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g(can)f(reproduce)i(the)e(actions)i(speci\002ed)f(in)f(the)0
3947 y(dial)29 b(string,)i(by)d(sending)j(DTMF)26 b(digits,)31
b(w)o(aiting)e(for)g(dial)g(tone,)h(pausing)h(and)d(generating)k
(post-dial)f(DTMF)26 b(digits)0 4060 y(after)g(the)f(callee)h(picks)g
(up.)33 b(Another)27 b(approach)g(has)e(the)h(URI)d(specify)k(the)e
(telephone)j(number)l(,)e(which)g(can)f(be)g(either)0
4173 y(globally)30 b(unique)g(or)f(only)g(be)f(v)n(alid)h(within)g(a)e
(local)j(conte)o(xt.)44 b(A)27 b(dialer)i(application)j(is)c(a)o(w)o
(are)g(of)g(the)h(local)g(conte)o(xt,)0 4286 y(kno)n(wing,)i(for)e(e)o
(xample,)i(whether)f(special)h(digits)f(need)g(to)f(be)g(dialed)i(to)e
(seize)h(an)f(outside)i(line,)f(whether)g(netw)o(ork,)0
4399 y(pulse)24 b(or)f(tone)h(dialing)g(is)f(needed)i(and)e(what)g
(tones)h(indicate)h(call)f(progress.)31 b(The)22 b(dialer)i(then)g(con)
l(v)o(erts)h(the)f(telephone)0 4511 y(number)29 b(into)g(a)f(dial)g
(string)i(and)f(performs)g(the)g(necessary)h(signaling)h(actions.)45
b(The)27 b(document)j(belo)n(w)f(assumes)g(the)0 4624
y(second)h(model.)44 b(The)29 b(dialer)g(does)h(not)f(ha)n(v)o(e)g(to)f
(be)h(a)f(user)h(application)j(as)c(found)i(in)f(traditional)i(desktop)
g(operating)0 4737 y(systems,)24 b(b)n(ut)g(could)h(well)e(be)h(part)g
(of)g(an)f(IP-to-PSTN)f(gate)n(w)o(ay)-6 b(.)141 4850
y(The)34 b(approach)i(pursued)h(here)d(has)h(the)f(disadv)n(antage)k
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0 4963 y(\(when)24 b(direct)h(inw)o(ard)f(dialing)h(is)f(not)f(used\))i
(or)f(electronic)i(banking,)f(cannot)g(be)f(speci\002ed)h(in)e(a)g
(URI.)141 5076 y(The)35 b(URI)g(can)h(be)f(used)i(as)e(a)g(request)j
(URI)c(in)i(SIP)e([7])h(requests.)67 b(The)36 b(SIP)e(speci\002cation)k
(also)e(inherits)i(the)0 5189 y Fh(subscr)q(iber)23 b
Fl(part)g(of)g(the)g(syntax)i(as)d(part)i(of)f(the)g
Fh(user)f Fl(element)i(in)f(the)g(SIP)e(URI.)h(Other)h(protocols)i(may)
e(use)g(this)g(URI)0 5302 y(for)h(both)g(query-based)j(and)d
(pre\002x-based)i(applications.)0 5656 y Fk(H.)18 b(Schulzrinne/A.)h(V)
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b([P)o(age)23 b(3])p eop
%%Page: 4 4
4 3 bop 0 100 a Fl(INTERNET)-8 b(-DRAFT)736 b(draft-antti-rfc2806)q(bi)
q(s-0)q(8.ps)725 b(February)25 b(19,)e(2003)141 399 y(The)30
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g(ne)o(gotiated)j(either)e(in-band)0 624 y(by)f(the)f(telephone)k(de)n
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1325 y Fj(3)119 b(URI)30 b(Syntax)0 1532 y Fl(The)e(URI)f(is)h
(de\002ned)h(using)h(the)f(ABNF)d(\(augmented)k(Backus-Naur)h(form\))d
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1645 y(elements)d(from)e(the)h(core)g(de\002nitions)i(\(Appendix)g(A)c
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(characters)i(\223+\224,)d(\223;\224,)g(\223=\224,)h(and)f(\223?\224)30
b Fd(M)t(U)t(S)t(T)24 b(N)t(O)q(T)e Fl(be)e(escaped)h(if)f(sho)n(wn)g
(in)f(the)h(grammar)g(de\002nitions)0 1984 y(belo)n(w)26
b(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 Fd(M)t(U)t(S)t(T)f
Fl(be)d(escaped)i(if)e(the)o(y)0 2097 y(appear)f(in)e(parameter)j(v)n
(alues.)141 2210 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(\(see)g(RFC)d
(2396)j([3)q(]\))f(are)h(equi)n(v)n(alent)h(to)0 2323
y(their)24 b(\223\045)f(HEX)f(HEX\224)g(encoding.)141
2436 y(The)h(\223tel\224)i(URI)d(has)i(the)g(follo)n(wing)h(syntax:)0
2455 y
-31.0 Resolution mul 72.27 div /CBarX3 exch def currentpoint exch
pop /CBarY3 exch def
0 2455 a 413 2596 a Fh(telephone-ur)q(i)389 b(=)99
b(\224tel:\224)26 b(subscr)q(iber)413 2709 y(subscr)q(iber)503
b(=)99 b(global-n)o(umber)23 b(/)i(local-n)o(umber)413
2822 y(global-n)o(umber)340 b(=)99 b(global-n)o(umber-digits)23
b(*par)413 2935 y(local-n)o(umber)397 b(=)99 b(local-n)o(umber-digits)
25 b(*par)f(conte)m(xt)i(*par)413 3048 y(par)791 b(=)99
b(par)o(ameter)24 b(/)i(e)m(xtension)e(/)i(isdn-subaddress)413
3161 y(isdn-subaddress)255 b(=)99 b(\224;isub=\224)26
b(1*ur)q(ic)413 3274 y(e)m(xtension)536 b(=)99 b(\224;e)m(xt=\224)27
b(1*phonedigit)413 3387 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 3500 y(descr)q(iptor)523 b(=)99 b(domainname)22 b(/)k(global-n)o
(umber-digits)413 3612 y(global-n)o(umber-digits)98 b(=)h(\224+\224)26
b(1*phonedigit)413 3725 y(local-n)o(umber-digits)155
b(=)99 b(1*phonedigit-he)m(x)413 3838 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 3951 y(domainlabel)430 b(=)99
b(alphan)o(um)1488 4064 y(/)26 b(alphan)o(um)c(*\()k(alphan)o(um)d(/)i
(\224-\224)h(\))g(alphan)o(um)413 4177 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 4290 y(par)o(ameter)508 b(=)99 b(\224;\224)26
b(pname)e([\224=\224)i(pv)n(alue)e(])413 4403 y(pname)643
b(=)99 b(1*\()26 b(alphan)o(um)c(/)k(\224-\224)g(\))413
4516 y(pv)n(alue)656 b(=)99 b(1*par)o(amchar)413 4629
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 4742 y(unreser)s(v)n(ed)466
b(=)99 b(alphan)o(um)23 b(/)i(mar)q(k)413 4854 y(escaped)578
b(=)99 b(\224\045\224)26 b(HEXDIG)e(HEXDIG)413 4967 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
5080 y(phonedigit)501 b(=)99 b(DIGIT)25 b([)h(visual-separ)o(ator)f(])
413 5193 y(phonedigit-he)m(x)327 b(=)99 b(HEXDIG)24 b([)i(visual-separ)
o(ator)f(])413 5306 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 5419 y(alphan)o(um)522 b(=)99 b(ALPHA)24
b(/)h(DIGIT)0 5453 y
-31.0 Resolution mul 72.27 div /CBarX4 exch def currentpoint exch
pop /CBarY4 exch def
0 5453 a 0 5453 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX3 CBarY3 moveto CBarX4 CBarY4 lineto stroke grestore
0 5453 a 203 x
Fk(H.)18 b(Schulzrinne/A.)h(V)-8 b(aha-Sipila)1008 b
Fl(Expires)24 b(June)g(2003)1010 b([P)o(age)23 b(4])p
eop
%%Page: 5 5
5 4 bop 0 100 a Fl(INTERNET)-8 b(-DRAFT)736 b(draft-antti-rfc2806)q(bi)
q(s-0)q(8.ps)725 b(February)25 b(19,)e(2003)0 307 y
-31.0 Resolution mul 72.27 div /CBarX3 exch def currentpoint exch
pop /CBarY3 exch def
0
307 a 0 307 a
-31.0 Resolution mul 72.27 div /CBarX4 exch def currentpoint exch
pop /CBarY4 exch def
0 307 a 0 307 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX3 CBarY3 moveto CBarX4 CBarY4 lineto stroke grestore
0 307 a 141 399 a Fl(Each)29
b(parameter)i(name)f(\(\223pname\224\),)i(the)e(ISDN)e(subaddress,)33
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(O)q(T)e Fl(ap-)0 490 y(pear)c(more)g(than)g(once.)41
b(The)27 b(order)h(of)g(the)g(URL)d(parameters)k(is)f(immaterial.)41
b(The)27 b(ISDN)f(subaddress)31 b(or)c(e)o(xtension)2
581 y Fd(S)t(H)t(O)t(U)t(L)t(D)d Fl(appear)f(\002rst,)f(if)f(present,)i
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(follo)n(wed)g(by)e(an)o(y)h(other)h(param-)0 672 y(eters)h(in)g(le)o
(xicographical)k(order)-5 b(.)339 796 y Fk(This)19 b(simpli\002es)f
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0 1088 y Fj(4)119 b(URI)30 b(Comparisons)0 1295 y Fl(T)-7
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(to)d(the)h(follo)n(wing)h(rules:)136 1504 y Fc(\017)46
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Fh(local-n)o(umber)d Fl(and)j(the)g(other)g(a)f Fh(global-n)o(umber)p
Fl(.)136 1690 y Fc(\017)46 b Fl(F)o(or)18 b(mandatory)i(e)o(xtension)h
(parameters)f(and)f(the)g Fh(phone-conte)m(xt)d Fl(and)j
Fh(e)m(xtension)e Fl(parameters)j(de\002ned)f(in)g(this)227
1803 y(document,)32 b Fh(phone-n)o(umber)25 b Fl(parameter)31
b(v)n(alues)g(are)e(compared)i(digit-by-digit)i(after)d(remo)o(ving)h
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(consideration.)136 2102 y Fc(\017)46 b Fl(P)o(arameters)30
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(of)d(the)i(order)f(the)o(y)g(appeared)i(in)e(the)g(URI.)e(If)227
2215 y(one)d(URI)f(has)g(a)h(parameter)h(name)e(not)h(found)h(in)f(the)
f(other)l(,)i(the)f(tw)o(o)f(URIs)g(are)g(not)h(equal.)136
2402 y Fc(\017)46 b Fl(URI)23 b(comparisons)j(are)e(case-insensiti)n(v)
o(e.)141 2589 y(All)h(parameter)j(names)e(and)g(v)n(alues)j
Fd(S)t(H)t(O)t(U)t(L)t(D)g Fl(use)d(lo)n(wer)n(-case)h(characters)i
(since)d(tel)g(URIs)f(may)g(be)h(used)h(within)0 2680
y(conte)o(xts)e(where)f(comparisons)i(are)e(case-sensiti)n(v)o(e.)339
2804 y Fk(Section)19 b(19.1.4)h(in)e(the)h(SIP)f(speci\002cation)h([7)q
(])f(discusses)i(one)g(such)f(case.)0 3096 y Fj(5)119
b(Phone)31 b(Numbers)f(and)h(Their)g(Context)0 3306 y
Fi(5.1)99 b(Phone)26 b(Numbers)0 3480 y Fl(The)20 b Fh(subscr)q(iber)h
Fl(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 3593 y(\(E.164\))k(or)g(local)h(notation.)39
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3706 y(as)g(such.)37 b(Numbers)27 b(from)f(pri)n(v)n(ate)h(numbering)h
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2124 y(de\002ned,)24 b(b)n(ut)g(is)g(not)f(prohibited.)0
2370 y Fg(5.1.3)92 b(Global)23 b(Numbers)0 2544 y Fl(Globally)28
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(\223+\224)e(character)-5 b(.)41 b(Global)28 b(numbers)i
Fd(M)t(U)t(S)t(T)g Fl(be)d(composed)0 2657 y(with)d(the)g(country)h
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2770 y(numbers)f(ha)n(v)o(e)f(the)g(property)i(of)d(being)i
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Fd(R)t(E)t(C)t(O)t(M)t(M)t(E)t(N)t(D)t(E)t(D)r Fl(.)0
2789 y
-31.0 Resolution mul 72.27 div /CBarX5 exch def currentpoint exch
pop /CBarY5 exch def
0 2789 a 227 x Fg(5.1.4)92 b(Local)24 b(Numbers)0
3190 y Fl(Local)e(numbers)h(are)f(unique)h(only)f(within)g(a)g(certain)
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i(netw)o(ork,)0 3303 y(e.g.,)e(a)h(pri)n(v)n(ate)h(branch)g(e)o
(xchange)i(\(PBX\),)21 b(a)h(state)i(or)f(pro)o(vince,)i(a)d
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(entities)h(can)0 3529 y(successfully)g(set)c(up)g(the)h(call)f(by)h
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(numbers.)30 b(Local)24 b(numbers)j Fd(S)t(H)t(O)t(U)t(L)t(D)h(N)t(O)q
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(cannot)h(be)227 4156 y(ruled)20 b(out.)141 4327 y Fl(Local)29
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4553 y(Thus,)29 b(the)g(combination)i(of)d(an)o(y)h(one)g(of)f(the)h
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b(The)26 b(parameter)i(v)n(alue)g(is)e(de\002ned)h(by)g(the)g(assignee)
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(global)i(\(E.164\))f(number)-5 b(.)141 5005 y(There)27
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b(via)28 b(a)e(global)j(number)f(or)f(an)o(y)g(number)h(of)f(its)g
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(domain)h(name,)h(e.g.,)f(\223houston.e)o(xample.com\224.)59
b(The)31 b(choice)j(between)f(the)f(tw)o(o)g(is)g(left)g(to)g(the)0
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-31.0 Resolution mul 72.27 div /CBarX6 exch def currentpoint exch
pop /CBarY6 exch def
0 5363
a 0 5363 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX5 CBarY5 moveto CBarX6 CBarY6 lineto stroke grestore
0 5363 a 293 x Fk(H.)18 b(Schulzrinne/A.)h(V)-8
b(aha-Sipila)1008 b Fl(Expires)24 b(June)g(2003)1010
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q(s-0)q(8.ps)725 b(February)25 b(19,)e(2003)0 307 y
-31.0 Resolution mul 72.27 div /CBarX5 exch def currentpoint exch
pop /CBarY5 exch def
0
307 a 141 399 a Fl(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
Fd(M)t(U)t(S)t(T)g Fl(be)e(under)g(the)f(administrati)n(v)o(e)0
511 y(control)25 b(of)f(the)g(entity)g(managing)i(the)d(local)i(phone)g
(conte)o(xt.)141 624 y(A)33 b(global)i(number)g(conte)o(xt)h(consists)g
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b(.)61 b(All)33 b(global)j(numbers)0 737 y(matching)c(these)g(initial)g
(digits)g(must)f(be)g(assigned)i(to)e(the)g(same)f(or)n(ganization)35
b(that)c(is)g(describing)i(the)e(conte)o(xt)i(and)0 850
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b(number)f(conte)o(xt,)h(b)n(ut)f(+1-212-939-7000)29
b(w)o(ould)24 b(w)o(ork.\))141 1415 y(It)f(is)h(not)g(required)h(that)f
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(the)h(chosen)h(set)f(of)g(initial)g(numbers.)141 1528
y(F)o(or)h(a)h(local)h(number)g(de\002ned)f(within)h(a)f(PBX,)d(the)k
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(control)g(to)0 1641 y(identify)g(the)f(conte)o(xt.)35
b(F)o(or)24 b(e)o(xample,)i(a)f(conte)o(xt)i(consisting)h(of)d(an)o(y)g
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g(the)f(local)0 2318 y(number)27 b(will)f(generate)j(a)c(v)n(alid)i
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(reachable)f(from)0 2657 y(outside)31 b(a)d(particular)k(country)f
(code)f(or)f(numbering)i(plan.)46 b(Recall)30 b(that)f(\223tel\224)h
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3102 y(the)h(particular)g(country)h(code.)0 3176 y
-31.0 Resolution mul 72.27 div /CBarX6 exch def currentpoint exch
pop /CBarY6 exch def
0
3176 a 0 3176 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX5 CBarY5 moveto CBarX6 CBarY6 lineto stroke grestore
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3401 y(reasonably)f(descripti)n(v)o(e)f(and)h(does)f(not)g(require)g(a)
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b(It)19 b(is)g(up)h(to)f(the)h(administrator)g(to)227
3492 y(assign)f(an)f(appropriate)h(identi\002er)f(and)h(to)f(use)g(it)f
(consistently)-5 b(.)24 b(Often,)18 b(an)g(or)o(ganization)h(can)f
(choose)i(among)f(se)n(v)o(eral)f(dif)n(ferent)227 3583
y(identi\002ers.)141 3754 y Fl(If)23 b(the)g(recipient)i(of)e(a)f
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4206 y(N)t(O)q(T)j Fl(initiate)f(the)f(call)g(and)g(treat)g(the)g(URI)e
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-31.0 Resolution mul 72.27 div /CBarX7 exch def currentpoint exch
pop /CBarY7 exch def
0 4762 a 229 x Fi(5.3)99 b(Extensions)0 5166 y
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-31.0 Resolution mul 72.27 div /CBarX8 exch def currentpoint exch
pop /CBarY8 exch def
0 5411 a 0 5411 a
gsave 65 100 div setgray 2.0 Resolution mul 72.27 div setlinewidth
CBarX7 CBarY7 moveto CBarX8 CBarY8 lineto stroke grestore
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%%Trailer
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userdict /end-hook known{end-hook}if
%%EOF