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Telephony Signaling

Understanding E&M Voice Interface Cards

Document ID: 7937

Updated: Feb 02, 2006

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Introduction

An Ear and Mouth (E&M) interface supports tie-line facilities or signals between telephone switches. You can use the E&M voice interface card (VIC) to integrate VoIP with the legacy voice solution. The E&M VIC connects the Cisco router to a PBX.

In order to troubleshoot, refer to the TAC Case Collection (registered customers only) tool.

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Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on these E&M VICs:

  • VIC-2E/M

  • VIC2-2E/M

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Product Numbers

  • VIC-2E/M—Two-port E&M VIC

  • VIC2-2E/M—Two-port E&M VIC*

Note: * “VIC2” indicates a next-generation VIC, with component refresh. VIC-2E/M is not supported in the Cisco IP Communications Voice/Fax Network Modules (NM-HD-1V, NM-HD-2V and NM-HD-2VE). VIC2-2E/M should be used with them. Refer to the Voice Hardware Compatibility Matrix for more information.

Features

VIC-2E/M

Feature Description
Voice ports Two E&M ports
Connections Supports two-wire and four-wire E&M signaling types I, II, III, and V via RJ-45/RJ48S connectors. Both ports must use the same signaling type. For E&M VIC pinouts, refer to the VIC-2E&M Pinout section of the document E&M Cable Pinouts to Connect Cisco 1750/2600/3600 E&M VIC to Nortel PBX Option 11 E&M Trunk.
Cisco IOS® Software Release Requires Cisco IOS Software Release 11.3(1)T or later For Australia, requires Cisco IOS Software Release 11.3(6)T Requires a "Plus" feature set

VIC2-2E/M

Feature Description
Voice ports Two E&M ports
Connections Supports two-wire and four-wire, E&M signaling types I, II, III, V via RJ-45/RJ48S connectors. Both ports must use the same signaling type. For E&M VIC pinouts, refer to the VIC-2E&M Pinout section of E&M Cable Pinouts to Connect Cisco 1750/2600/3600 E&M VIC to Nortel PBX Option 11 E&M Trunk.
Cisco IOS Software Release Requires Cisco IOS Software Release 12.2(15)ZJ, 12.3(4)T, and later Requires a "Plus" feature set

Configuration

Refer to Voice over IP for the Cisco 3600 Series for the configuration of voice features in Cisco IOS Software.

Note: In Cisco IOS Software, use the global configuration command voice-port slot/VIC slot/unit in order to configure the voice port parameters.

Before you configure the VIC E&M, be sure you understand the different interface types and wiring arrangements that an E&M port can have. E&M interface types can be type I, II, III, or V. Cisco platforms do not support type IV. Wiring arrangements can be two or four wires. Refer to Understanding and Troubleshooting Analog E&M Interface Types and Wiring Arrangements for more information.

Also, you need to understand the different types of Start Dial Supervision signaling that an E&M port can have. Start Dial Supervision is the line protocol that defines how the equipment seizes the E&M trunk and passes the address signaling information. The equipment sends dual tone multifrequency (DTMF) digits in order to pass the address information. On E&M circuits, the three main Start Dial Supervision protocols are:

  • Immediate Start

  • Wink Start

  • Delay Dial

Refer to Understanding and Troubleshooting Analog E&M Start Dial Supervision Signaling for more information.

The commands to configure the voice port are:

Router(config-voiceport)# ?
  busyout          Configure busyout monitoring parameters
  comfort-noise    Use fill-silence option
  connection       Specify Trunking Parameters
  cptone           Configure voice call progress tone locale
  dial-type        Configure type of dialer for voice
  echo-cancel      Echo-cancellation option
  impedance        Specifies the terminating impedance of the interface
  input            Configure input gain for voice
  music-threshold  Threshold for Music on Hold
  non-linear       Use non-linear processing during echo cancellation
  operation        Specify the operation of the E&M signal
  output           Configure output attenuation for voice
  shutdown         Take voice-port offline
  signal           Configure signal parameters
  snmp             Modify SNMP voice port parameters
  timeouts         Configure voice timeout parameters
  timing           Configure voice timing parameters
  type             Specifies the E&M interface type

The most important parameters are:

  • cptone

  • dial-type

    • dtmf—touch-tone dialer

    • pulse—pulse dialer

  • impedance

    • 600c

    • 600r

    • 900c

    • complex1

    • complex2

  • operation

    • two-wire operation

    • four-wire operation

  • signal

    • delay-dial

    • immediate

    • wink-start

  • type

    • E&M type I

    • E&M type II

    • E&M type III

    • E&M type V

The commands to configure VoIP on Cisco routers are very similar on all the router platforms that the Platform Support section of this document shows. Refer to the Command Lookup Tool (registered customers only) for more information on the commands in this document.

Refer to the Fine-Tuning E&M Voice Ports section of Configuring Voice Ports for Voice over IP to fine-tune E&M voice ports.

Refer to Analog E&M Troubleshooting Guidelines (Cisco IOS Platforms) in order to troubleshoot.

Platform Support

VIC-2E/M

The table in this section shows the platforms that support the various E&M VICs. The table includes Cisco IOS Software release support selection.

Note: The original VIC works in Cisco NM-1V and NM-2V network modules, and VIC2 works in NM-HD-1V, NM-HD-2V, NM-HD-2VE, and NM-HDV2. These are not interchangeable.

Cisco IOS Software Support1 1750, 1751, 1760 ICS 7700/7750 VG200 2600, 2600XM, 2650XM, 2691 3620, 36402 36602 3725, 3745
Carrier Module Not Required Not Required NM-1V/ NM-2V NM-1V/ NM-2V NM-1V / NM-2V NM-1V/ NM-2V NM-1V/ NM-2V
VIC-2E/M1,2 All Cisco IOS Software releases Cisco IOS Software Release 12.2(8)YL, 12.2(8)YM, 12.2(8)YN, 12.2(11)YU, 12.2(11)YV, 12.2(13)ZH, 12.2(15)ZL, 12.3(2)XA All Cisco IOS Software releases All Cisco IOS Software releases Cisco IOS Software Release 11.3(1)T, 12.0(1)T, 12.0(1), 12.0(2)T, 12.0(3)T, 12.0(7)T, 12.1(1)T, 12.1(1), 12.1(5)YB, 12.2(1), 12.2(2)T, 12.2(15)ZJ, 12.3(1) All Cisco IOS Software releases All Cisco IOS Software releases

1Voice requires a Cisco IOS "Voice" feature set on the Cisco 1700 series and "Plus" feature set on the Cisco 2600/3600/3700 series.

2The 3631 does not support voice. Neither the Cisco Catalyst 4500/4000 or Catalyst 6500/6000 series switches support VIC-2E/M.

Note: On the 175x/1760, you need a packet voice/fax digital signal processor (DSP) module (PVDM) in order to support the VIC-2E/M. The PVDMs hold DSPs that make the card fully functional. You install these PVDMs on the motherboard within the 175x/1760. The 1750 requires a PVDM-4 for one VIC-2E/M and a PVDM-8 for two VIC-2E/Ms. On the 1751/1760 platforms, you need a second generation of PVDM:

  • PVDM-256K-4 for one VIC-2E/M or VIC2-2E/M

  • PVDM-256K-8 for two VIC-2E/Ms or VIC2-2E/Ms

The 1750 platforms do not support PVDM-256K-xx. Refer to Troubleshooting Unrecognized Voice Interface Cards on Cisco 1750, 1751, and 1760 Routers for more information about 1700 series voice gateway DSP resource requirements.

On the Cisco VG200, 2600, and 3600, the NM-1Vs and NM-2Vs come with the DSPs installed on the module.

Note: The Cisco IOS Software releases that the table provides are typically the minimum version that you need to support the platform, module, or feature in question. For a complete list of Cisco IOS Software releases that support a feature, module, interface card, or chassis, use the Software Advisor (registered customers only) tool.

VIC2-2E/M

Cisco IOS Software Support 1751, 1760 ICS 7700/7750 2600XM, 2650XM 2691 3640, 3640A, 3660 3725, 3745
Carrier Module Not Required Not Required NM-HD-1V/NM-HD-2V, NM-HD-2VE , NM-HDV2 1 NM-HD-1V/NM-HD-2V, NM-HD-2VE , NM-HDV2 1 NM-HD-1V/NM-HD-2V, NM-HD-2VE NM-HD-1V/NM-HD-2V, NM-HD-2VE , NM-HDV2 1
VIC2-2E/M Cisco IOS Software Release 12.2(15)ZL, 12.3(2)XC, 12.3(4)T, 12.3(5) Cisco IOS Software Release 12.2(15)ZL, 12.3(2)XA Cisco IOS Software Release 12.2(15)ZJ, 12.3(4)T Cisco IOS Software Release 12.2(15)ZJ, 12.3(4)T, 12.3(4)XD Cisco IOS Software Release 12.2(15)ZJ, 12.3(4)T Cisco IOS Software Release 12.2(15)ZJ, 12.3(4)T, 12.3(4)XD

1For NM-HDV2, there is support in Cisco IOS Software Release 12.3(7)T and later.

Note: These platforms do not support the new VIC2-2E/M in any special Cisco IOS Software release:

  • 1750

  • VG200

  • 2600 (non-XM)

  • 3620

  • Catalyst 4500/4000 series

  • Catalyst 6500/6000 series

Also, Cisco IOS Software Release 12.3T will not support the new VIC2-2E/M.

Known Issues

One known problem is the result of Cisco bug ID CSCdj82747 (registered customers only) . The VIC-2E/M module changes port designation on its own after the configuration of a port parameter. The resolution of this bug is in Cisco IOS Software Release 11.3(2.2)T and later releases.

Related Information

Updated: Feb 02, 2006
Document ID: 7937