42:
for plant testing. Central office code 958 is intended for communications between switching centers. Central office code 959 with three or four additional digits is dedicated for access to office test lines in local exchange carrier (LEC) and interoffice carrier (IC) central offices. The
209:
23:
is a telephone number reserved for use by telephone installers or other workers to test an individual telephone line. Test numbers are typically unlisted.
184:
90:
Linetest
Facilities (for example) are available by ringing 17070 and a self-service test facility for subscribers is no longer available.
43:
specifications define several test features for line conditions, such as quiet line and busy line, and test tones transmitted to callers.
240:
50:
216:
79:, which causes the calling telephone to ring to verify an installation is working and the phone number routing properly.
265:
27:
119:
260:
188:
109:, Telcordia Technologies, Special Report SR-2275 Issue 4 (October 2000), Section 8.2.5, p.8-8
166:
Plant test exchange prefixes appear in the list of CO Code assignments (per area code) at
8:
234:
70:
87:
76:
62:
254:
143:
56:
66:
69:
sinusoidal test tone used to measure line quality and
120:"TUCoPS :: Phreaking Caller ID :: anac.txt"
16:
Telecommunication facility for telephone line testing
174:(Canada) but the individual numbers are unpublished.
167:
171:
252:
53:, a machine which announces the caller's number
46:The tests available for plant testing include
100:
83:Some localities reserve only 958 or 959.
253:
239:: CS1 maint: archived copy as title (
51:Automatic number announcement circuit
65:, a standardized 1004 Hz, zero
59:, a primitive conference call bridge
86:Each country uses different codes.
13:
14:
277:
202:
177:
160:
136:
112:
107:Telcordia Notes on the Network
30:(NANP) reserves the exchange (
1:
93:
28:North American Numbering Plan
7:
10:
282:
19:In telecommunications, a
185:"BT line test facility"
266:Communication circuits
124:www.artofhacking.com
261:Telephone numbers
73:between stations.
71:transmission loss
21:plant test number
273:
245:
244:
238:
230:
228:
227:
221:
215:. Archived from
214:
206:
200:
199:
197:
196:
187:. Archived from
181:
175:
168:http://nanpa.com
164:
158:
157:
155:
154:
140:
134:
133:
131:
130:
116:
110:
104:
281:
280:
276:
275:
274:
272:
271:
270:
251:
250:
249:
248:
232:
231:
225:
223:
219:
212:
210:"Archived copy"
208:
207:
203:
194:
192:
183:
182:
178:
165:
161:
152:
150:
142:
141:
137:
128:
126:
118:
117:
113:
105:
101:
96:
77:Ringback number
17:
12:
11:
5:
279:
269:
268:
263:
247:
246:
201:
176:
172:http://cnac.ca
159:
135:
111:
98:
97:
95:
92:
81:
80:
74:
63:Milliwatt test
60:
54:
32:central office
15:
9:
6:
4:
3:
2:
278:
267:
264:
262:
259:
258:
256:
242:
236:
222:on 2013-09-02
218:
211:
205:
191:on 2013-11-11
190:
186:
180:
173:
169:
163:
149:
145:
139:
125:
121:
115:
108:
103:
99:
91:
89:
84:
78:
75:
72:
68:
64:
61:
58:
55:
52:
49:
48:
47:
44:
41:
37:
33:
29:
24:
22:
224:. Retrieved
217:the original
204:
193:. Retrieved
189:the original
179:
162:
151:. Retrieved
148:home.ptd.net
147:
144:"Loop Lines"
138:
127:. Retrieved
123:
114:
106:
102:
85:
82:
45:
39:
35:
31:
25:
20:
18:
57:Loop around
34:) prefixes
255:Categories
226:2013-11-11
195:2013-11-11
153:2020-02-13
129:2020-02-13
94:References
170:(US) and
235:cite web
220:(PDF)
213:(PDF)
241:link
38:and
26:The
67:dBm
40:959
36:958
257::
237:}}
233:{{
146:.
122:.
88:BT
243:)
229:.
198:.
156:.
132:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.