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-31.0 Resolution mul 72.27 div /CBarX1 exch def currentpoint exch
pop /CBarY1 exch def
0 4084 a 89 x Fk(URI)d(comparisons)32 b(are)d(case-insensiti)n(v)o(e.)
48 b(Ho)n(we)n(v)o(er)l(,)29 b(all)g(parameter)i(names)e(and)g(v)n
(alues)j Fc(S)t(H)t(O)t(U)t(L)t(D)f Fk(use)e(lo)n(wer)n(-case)0
4285 y(characters)d(since)f(tel)e(URIs)g(may)g(be)h(used)g(within)g
(conte)o(xts)i(where)d(comparisons)k(are)c(case-sensiti)n(v)o(e.)339
4435 y Fj(Section)c(19.1.4)h(in)e(the)h(SIP)f(speci\002cation)h([5)q(])
f(discusses)i(one)g(such)f(case.)0 4509 y
-31.0 Resolution mul 72.27 div /CBarX2 exch def currentpoint exch
pop /CBarY2 exch def
0 4509 a 0
4509 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX1 CBarY1 moveto CBarX2 CBarY2 lineto stroke grestore
0 4509 a 277 x Fi(4)119 b(URI)30 b(Syntax)0 4993
y Fk(The)e(URI)f(is)h(de\002ned)h(using)h(the)f(ABNF)d(\(augmented)k
(Backus-Naur)h(form\))d(described)j(in)d(RFC)f(2234)i([6)q(])f(and)g
(uses)0 5106 y(elements)d(from)e(the)h(core)g(de\002nitions)i
(\(Appendix)g(A)c(of)h(RFC)f(2234\).)141 5218 y(The)g(syntax)i
(de\002nition)h(follo)n(ws)e(RFC)e(2396)i([7)q(],)f(indicating)j(the)e
(actual)h(characters)i(contained)f(in)d(the)h(URI.)e(Note)0
5331 y(that)f(the)g(reserv)o(ed)h(characters)i(\223+\224,)d(\223;\224,)
g(\223=\224,)h(and)f(\223?\224)30 b Fc(M)t(U)t(S)t(T)24
b(N)t(O)q(T)e Fk(be)e(escaped)h(if)f(sho)n(wn)g(in)f(the)h(grammar)g
(de\002nitions)0 5656 y Fj(H.)e(Schulzrinne/A.)h(V)-8
b(aha-Sipila)972 b Fk(Expires)25 b(March)f(2003)974 b([P)o(age)23
b(3])p eop
%%Page: 4 4
4 3 bop 0 100 a Fk(INTERNET)-8 b(-DRAFT)754 b(draft-antti-rfc2806b)q
(is)q(-06)q(.ps)742 b(October)25 b(21,)e(2002)0 399 y(belo)n(w)j(as)g
(the)o(y)g(are)g(delimiters)i(for)e(the)g(\223tel\224)h(URI)e(scheme.)
37 b(These)26 b(reserv)o(ed)i(characters)i Fc(M)t(U)t(S)t(T)f
Fk(be)d(escaped)i(if)e(the)o(y)0 511 y(appear)f(in)e(parameter)j(v)n
(alues.)141 624 y(Characters)33 b(other)g(than)f(those)g(in)f(the)h
(\223reserv)o(ed\224)i(and)d(\223unsafe\224)j(sets)e(\(see)g(RFC)d
(2396)j([7)q(]\))f(are)h(equi)n(v)n(alent)h(to)0 737
y(their)24 b(\223\045)f(HEX)f(HEX\224)g(encoding.)141
850 y(The)h(\223tel\224)i(URI)d(has)i(the)g(follo)n(wing)h(syntax:)0
870 y
-31.0 Resolution mul 72.27 div /CBarX3 exch def currentpoint exch
pop /CBarY3 exch def
0 870 a 413 1043 a Fg(telephone-ur)q(i)389 b(=)99
b(\224tel:\224)26 b(subscr)q(iber)413 1155 y(subscr)q(iber)503
b(=)99 b(global-n)o(umber)23 b(/)i(local-n)o(umber)413
1268 y(global-n)o(umber)340 b(=)99 b(e164)24 b(*global-par)413
1381 y(global-par)517 b(=)99 b(par)o(ameter)24 b(/)i(isdn-subaddress)
413 1494 y(local-n)o(umber)397 b(=)99 b(phone-n)o(umber)22
b(*global-par)i(conte)m(xt)h(*global-par)413 1607 y(e164)719
b(=)99 b(\224+\224)26 b(4*15phonedigit)c(;)j(v)n(alid)g(E.164)f(n)o
(umber)413 1720 y(phone-n)o(umber)329 b(=)99 b(1*phonedigit)413
1833 y(isdn-subaddress)255 b(=)99 b(\224;isub=\224)26
b(1*ur)q(ic)413 1946 y(conte)m(xt)633 b(=)99 b(\224;phone-conte)m
(xt=\224)25 b(descr)q(iptor)h(*\(\224,)-9 b(\224)26 b(descr)q(iptor\))
413 2059 y(descr)q(iptor)523 b(=)99 b(domainname)22 b(/)k(global-n)o
(umber-digits)413 2172 y(global-n)o(umber-digits)98 b(=)h(\224+\224)26
b(phone-n)o(umber)413 2285 y(domainname)394 b(=)99 b(*\()26
b(domainlabel)d(\224.)-9 b(\224)26 b(\))f(toplabel)f([)h(\224.)-9
b(\224)26 b(])413 2397 y(domainlabel)430 b(=)99 b(alphan)o(um)1488
2510 y(/)26 b(alphan)o(um)c(*\()k(alphan)o(um)d(/)i(\224-\224)h(\))g
(alphan)o(um)413 2623 y(toplabel)603 b(=)99 b(ALPHA)24
b(/)h(ALPHA)f(*\()h(alphan)o(um)e(/)j(\224-\224)g(\))f(alphan)o(um)413
2736 y(par)o(am)665 b(=)99 b(\224;\224)26 b(pname)e([\224=\224)i(pv)n
(alue)e(])413 2849 y(pname)643 b(=)99 b(1*par)o(amchar)413
2962 y(pv)n(alue)656 b(=)99 b(1*par)o(amchar)413 3075
y(par)o(amchar)488 b(=)99 b(par)o(am-unreser)s(v)n(ed)23
b(/)i(unreser)s(v)n(ed)f(/)h(escaped)413 3188 y(reser)s(v)n(ed)568
b(=)99 b(\224;\224)26 b(/)g(\224/\224)g(/)g(\224?\224)f(/)g(\224:\224)i
(/)e(\224@\224)h(/)g(\224&\224)f(/)h(\224=\224)g(/)f(\224+\224)1488
3301 y(/)h(\224$\224)f(/)h(\224,)-9 b(\224)413 3414 y(unreser)s(v)n(ed)
466 b(=)99 b(alphan)o(um)23 b(/)i(mar)q(k)413 3527 y(escaped)578
b(=)99 b(\224\045\224)26 b(HEXDIG)e(HEXDIG)413 3639 y(par)o(am-unreser)
s(v)n(ed)178 b(=)99 b(\224[\224)26 b(/)g(\224]\224)g(/)g(\224/\224)g(/)
f(\224:\224)h(/)g(\224&\224)f(/)h(\224+\224)g(/)f(\224$\224)413
3752 y(phonedigit)501 b(=)99 b(HEXDIG)24 b(/)i(visual-separ)o(ator)413
3865 y(visual-separ)o(ator)277 b(=)99 b(\224-\224)26
b(/)g(\224.)-9 b(\224)26 b(/)g(\224\(\224)g(/)f(\224\)\224)413
3978 y(alphan)o(um)522 b(=)99 b(ALPHA)24 b(/)h(DIGIT)0
4097 y
-31.0 Resolution mul 72.27 div /CBarX4 exch def currentpoint exch
pop /CBarY4 exch def
0 4097 a 0 4097 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX3 CBarY3 moveto CBarX4 CBarY4 lineto stroke grestore
0 4097 a 141 4168 a Fk(Each)30
b(parameter)i(name)f(\(\223pname\224\),)i(the)e(ISDN)d(subaddress)34
b(and)c(the)h(conte)o(xt)j Fc(M)t(U)t(S)t(T)h(N)t(O)q(T)d
Fk(appear)g(more)e(than)0 4281 y(once.)36 b(The)25 b(order)h(of)g(the)g
(URL)d(parameters)28 b(is)d(immaterial.)2014 4202 y
-31.0 Resolution mul 72.27 div /CBarX5 exch def currentpoint exch
pop /CBarY5 exch def
2014
4202 a 79 x Fk(T)-7 b(o)25 b(f)o(acilitate)j(comparison)g(in)d(conte)o
(xts)j(where)e(the)f(\223tel\224)0 4394 y(URI)f(is)h(compared)i
(character)n(-by-chara)q(cte)q(r)l(,)k(such)26 b(as)g(SIP)e(URIs)g([5)q
(],)h(the)h(ISDN)d(subaddress)31 b Fc(S)t(H)t(O)t(U)t(L)t(D)d
Fk(appear)f(\002rst,)0 4506 y(if)c(present,)i(follo)n(wed)g(by)f(the)f
(conte)o(xt,)i(if)e(present,)i(follo)n(wed)g(by)f(an)o(y)f(other)i
(parameters)g(in)f(alphabetical)j(order)-5 b(.)3710 4506
y
-31.0 Resolution mul 72.27 div /CBarX6 exch def currentpoint exch
pop /CBarY6 exch def
3710 4506 a 3710 4506 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX5 CBarY5 moveto CBarX6 CBarY6 lineto stroke grestore
3710 4506 a 0 4797 a Fi(5)119
b(Phone)31 b(Numbers)f(and)h(Their)g(Scope)0 5007 y Fh(5.1)99
b(Phone)26 b(Numbers)0 5181 y Fk(The)20 b Fg(subscr)q(iber)h
Fk(part)g(of)g(the)g(URI)e(indicates)k(the)f(number)-5
b(.)28 b(The)21 b(phone)h(number)f(can)g(be)g(represented)j(in)d
(either)h(global)0 5294 y(\(E.164\))k(or)g(local)h(notation.)39
b(All)25 b(phone)j(numbers)h Fc(M)t(U)t(S)t(T)g Fk(use)e(the)f(global)h
(form)f(unless)i(the)o(y)e(cannot)i(be)e(represented)0
5407 y(as)g(such.)37 b(Numbers)27 b(from)f(pri)n(v)n(ate)h(numbering)h
(plans,)g(emer)n(genc)o(y)g(\(\223911\224,)g(\223112\224\))f(and)g
(some)f(directory)i(assistance)0 5656 y Fj(H.)18 b(Schulzrinne/A.)h(V)
-8 b(aha-Sipila)972 b Fk(Expires)25 b(March)f(2003)974
b([P)o(age)23 b(4])p eop
%%Page: 5 5
5 4 bop 0 100 a Fk(INTERNET)-8 b(-DRAFT)754 b(draft-antti-rfc2806b)q
(is)q(-06)q(.ps)742 b(October)25 b(21,)e(2002)0 399 y(numbers)k
(\(e.g.,)f(\223411\224\))h(and)f(other)h(\223service)h(codes\224)f
(\(numbers)g(of)f(the)g(form)f(N11)h(in)f(the)h(United)h(States\))f
(cannot)h(be)0 511 y(represented)36 b(in)c(global)i(\(E.164\))e(form,)j
(and)d(need)h(to)g(be)f(represented)k(as)c(a)g(local)h(number)g(with)f
(a)g(conte)o(xt.)57 b(Local)0 624 y(numbers)27 b Fc(M)t(U)t(S)t(T)g
Fk(be)c(tagged)i(with)f(a)f Fg(phone-conte)m(xt)p Fk(.)141
737 y(Implementations)h Fc(M)t(U)t(S)t(T)h(N)t(O)q(T)c
Fk(assume)f(that)f(telephone)j(numbers)e(ha)n(v)o(e)g(a)e(maximum,)i
(minimum)e(or)h(\002x)o(ed)g(length,)0 850 y(or)k(that)i(the)o(y)e(al)o
(w)o(ays)i(be)o(gin)f(with)g(a)f(certain)i(number)-5
b(.)0 1096 y Ff(5.1.1)92 b(Separators)25 b(in)d(Phone)g(Numbers)0
1270 y Fk(Phone)h(numbers)k Fc(M)t(A)l(Y)d Fk(contain)h(visual)f
(separators.)31 b(V)-5 b(isual)23 b(separators)j(\()p
Fg(visual-separ)o(ator)p Fk(\))c(merely)i(aid)f(readability)0
1383 y(and)j Fc(M)t(U)t(S)t(T)h Fk(be)c(ignored)j(by)d(the)h(client.)
141 1496 y(Ev)o(en)29 b(though)j(ITU-T)27 b(E.123)j([8)q(])e
(recommends)k(the)e(use)f(of)h(space)g(characters)j(as)c(visual)i
(separators)h(in)d(printed)0 1609 y(telephone)d(numbers,)f(tel)e(URIs)i
Fc(M)t(U)t(S)t(T)k(N)t(O)q(T)c Fk(use)f(spaces.)0 1855
y Ff(5.1.2)92 b(Alphabetic)23 b(Characters)0 2029 y Fk(In)31
b(some)h(countries,)j(it)c(is)g(popular)i(to)e(write)h(phone)g(numbers)
h(using)f(alphabetic)i(characters)g(which)e(correspond)i(to)0
2142 y(certain)24 b(numbers)h(on)e(the)g(telephone)j(k)o(e)o(ypad.)k
(The)22 b(URI)g(format)h(does)h(not)f(support)i(this)f(notation)h
(since)f(the)f(mapping)0 2255 y(from)j(alphabetic)k(characters)f(to)d
(digits)i(is)e(not)h(completely)h(uniform)g(internationally)-6
b(,)31 b(although)e(there)e(are)g(standards)0 2368 y([9)q(,)22
b(10)q(])h(addressing)k(this)d(issue.)141 2481 y(Since)29
b(called)i(and)e(calling)i(terminal)g(numbers)f(\(TNs\))e(are)i
(encoded)h(in)e(BCD)e(in)i(ISUP)-10 b(,)27 b(this)j(allo)n(ws)f(for)h
(six)f(ad-)0 2594 y(ditional)34 b(v)n(alues)e(per)g(digit,)i(sometimes)
f(represented)h(as)e(the)g(he)o(xadecimal)h(characters)i(A)30
b(through)k(F)-7 b(.)29 b(Ho)n(we)n(v)o(er)l(,)k(in)0
2707 y(accordance)j(with)d(E.164,)i(the)o(y)f(may)e(not)i(be)f
(included)i(in)e(global)i(numbers.)59 b(Their)33 b(use)g(in)g(local)h
(numbers)h(is)e(not)0 2820 y(de\002ned,)24 b(b)n(ut)g(is)g(not)f
(prohibited.)0 3065 y Ff(5.1.3)92 b(Global)23 b(and)f(Local)i(Numbers)0
3240 y Fk(Global)30 b(\(international\))j(numbers)d(are)f(identi\002ed)
i(by)e(the)g(\223+\224)g(character)i(pre\002x.)45 b(Global)30
b(numbers)i Fc(M)t(U)t(S)t(T)g Fk(be)d(com-)0 3353 y(posed)d(with)f
(the)g(country)h(\(CC\))e(and)i(national)g(\(NSN\))e(numbers)i(as)f
(speci\002ed)h(in)e(E.123)h(and)g(E.164)g([8)q(,)e(11)q(].)32
b(Interna-)0 3465 y(tional)25 b(numbers)h(ha)n(v)o(e)f(the)f(property)j
(of)d(being)h(unambiguous)i(e)n(v)o(erywhere)f(in)e(the)h(w)o(orld)f
(and)h(are)h Fc(R)t(E)t(C)t(O)t(M)t(M)t(E)t(N)t(D)t(E)t(D)r
Fk(.)0 3499 y
-31.0 Resolution mul 72.27 div /CBarX7 exch def currentpoint exch
pop /CBarY7 exch def
0 3499 a 79 x Fk(Only)f(numbers)h(that)f(are)h(dialable)g
(from)f(an)o(ywhere)h(are)f(considered)j(global)f(numbers.)34
b(In)24 b(particular)l(,)k(toll-free)f(num-)0 3691 y(bers)d(that)g(are)
g(only)g(dialable)i(from)d(within)h(their)h(o)n(wn)e(country)i(code)g
(are)e(not)h(considered)j(global)e(numbers.)3581 3691
y
-31.0 Resolution mul 72.27 div /CBarX8 exch def currentpoint exch
pop /CBarY8 exch def
3581 3691 a 3581 3691 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX7 CBarY7 moveto CBarX8 CBarY8 lineto stroke grestore
3581 3691 a 141 3804 a Fk(Local)g(numbers)h
(only)g(w)o(ork)f(within)h(a)e(certain)i(geographical)j(area)d(or)e(a)h
(certain)h(part)g(of)f(the)g(telephone)i(netw)o(ork,)0
3917 y(e.g.,)e(a)g(pri)n(v)n(ate)h(branch)h(e)o(xchange)h(\(PBX\))c(or)
h(a)g(particular)j(country)-6 b(.)36 b(URIs)24 b(with)i(local)g(phone)h
(numbers)f(should)h(only)0 4030 y(appear)e(in)e(en)l(vironments)k
(where)c(all)h(local)g(entities)h(can)e(successfully)k(set)d(up)f(the)h
(call)f(by)h(passing)h(the)f(number)g(to)f(the)0 4143
y(dialing)e(softw)o(are.)29 b(Digits)20 b(needed)i(for)e(accessing)i
(an)e(outside)h(line,)g(for)f(e)o(xample,)h(are)f(not)g(included)i(in)e
(local)g(numbers.)0 4163 y
-31.0 Resolution mul 72.27 div /CBarX9 exch def currentpoint exch
pop /CBarY9 exch def
0 4163 a 141 4256 a Fk(The)25
b Fg(phone-conte)m(xt)e Fk(parameter)29 b Fc(M)t(U)t(S)t(T)g
Fk(be)d(chosen)h(to)e(unambiguously)k(identify)f(the)e(local)g(conte)o
(xt)h(where)f(the)0 4369 y(local)i(number)h(is)e(v)n(alid.)42
b(The)27 b(parameter)i(v)n(alue)f(is)g(de\002ned)g(by)g(the)f(assignee)
j(of)e(the)f(local)i(number)-5 b(.)41 b(The)28 b(parameter)0
4482 y(can)c(contain)h(a)e(list)h(of)f(conte)o(xts)j(that)e(enumerate)h
(all)f(the)f(conte)o(xts)j(where)d(this)h(number)h(is)e(v)n(alid.)29
b(It)24 b(does)g(NO)l(T)e(in)h(an)o(y)0 4595 y(w)o(ay)d(indicate)i(a)e
(pre\002x)h(that)g(turns)g(the)f(local)i(number)f(into)g(a)f(global)h
(\(E.164\))g(number)-5 b(.)29 b(The)19 b Fg(phone-conte)m(xt)f
Fk(pro)o(vides)0 4707 y(a)27 b(unique)i(identi\002er)f(that)g(lets)g(a)
f(client)h(kno)n(w)f(whether)i(it)e(can)g(interpret)j(the)d(local)h
(number)h(or)e(not.)40 b(It)27 b(has)h(not)f(other)0
4820 y(meaning)e(or)e(function.)141 4933 y(There)e(are)g(tw)o(o)f(w)o
(ays)h(to)f(label)i(the)f(conte)o(xt:)29 b(via)21 b(a)f(global)i
(number)f(pre\002x)g(\(e.g.,)g(\223+33\224\))h(and)f(via)g(a)f(domain)h
(name,)0 5046 y(e.g.,)j(\223houston.e)o(xample.com\224.)37
b(The)24 b(choice)j(between)f(the)f(tw)o(o)f(is)h(left)g(to)f(the)h
(\223o)n(wner\224)h(of)f(the)g(local)g(number)h(and)f(is)0
5159 y(go)o(v)o(erned)e(by)f(whether)h(there)f(is)g(a)f(global)i
(number)g(pre\002x)f(or)f(domain)i(name)e(that)i(is)e(a)g(v)n(alid)i
(identi\002er)g(for)e(a)h(particular)0 5272 y(local)i(number)-5
b(.)0 5273 y
-31.0 Resolution mul 72.27 div /CBarX10 exch def currentpoint exch
pop /CBarY10 exch def
0 5273 a 0 5273 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX9 CBarY9 moveto CBarX10 CBarY10 lineto stroke grestore
0 5273 a 383 x Fj(H.)18
b(Schulzrinne/A.)h(V)-8 b(aha-Sipila)972 b Fk(Expires)25
b(March)f(2003)974 b([P)o(age)23 b(5])p eop
%%Page: 6 6
6 5 bop 0 100 a Fk(INTERNET)-8 b(-DRAFT)754 b(draft-antti-rfc2806b)q
(is)q(-06)q(.ps)742 b(October)25 b(21,)e(2002)0 307 y
-31.0 Resolution mul 72.27 div /CBarX9 exch def currentpoint exch
pop /CBarY9 exch def
0 307 a 339 399 a Fj(The)j(tw)o(o)f(label)h(types)g(were)f(chosen)i(so)
f(that,)g(in)g(almost)f(all)g(cases,)i(a)f(local)f(administrator)h(can)
g(pick)g(an)g(identi\002er)f(that)227 490 y(is)h(reasonably)h
(descripti)n(v)o(e)g(and)f(does)h(not)f(require)g(a)g(ne)n(w)g
(assigned)h(number)l(.)45 b(It)25 b(is)h(up)g(to)g(the)g(administrator)
g(to)g(assign)g(an)227 581 y(appropriate)16 b(identi\002er)f(and)h(to)f
(use)g(it)f(consistently)-5 b(.)23 b(Often,)16 b(an)f(or)o(ganization)g
(can)h(choose)g(among)h(se)n(v)o(eral)e(dif)n(ferent)g(identi\002ers.)
141 752 y Fk(The)31 b(domain)h(name)f(does)h(not)g(ha)n(v)o(e)g(to)f
(resolv)o(e)h(to)f(an)o(y)g(actual)i(host,)g(b)n(ut)h
Fc(M)t(U)t(S)t(T)g Fk(be)e(under)g(the)f(administrati)n(v)o(e)0
865 y(control)25 b(of)f(the)g(entity)g(managing)i(the)d(local)i(phone)g
(conte)o(xt.)0 885 y
-31.0 Resolution mul 72.27 div /CBarX11 exch def currentpoint exch
pop /CBarY11 exch def
0 885 a 141 978 a Fk(A)k(global)i(number)f
(pre\002x)g(consists)i(of)d(the)h(initial)h(digits)g(of)e(a)g(v)n(alid)
i(global)g(number)-5 b(.)47 b(When)30 b(a)f(global)i(number)0
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0 3210 a 111 x Fk(A)d(phone)j(number)i
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%%Trailer
end
userdict /end-hook known{end-hook}if
%%EOF