Local Area Signalling Services (LASS) and Custom Calling Feature
Control Codes:
Service Tone Pulse/rotary Notes
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Assistance/Police *12 n/a [1]
Cancel forwarding *30 n/a [C1]
Automatic Forwarding *31 n/a [C1]
Notify *32 n/a [C1] [2]
Intercom Ring 1 (..) *51 1151 [3]
Intercom Ring 2 (.._) *52 1152 [3]
Intercom Ring 3 (._.) *53 1153 [3]
Extension Hold *54 1154 [3]
Customer Originated Trace *57 1157
Selective Call Rejection *60 1160 (or Call Screen)
Selective Distinct Alert *61 1161
Selective Call Acceptance *62 1162
Selective Call Forwarding *63 1163
ICLID Activation *65 1165
Call Return (outgoing) *66 1166
Number Display Blocking *67 1167 [4]
Computer Access Restriction *68 1168
Call Return (incoming) *69 1169
Call Waiting disable *70 1170 [4]
No Answer Call Transfer *71 1171
Usage Sensitive 3 way call *71 1171
Call Forwarding: start *72 or 72# 1172
Call Forwarding: cancel *73 or 73# 1173
Speed Calling (8 numbers) *74 or 74# 1174
Speed Calling (30 numbers) *75 or 75# 1175
Anonymous Call Rejection *77 1177 [5] [M: *58]
Call Screen Disable *80 1180 (or Call Screen) [M:*50]
Selective Distinct Disable *81 1181 [M: *51]
Select. Acceptance Disable *82 1182 [4] [7]
Select. Forwarding Disable *83 1183 [M: *53]
ICLID Disable *85 1185
Call Return (cancel out) *86 1186 [6] [M: *56]
Anon. Call Reject (cancel) *87 1187 [5] [M: *68]
Call Return (cancel in) *89 1189 [6] [M: *59]
Notes:
[C1] - Means code used for Cellular One service
[1] - for cellular in Pittsburgh, PA A/C 412 in some areas
[2] - indicates that you are not local and maybe how to reach you
[3] - found in Pac Bell territory; Intercom ring causes a
distinctive ring to be generated on the current line; Hold
keeps a call connected until another extension is picked up
[4] - applied once before each call
[5] - A.C.R. blocks calls from those who blocked Caller ID
(used in C&P territory, for instance)
[6] - cancels further return attempts
[7] - *82 (1182) has been mandated to be the nationwide code for
"Send CLID info regardless of the default setting on this
phone line."
[M: *xx] - alternate code used for MLVP (multi-line variety package)
by Bellcore. It goes by different names in different RBOCs.
In Bellsouth it is called Prestige. It is an arrangement of
ESSEX like features for single or small multiple line
groups.
The reason for different codes for some features in MLVP is
that call-pickup is *8 in MLVP so all *8x codes are
reassigned *5x
These appear to be standard, but may be changed locally
Under GTE, some LASS/CLASS tones may be changed from *NN to NN#. Under
pulse, GTD5 allows either NN or 11NN, but with 11NN it may
conflict with a test number.
At one time these were called CLASS Codes, for Custom Local Area
Signalling Services.