* (LASS) Codes
LASS codes are numbers you enter on your telephone touch-pad to access special features of the telephone system.
The most well-known LASS codes are *67 to toggle Caller-ID blocking and *69, for Call Return.
Local Area Signalling Services (LASS) and Custom Calling Feature Control Codes:
Service Tone Pulse Notes
| 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]/td> |
| 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
LASS codes 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
At one time LASS Codes were called CLASS Codes, for Custom Local Area Signalling Services.
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