Special Centrex tones You will hear certain tones as you use the various Centrex features. Dial Tone:

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1 AT&T Centrex Date: 7/21/09 Customer Instruction Kit Dial 9 Welcome To Centrex Congratulations on your selection of a new customized communications system ATT Centrex. With Centrex, your business will enjoy a truly functional, flexible, and reliable telecommunications system without the major expense of installing and maintaining additional equipment. Centrex works with most of the office phones you already have and gives you new capabilities. The way you activate your Centrex features may vary, however, depending on the type of telephone set you use. Your Centrex Dialing Plan To call another Centrex station: Enter last 4 digits of telephone number. To place outside calls, enter: Local: 9 + phone number. Toll: area code and number. To call an operator, enter: AT&T operator Long-distance operator To report telephone trouble, enter Special Centrex tones You will hear certain tones as you use the various Centrex features. Dial Tone: Continuous steady tone

2 Confirmation Tones: 3 short bursts followed by a steady tone. 2 short bursts followed by a steady tone. 2 short bursts followed by ringing or a busy signal. Fast Busy Tone: Faster than normal busy signal. Hang up and try your call again. Distinctive Ringing/Call Waiting Tone are optional features that help you identify the type of call coming in on your Centrex line. One short ring or beep indicates a call from another Centrex station. Two short rings or beeps indicate a call from outside the system. Three rings or beeps indicate a priority The key to using Centrex features is the Feature button on your telephone set. When using the Feature button, press it briefly, then release. The feature button may be labeled in a number of different ways. It may be called Flash, Tap, Link, Recall, Hook Flash, or Transfer. On phones without a labeled feature button of any kind: Press the receiver button. You will see Enter throughout these instructions. Fill in the blanks with the code (e.g., * 76) you use to activate that particular feature. If you are not sure what codes to use at your location, call your SBC account representative or business office.

3 Centrex Instructions The following instructions explain how to use AT&T Centrex features, which give you a wide variety of capabilities for your business. CALL TRANSFER To transfer a call inside or outside your Centrex: Enter number where call should be transferred;* you may hang up as soon as the line rings,** or when answered, announce call and hang up. * Enter the number exactly as if you were calling the number directly. ** If busy, no answer, or wrong number, press Feature button twice to return to original THREE-WAY CALLING To add a third party to a call: Enter number of third party. When third party answers* press Feature button; three-way call is now connected. * If busy, no answer, or wrong number, press Feature button twice to return to original CALL HOLD To place a call on hold and make another call: Enter 112; at dial tone, call is on hold. To make another call, enter new number.* To return to call on hold: Hang up; set rings with first call on the line. * To alternate between calls, press Feature button, wait for dial tone and enter 112.

4 CONSULTATION HOLD To place a call on hold to make another call: Enter number for second call; when call is answered,* consult with other party. To end second call, press Feature button twice to return to original Note: Consultation Hold is a temporary hold to be used for consultation purposes only. It should not be used as a substitute for Call Hold. * If busy, no answer, or wrong number, press Feature button twice to return to original CALL FORWARDING To forward calls inside or outside your Centrex: Obtain dial tone. Enter 142; wait for dial tone. Enter number where calls will be forwarded.* When call is answered,**advise that calls will be forwarded and hang up. To cancel Call Forwarding: Obtain dial tone. Enter 143; wait for dial tone and hang up. * Enter the number exactly as if you were calling the number directly. (Within your centrex 4 digit dialing, outside of your centrex dial 9 + number you are dialing). ** If forwarding number is busy or unanswered: For inside Centrex numbers, hang up; your calls will be forwarded. For outside Centrex numbers, hang up; repeat steps above. CALL PICKUP To answer a ringing line in your Call Pickup Group from an idle line: Obtain dial tone. Enter 113; call transfers to your line. To answer a ringing line while on a call: Enter 113; call transfers to your line and first call is automatically on hold.* * To return to original call, hang up; set rings with first call on the line.

5 CONFERENCE CALLING To include up to six people in a conference call: Obtain dial tone. Enter 116; wait for dial tone. Enter first number;* when answered, announce conference (FEATURE NOT CURRENTLY ACTIVE ON THE CENTREX IN 529 PREFIX) To add each new person: Enter number;**when answered, announce conference Press Feature button; all parties are connected. * If busy, no answer, or wrong number hang up and begin again. ** If busy, no answer, or wrong number hang up. Set rings with conference call on the line. AUTOMATIC CALLBACK To access feature, station user: o Goes off-hook and listens for dial tone o Dials Call Return activation code o If remote number is idle, then the call will complete o If remote number is busy: Call Return will attempt to complete a call every 45 seconds, for up to 30 minutes o Standard codes for Call Return are: - *69 to activate feature - *89 to deactivate all Call Return requests Selective Unblocking: *82 Selective Blocking : *67 Call Trace: *57 Call Screen: *60