are dehydrated. 1 However hyponatraemia is seen in up to 33% of children in hospital with this disease. 2It is unrelated to dehydration and has been associated with administration of intravenous fluids together with increased antidiuretic hormone values. 3 4 It can cause generalised tonic-clonic seizures, 2 which may be refractory to anticonvulsants.The National Patient Safety Agency has issued an alert aimed at reducing the risk of hyponatraemia in children -electrolytes should be determined before starting intravenous fluids and at least daily afterwards. 5 Fluids should be restricted in children with hyponatraemia who are receiving intravenous 0.9% saline (with 5% dextrose) and who have high antidiuretic hormone concentrations.

Data access

10.1136/bmj.39409.435428.be

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English classes are being cut

BMJ (2007)

Philip Matthews

Cutting translation services could be seen as “tough love” to help non-English speakers help themselves.1 In my experience of working as a general practitioner and as a psychiatrist with asylum seekers, they are usually very …

Seekers

10.1136/bmj.39143.031296.1f

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Basic HIP Extensions for Traversal of Network Address Translators

Miika Komu Philip Matthews Ari Keränen Thomas R. Henderson Hannes Tschofenig

This document specifies extensions to the Host Identity Protocol (HIP) to facilitate Network Address Translator (NAT) traversal. The extensions are based on the use of the Interactive Connectivity Establishment (ICE) methodology to discover a working path between two end-hosts, and on standard techniques for encapsulating Encapsulating Security Payload (ESP) packets within the User Datagram Protocol (UDP). This document also defines elements of procedure for NAT traversal, including the optional use of a HIP relay server. With these extensions HIP is able to work in environments that have NATs and provides a generic NAT traversal solution to higher-layer networking applications.

NAT traversal

Datagram

Payload (computing)

Nat

Network address

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Citations (10)

Industrial-Strength P2P SIP

Philip Matthews

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Citations (3)

Meeting health needs of asylum seekers

BMJ (1999)

Helen Hogan Philip Matthews

Carriage of meningococci in contacts of patients with meningococcal disease"Kissing contacts" need to be defined Editor-In their study Kristiansen et al show high carriage rates of pathogenic strains of Neisseria menigitidis in household and kissing contacts of patients with invasive meningococcal disease. 1 While it is easy to define a household contact it may be more difficult to define a kissing contact.There are many types of kiss, ranging from a "peck on the cheek" to much more!In some cultures kissing is as common as shaking hands.In such situations widespread chemoprophylaxis to "kissing contacts" may not be appropriate.It would be valuable to know whether Kristiansen et al placed any restrictions on who was defined as a kissing contact.

Outreach

White paper

10.1136/bmj.318.7184.671

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Citations (5)

The right architect for this job

Philip Matthews

Ian Athfield appointed as architectural ambassador for reconstruction. He will head a team of architects and urban designers to prepare concept plans and designs for the city. Includes comment from Peter Beaven, Douglas Lloyd Jenkins, Ann Hercus.

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Stateful NAT64: Network Address and Protocol Translation from IPv6 Clients to IPv4 Servers RFC 6146

Marcelo Bagnulo Philip Matthews Iljitsch van Beijnum

This document describes stateful NAT64 translation, which allows IPv6-only clients to contact IPv4 servers using unicast UDP, TCP, or ICMP. One or more public IPv4 addresses assigned to a NAT64 translator are shared among several IPv6-only clients. When stateful NAT64 is used in conjunction with DNS64, no changes are usually required in the IPv6 client or the IPv4 server.

IPv4

Unicast

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Citations (35)