# Digital E&M Voice Mail Interface

## Overview

Digital E&M voice mail functionality provides voice processors with the ability to transfer calls through the digital E&M interface by flashing on the E-lead. Calls rerouted to the voice processor can only be identified by making use of ARS and digit modification. ONS ports may be installed to achieve Callback message functionality. See ONS Voice Mail Interface.

Type I or V E&M trunks may be used. T1-E&M type trunks do have the flash ability for call transfer.

## Conditions and Feature Interactions

- Voice mail ports within a "voice mail" type hunt group may be dedicated to message activation/deactivation by assigning and applying a separate Class of Service option.

- Class of Service option ONS/COV/E&M Voice Mail Port must be enabled for members of a "voice mail" type hunt group.

- Attendant consoles are unable to receive a message waiting indication.

- Single line sets without message waiting lamps require Message Waiting Audible Tone Notification COS option enabled.

- Message waiting indications activated from an E&M voice mail port are considered to be Dialed message waiting type messages. These messages can be deactivated from any E&M voice mail port or any system port which is not in a "voice mail" type hunt group.

- Voice mail ports may be assigned to multiple voice mail hunt groups.

- Digital E&M voice mail functionality is not supported on the EX Controller.

## Programming

To program a Digital E&M interface:

1. Trunk Circuit Descriptors - Digital E and M form

Program the following:

- Address Signaling: DTMF

- Incoming Start Type: Wink or IMM

- Minimum Flash Timer (100-250 ms): 100

- Maximum Flash Timer (200-250 ms): 250

- Outgoing Start Type: Wink or IMM

- Fake Answer Supervision After Outpulsing: Yes

- Ignore Answer Supervision: Yes

- Release Supervision Expected: Yes

- Audio Inhibit Until Answer Supervision: No

- Drop Digit Rcvr for Outgoing Audio Before Ans Sup: No

2. Class of Service Options form

Program the following parameters for the E&M voice mail ports:

- ONS/COV/E&M Voice Mail Port: Yes

- Dialed Night Service: Yes (optional)

- Message Waiting: Yes

- Dialing Conflict Timer (2-5 s): 2 (optional)

3. Trunk Attributes form

- Apply the relevant Class of Service (COS) and Class of Restriction (COR) to the E&M voice mail ports.

- Enter "0" in the "Absorb" field. Toll fraud should be considered when assigning a COR to the voice mail ports. External dialing may be required for pager notification or message forwarding.

4. Digital Trunks ( ) and Trunk Groups ( ) forms

- Program the E&M trunks to use circular hunting.

5. ARS Call Progress Tone Detection form

Program the following parameters:

- Maximum Wait For Dial Tone (0-99 s): 5

- Tone Plan Number: 01

- Action On Timeout: outpulse default

The maximum wait for dial tone should be adjusted on each installation. This allows the voice processor time to answer before further digits are outpulsed.

6. ARS Digit Modification Plans ( ) and Class of Service Options ( ) forms

Program as follows:

Number of Digits to Absorb | Digits to be Inserted
1 | <T01>*
1 | <T01>*<E> (optional for message retrieval and analog networking)
It may be necessary to insert a tone (for example, * or #) after the tone plan, if the voice mail ports are configured to provide automated attendant functionality. The tone required will put the voice processor into telephone answering mode.

7. ARS Routes form

- Program the form and reference the relevant trunk group and digit modification numbers. Digits before outpulsing can be set to eliminate overlap outpulsing, but should not be required.

8. ARS Leading Digits form

Program the following parameters:

Leading Digits: 8
Second Dial Tone: NO
COR Group Number

9. ARS Digits Dialed form

Program the following 3 sets of parameters:

Digits Dialed |  | * | *
Number of Digits to follow | 4 | 4 | 0
Terminated Type Route | Route | Route | Route
Termination Number | 01 | 01 | 02
The first ARS entry is used for call rerouting. The second ARS entry defines the message retrieval route if required. The "*" is also sent, assuming the voice mail will respond by prompting the subscriber to enter their mailbox number. "Digits to follow" is defined by the actual extension number's digit length.

10. Feature Access Codes form

- Assign message waiting activate and deactivate codes.

- (Optional) Assign access codes to Dialed Day/Night Service Inquire and Message Waiting Inquire if used by the voice processor.

11. Class of Service Options form

Program the following for the customer extensions:

- Call Forwarding (External Destination): Yes

- Message Waiting Audible Tone Notification: Yes (optional)

- Multiline Set Voice Mail Callback Message Erasure Allowed: No (optional)

- Call Forward No Answer Timer (0-125 s): 15 (default)

Subscribers will call forward to the ARS leading digit followed by the users extension number (for example, ARS Leading Digit 8 and User Extension Number 5000).

System call rerouting may also be used. Simply reroute extensions to a system speed call number containing the above ARS leading digit and user extension number.

## Operation

Telephone Answering

Using E&M trunk circuits for voice mail applications requires that the subscriber be identified to the voice processor via Automatic Route Selection (ARS) using digit modification. Calls are rerouted externally through ARS where the leading digit is absorbed, pauses and any necessary tones are inserted and then the subscriber's mailbox number is outpulsed to the voice processor providing the proper personal greeting for message taking.

If the voice processor ports are configured as an auto attendant, insert another tone in front of the subscriber's mailbox number to put the voice processor into telephone answering mode.

Message Waiting

Message waiting indications can be set from the E&M voice processor circuits by dialing the message waiting activate/deactivate feature access codes assigned on the system followed by the subscriber's extension number.

Message Retrieval

Subscribers will retrieve voice mail messages by accessing an ARS route and dialing their extension number. Digit modification will absorb the leading digit, insert a pause and any other necessary tones followed by the extension number dialed. The subscriber will be prompted for their password.

"Advanced Analog Networking" would enhance message retrieval. ARS modify digits could insert the internal calling extension number automatically (that is <E>). Subscribers would simply dial a defined ARS digit string for message retrieval.

Messages can be retrieved external to the system dependent on incoming trunk access to the voice processor. Usually, subscribers will have to manually enter one or two digits followed by their mailbox number to log into their mailbox.

Display sets may "read" and "call" messages if activated from an ONS "voice mail" type hunt group.

Auto Attendant

Voice processors can perform auto attendant functions by flashing the E&M trunk on the system E-lead. Incoming trunks may be directed to a system speed call number containing the ARS digits necessary to access the voice processor, allowing users to transfer to valid destinations through the system.

Since most subscriber extensions will be call rerouted busy/no answer to voice mail; it is recommended that you program the voice processor to perform an unscreened transfer to provide most efficient use of the voice mail ports.

Related Topics

- About Embedded Voice Mail

- External Voice Mail

- ONS Voice Mail Interface