184:
130:
134:
225:
249:
112:
254:
244:
145:
139:
64:
is an office where assistance in completing incoming calls is provided in addition to other traffic; a toll center designated
218:
32:
169:
40:
36:
211:
44:
73:
50:
191:
69:
20:
105:
195:
54:
238:
183:
149:
155:
92:
57:
68:
is an office where operators handle only outbound calls, or where
199:
53:
or participation may be an optional function. In U.S.
43:
as the first stage of concentration for intertoll or
219:
8:
226:
212:
85:
7:
180:
178:
198:. You can help Knowledge (XXG) by
60:service, a toll center designated
14:
182:
133: This article incorporates
128:
118:from the original on 2022-10-09.
146:General Services Administration
1:
16:Element of American telephony
250:Telecommunications economics
271:
177:
106:"4A Toll Switching System"
255:Telecommunications stubs
190:This article related to
170:Class-4 telephone switch
93:The Digital Future, 1979
245:Communication circuits
141:Federal Standard 1037C
135:public domain material
154: (in support of
95:Toll connecting trunk
72:is performed without
29:toll connecting trunk
25:toll switching trunk
74:operator assistance
51:Operator assistance
192:telecommunications
21:telecommunications
207:
206:
262:
228:
221:
214:
186:
179:
159:
153:
148:. Archived from
132:
131:
120:
119:
117:
110:
102:
96:
90:
270:
269:
265:
264:
263:
261:
260:
259:
235:
234:
233:
232:
175:
166:
138:
129:
127:
124:
123:
115:
108:
104:
103:
99:
91:
87:
82:
17:
12:
11:
5:
268:
266:
258:
257:
252:
247:
237:
236:
231:
230:
223:
216:
208:
205:
204:
187:
173:
172:
165:
162:
161:
160:
152:on 2022-01-22.
122:
121:
97:
84:
83:
81:
78:
55:common carrier
35:connecting an
15:
13:
10:
9:
6:
4:
3:
2:
267:
256:
253:
251:
248:
246:
243:
242:
240:
229:
224:
222:
217:
215:
210:
209:
203:
201:
197:
193:
188:
185:
181:
176:
171:
168:
167:
163:
157:
151:
147:
143:
142:
136:
126:
125:
114:
107:
101:
98:
94:
89:
86:
79:
77:
75:
71:
67:
63:
59:
56:
52:
48:
46:
45:long-distance
42:
38:
34:
30:
26:
22:
200:expanding it
189:
174:
150:the original
140:
100:
88:
65:
61:
49:
28:
24:
18:
156:MIL-STD-188
47:traffic.
41:toll center
239:Categories
80:References
37:end office
70:switching
58:telephony
164:See also
113:Archived
66:Class 4P
62:Class 4C
194:is a
137:from
116:(PDF)
109:(PDF)
39:to a
33:trunk
31:is a
196:stub
23:, a
27:or
19:In
241::
158:).
144:.
111:.
76:.
227:e
220:t
213:v
202:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
