While the IETF is the body that establishes the core SIP protocol definitions in Internet standard documents ( RFCs ), the SIP Forum performs ancillary technical activities.

While the IETF standardizes SIP and ancillary protocols, the IETF is not the right organization to create documents with the force of standards, but which are application-level and use-level documents.

While at Manchester he was a member of the IETF Working Group on HTML, developing HTML 2. 0, and was also one of the authors of the PNG raster graphics format.

While Aristotle censors literature only for the young, Plato would banish all poets from his ideal state.

While Councilman Olson cited the anticipated increase in school costs in answer to a direct question from a taxpayer, the impact upon a school system does not have to be measured only in increased taxes to find alarm in uncontrolled growth.

While there should be no general age limit or restriction to one sex, there will be particular projects requiring special maturity and some open only to men or to women.

While some suppression and some denial are not only necessary but healthy, the worker's clinical knowledge must determine how these defenses are being used, what healthy shifts in defensive adaptation are indicated, and when efforts at bringing about change can be most effectively timed.

While the interpretations that have been given are inferences only, they gain support from such comments as the following, which was made by one of the Kohnstamm-negative subjects who did not, on the first trial, perceive the tilt illusion.

While ATP appears to be necessary for the occurrence of contraction, its presence and enzymatic hydrolysis of it by the muscle protein myosin are not the only criteria for contraction.

While man shares this procreative function with all his predecessors in the evolutionary process, he is the only animal with a true non-instinctive and conscious creative ability.

While a hazy part of my mind concentrated on swimming down, a clear part sorted over recent events, among them my only positive act in a long time.

While the group only recorded one album together as the Analog Brothers, a few bootlegs of its live concert performances, including freestyles with original lyrics, have occasionally surfaced online.

While accompanying Mallowan on countless archaeological trips ( spending up to 3 – 4 months at a time in Syria and Iraq at excavation sites at Ur, Ninevah, Tell Arpachiyah, Chagar Bazar, Tell Brak, and Nimrud ), Christie not only wrote novels and short stories, but also contributed work to the archaeological sites, more specifically to the archaeological restoration and labeling of ancient exhibits which includes tasks such as cleaning and conserving delicate ivory pieces, reconstructing pottery, developing photos from early excavations which later led to taking photographs of the site and its findings, and taking field notes.

While resistant to most beta lactam antibiotics commonly used for skin infections, it remains sensitive to alternative antibiotics, e. g., clindamycin ( Cleocin ), trimethoprim-sulfamethoxazole ( Bactrim ), and doxycycline ( unlike hospital-acquired MRSA that may only be sensitive to vancomycin IV ).

While White and Black children were both instructed in ASL, only Black teachers were permitted to instruct Black deaf children.

While they have a total of of shoreline, measured along the outer edge of the reef, there are no ports or harbors, only offshore anchorage.

While in the past the state enjoyed a variety of mammals such as Plains Bison, Eastern elk, bear, and deer, only the White-tailed deer remains abundant.

While entrance to the Park is free, Gaudí's house, " la Torre Rosa ," — containing furniture that he designed — can be only visited for an entrance fee.

While at Jerusalem, Absalom built support for himself among the populace by promising justice for all " if only I were appointed judge in the land ", and by showing humility by kissing those who approached him rather than accepting supplication.

While the Mercury capsule could only support one astronaut on a limited Earth orbital mission, the Apollo spacecraft was to be able to carry three astronauts on a circumlunar flight and eventually to a lunar landing.

Some scholars believe that the apologetic view of Luke ’ s work is overemphasized and that it should not be regarded as a “ major aim of the Lucan writings .” While Munck believes that purpose of Luke ’ s work is not that clear-cut and sympathizes with other claims, he believes that Luke ’ s work can function as an apology only in the sense that it “ presents a defense of Christianity and Paul ” and may serve to “ clarify the position of Christianity within Jewry and within the Roman Empire .” Pervo disagrees that Luke ’ s work is an apology and even that it could possibly be addressed to Rome because he believes that “ Luke and Acts speak to insiders, believers in Jesus .” Freedman believes that Luke is writing an apology but that his goal is “ not to defend the Christian movement as such but to defend God ’ s ways in history .”

While the complete title of the book is the Acts of the Apostles, really the book focuses on only two men: The Apostle Peter ( chs.

While the term " anti-globalization " arose from the movement's opposition to free-trade agreements ( which have often been considered part of something called " globalization "), various participants contend they are opposed to only certain aspects of globalization and instead describe themselves, at least in French-speaking organisations, as " anti-capitalist ", " anti-plutocracy ," or " anti-corporate.

While 700 Ethiopians are killed and many more injured, only two die from the British / Indian troops.

While the adapter was only made to work on the two-port version, modifications can be made to the four-port to make it line-compatible.

While an organism with complete absence of melanin is called an albino ( American English, or British English ) an organism with only a diminished amount of melanin is described as albinoid.

While the Dines anemometer had an error of only 1 % at it did not respond very well to low winds due to the poor response of the flat plate vane required to turn the head into the wind.

While in the fort he only communicated with the outside world by a crevice through which food would be passed and he would say a few words.

While Plato finally allows a few acceptable hymns to the gods and famous men, still he clearly leaves the way open for further discussion of the issue.

While the standard rules allow hopping over only a single adjacent occupied position at a time ( as in checkers ), this version of the game allows pieces to catapult over multiple adjacent occupied positions in a line when hopping.

While counter weights add a considerable amount of weight to the crankshaft, it provides a smoother running engine and allows higher RPM levels to be reached.

While many of these systems involve cars permanently attached to the cable, the system developed by Poma-Otis, a company formed by the merger of the cable car interests of the Pomagalski ski lift company and the Otis Elevator Company, allows the car to be decoupled from the cable under computer control, and can thus be considered a modern interpretation of the cable car.

While Gramsci's views argue that culture ( beliefs, perceptions and values ) allows the ruling class to maintain domination, Marx's explanation is along more economic lines, with concepts such as commodity fetishism demonstrating how the ideology of the bourgeoisie ( in this case, the existence of property as a social creation rather than an ' eternal entity ') dominate over that of the working classes.

While the article specifically prohibits discrimination based on " sex, race, colour, language, religion, political or other opinion, national or social origin, association with a national minority, property, birth or other status ", the last of these allows the court to extend to Article 14 protection to other grounds not specifically mentioned such as has been done regarding discrimination based on a person's sexual orientation.

While the description of strong and weak interactions within the Standard Model is based on gauge symmetries governed by the simple symmetry groups SU ( 3 ) and SU ( 2 ) which allow only discrete charges, the remaining component, the weak hypercharge interaction is described by an abelian symmetry U ( 1 ) which in principle allows for arbitrary charge assignments.

While the Florida law allows police to initiate the examination, it is the recommendations of two psychiatrists that guide the decisions of the court.

While proponents may say that secrecy allows the jury to remain impartial by protecting it from undue pressure or attention, opponents contend that this prevents there from being a transparent trial.

While data reduction ( compression, be it lossy or lossless ) is a main goal of transform coding, it also allows other goals: one may represent data more accurately for the original amount of space – for example, in principle, if one starts with an analog or high-resolution digital master, an MP3 file of a given size should provide a better representation than a raw uncompressed audio in WAV or AIFF file of the same size.

While it is one of the most commonly used concepts in logic it must not be mistaken for a logical law ; rather, it is one of the accepted mechanisms for the construction of deductive proofs that includes the " rule of definition " and the " rule of substitution " Modus ponens allows one to eliminate a conditional statement from a logical proof or argument ( the antecedents ) and thereby not carry these antecedents forward in an ever-lengthening string of symbols ; for this reason modus ponens is sometimes called the rule of detachment.

While the exposure of the wheels to the airstream causes a very high aerodynamic drag at high speeds, it allows improved cooling of the brakes, which is important on road courses with their frequent changes of pace.

While this seems restrictive at first, it allows the code that does the rendering to be completely independent of the operating system it is running on, allowing cross-platform development.

While arm power, accuracy, and pocket presence – the ability to successfully operate from within the " pocket " formed by his blockers – are still the most important quarterback virtues, the ability to elude or run past defenders creates an additional threat that allows greater flexibility in the team's passing and running game.

While one perception is that leisure is just " spare time ", time not consumed by the necessities of living, another holds that leisure is a force that allows individuals to consider and reflect on the values and realities that are missed in the activities of daily life, thus being an essential element of personal development and civilization.

While refraction allows for phenomena such as rainbows, it may also produce peculiar optical phenomena, such as mirages and Fata Morgana.

While a simple scalar treatment of the moment of inertia suffices for many situations, a more advanced tensor treatment allows the analysis of such complicated systems as spinning tops and gyroscopic motion.

While real-world sound changes often admit exceptions ( for a variety of known reasons, and sometimes without one ), the expectation of their regularity or " exceptionlessness " is of great heuristic value, since it allows historical linguists to define the notion of regular correspondence ( see: comparative method ).

While digitization allows wideband voice on the same channel, the improved quality of a wider analog voice channel did not find a large market in the PSTN.

While his earlier comedies suffer from an unevenness resulting from the thematic clash between the trivial and the serious, Earnest achieves a pitch-perfect style that allows these to dissolve.

While it is common to say that BGP allows an administrator to set policies on how prefixes are handled by ISPs, this is generally not possible, strictly speaking.

While interoperability was initially defined for IT systems or services and only allows for information to be exchanged ( see definition below ), a more generic definition could be this one:

While previous versions streamed media to UPnP compliant devices ( Digital Media Server role ) and could play media by fetching it from a network share ( Digital Media Player role ), Windows Media Player 12 can access media from the shared media libraries on the network or HomeGroup, stream media to DLNA 1. 5 compliant devices and allows itself ( once the remote control option is turned on ) to be remotely controlled by Digital Media Controller devices which stream media ( Digital Media Renderer role ).

While precise calculation of positronium energy levels uses the Bethe-Salpeter equation, the similarity between positronium and hydrogen allows for a rough estimate.