Understanding Foreign Exchange Office (FXO) Voice Interface Cards

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Updated:August 15, 2006
Document ID:12444

Bias-Free Language

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    Introduction

    The Cisco Foreign Exchange Office (FXO) interface is an RJ-11 connector that allows an analog connection to be directed at the public switched telephone network's (PSTN's) central office or to a station interface on a private branch exchange (PBX). The FXO sits on the switch end of the connection. It plugs directly into the line side of the switch so the switch thinks the FXO interface is a telephone.

    Note: The FXO Voice Interface Card (VIC) is not the same as a Foreign Exchange Station (FXS) card and therefore does not provide dial tone. Do not plug a telephone set to the FXO VIC.

    vic-2fxo.gif

    Prerequisites

    Requirements

    There are no specific requirements for this document.

    Components Used

    This document is not restricted to specific software and hardware versions.

    Conventions

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

    Product Numbers

    Product Number Description
    VIC-2FXO Two-port FXO VIC
    VIC-2FXO-EU Two-port FXO for Europe
    VIC-2FXO-M1 Two-port FXO for U.S. with battery reversal
    VIC-2FXO-M2 Two-port FXO for Europe with battery reversal
    VIC-2FXO-M3 Two-port FXO for Australia
    VIC-4FXO-M1 Four-port FXO for U.S. with battery reversal only for the MRP
    VIC2-2FXO Two-port VIC – FXO (Universal). Also supports Centralized Automatic Message Accounting (CAMA) with software configuration
    VIC2-4FXO Four-port VIC – FXO (Universal). Also supports CAMA with software configuration
    MRP3-8FXOM1 Eight-port FXO M1 card for the MRP

    Features

    Product Number Description
    Voice Ports Two, four, or eight FXO ports
    Connections Connects to a telco line or to a PBX or key set that emulates a telco line. Uses RJ-11 connectors.

    Note: The end to end connection between the CO RJ11 jack and the router voice-port must be a straight-through connection. This means that TIP goes to TIP and RING to RING. Normally the CO provides an interface for which a standard rolled RJ11 cable may be used since the resulting connection is straight. However, sometimes the CO may not reverse the pinouts and therefore a straight RJ11 cable is needed.

    Defintions:
    • Pinouts for Rolled RJ11 Cable => TIP to RING, RING to TIP
    • Pinouts for Straight RJ11 Cable=> TIp to TIP, RING to RING
    Also note FXO ground-start services are polarity-sensitive and undesirable behavior, such as failed calls, will occur if proper polarity conventions are not observed.
    Cisco IOS® Software Feature Set Requires a Plus feature set.
    Caller ID Requires VIC-2FXO-M1, VIC-2FXO-M2, VIC-4FXO-M1, VIC2-2FXO, VIC2-4FXO, or MRP3-8FXOM1
    Battery Reversal Requires VIC-2FXO-M1, VIC-2FXO-M2, VIC-4FXO-M1, VIC2-2FXO, VIC2-4FXO, or MRP3-8FXOM1
    Ground Start Requires VIC-2FXO, VIC-2FXO-M1, VIC-2FXO-M3, VIC-4FXO-M1, VIC2- 2FXO, VIC2-4FXO, or MRP3-8FXOM1
    Loop Start Supported on all cards.

    Configuration

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

    Note: In Cisco IOS Software, issue the voice-port <slot>/<VIC slot>/<unit> global configuration command to configure the voice port parameters.

    The commands to configure VoIP on Cisco routers are very similar on all of the router platforms shown below.

    For configuration of voice features in Catalyst OS (CatOS) on a Catalyst 4000, see Configuring Voice Interfaces.

    Platform Support

    The following table shows which platforms support the various FXO VICs including Cisco IOS Software release support selection.

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

    Cisco IOS Software Support 1 1750 2 1751 2 1760 2 VG200 2600, 3620 2600XM, 2691, 3725, 3745 3640 3, 3660 3 2811 4, 2821 4, 2851 4 3825 4, 3845 4 MRP ICS7750 IAD2431, IAD2432 Catalyst 4000
    Carrier Module Not Required Not Required Not Required NM-1V, NM-2V NM-1V, NM-2V NM-1V, NM-2V NM-HD-1V, NM-HD-2V, NM-HD-2VE NM-HDV2 NM-1V, NM-2V NM-HD-1V, NM-HD-2V, NM-HD-2VE NM-HDV2 NM-HD-1V, NM-HD-2V, NM-HD-2VE, NM-HDV2 NM-HD-1V, NM-HD-2V, NM-HD-2VE, NM-HDV2 Not Required Not Required WS-X4604 AGM
    VIC-2FXO All Versions All Versions All Versions 12.1(3)T All Versions All Versions Not Supported Not Supported All Versions Not Supported Not Supported Not Supported Not Supported 12.2(1)XD 12.2(1)XD 12.1(3a)XI
    VIC-2FXO-EU All Versions All Versions All Versions 12.1(3)T 11.3(6)T, 12.0(2), 12.0(2)T, 12.0XK, 12.1, 12.1T, 12.2, 12.2T, All Versions Not Supported Not Supported 11.3(6)T, 12.0(2), 12.0(2)T, 12.0XK, 12.1, 12.1T, 12.2, 12.2T, Not Supported Not Supported Not Supported Not Supported 12.2(1)XD 12.2(1)XD 12.1(3a)XI
    VIC-2FXO-M1 12.2(2)XJ 12.2(2)XJ All Versions 12.1(3)T 12.0(7)XK, 12.1(2)T, 12.2, 12.2T All Versions Not Supported Not Supported 12.0(7)XK, 12.1(2)T, 12.2, 12.2T Not Supported Not Supported Not Supported Not Supported 12.2(1)XD 12.2(1)XD Not Supported
    VIC-2FXO-M2 12.2(2)XJ 12.2(2)XJ All Versions 12.1(3)T 12.0(7)XK, 12.1(2)T, 12.2, 12.2T All Versions Not Supported Not Supported 12.0(7)XK, 12.1(2)T, 12.2, 12.2T Not Supported Not Supported Not Supported Not Supported 12.2(1)XD 12.2(1)XD Not Supported
    VIC-4FXO-M1 Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported 12.2(8)YN, 12.2(15)ZL 12.2(8)YN, 12.2(15)ZL Not Supported
    VIC-2FXO-M3 12.1(5)T, 12.2, 12.2T 12.1(5)T, 12.2, 12.2T All Versions 12.1(3)T 11.3(6)T, 12.0(2), 12.0(2)T, 12.0XK, 12.1, 12.1T, 12.2, 12.2T, All Versions Not Supported Not Supported 11.3(6)T, 12.0(2), 12.0(2)T, 12.0XK, 12.1, 12.1T, 12.2, 12.2T, Not Supported Not Supported Not Supported Not Supported 12.2(1)XD 12.2(1)XD Not Supported
    VIC2- 2FXO Not Supported 12.2(15)ZL, 12.3(4)T, 12.3(4)XG, 12.3(5) 12.2(15)ZL, 12.3(4)T, 12.3(4)XG, 12.3(5) Not Supported Not Supported Not Supported 12.2(15)ZJ, 12.3(4)T 12.3(7)T Not Supported 12.2(15)ZJ, 12.3(4)T 12.3(7)T 12.3(8)T4 12.3(11)T Not Supported Not Supported Not Supported
    VIC2- 4FXO Not Supported 12.2(15)ZL, 12.3(4)T, 12.3(4)XG, 12.3(5) 12.2(15)ZL, 12.3(4)T, 12.3(4)XG,12.3(5 Not Supported Not Supported Not Supported 12.2(15)ZJ, 12.3(4)T 12.3(7)T 12.3(7)T Not Supported 12.3(7)T 12.3(8)T4 12.3(11)T 12.2(15)ZL 12.2(15)ZL Not Supported
    MRP3- 8FXOM1 Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Supported Not Not Supported Not Not Supported Not Not Supported Not Supported 12.2(8)YN and 12.2(15)ZL 12.2(8)YN and 12.2(15)ZL Not Supported

    1 Voice features require a PLUS image in the Cisco IOS Software classic feature-sets, or an appropriate selection from the list of the Cisco IOS Software cross-platform feature-sets. For more information, refer to Product Bulletin No. 2089: Cisco IOS 12.3 Mainline and 12.3T Feature Sets for Cisco 2691 for additional information.

    2 On the 1700 voice platforms, one or more PVDMs are needed to support VICs, or voice ports are missed in the active configuration. The PVDMs hold DSPs that make the VICs fully functional, and are installed on the motherboard of the 1700 series. For more information, refer to Troubleshooting Unrecognized Voice Interface Cards on Cisco 1750, 1751, and 1760 Routers. On the Cisco VG200, 2600, 2600XM, 2691, 3600, and 3700 series routers, the carrier network modules (NM-1V, NM-2V, NM-HD-1V, NM-HD-2V, NM-HD-2VE, NM-HDV2) come with the DSPs installed on the module.

    3 Voice is not supported on the Cisco 3631 series router.

    4 The Cisco 2811, 2821, 2851, 3825, and 3845 voice routers do not support the NM-1V and NM-2V voice/fax network modules.

    Certain FXO VICs include two jumper headers, W3 and W4, to set loop-start or ground-start mode (see the Features table). One jumper configures each FXO port. The default setting, which should be satisfactory in most installations, is loop start. In this setting, jumpers are placed over positions 2 and 3 of headers W3 and W4. Most modern central office equipment, such as DMS-100 and 5ESS switches, provides calling party control (CPC) and Ring on Seize on loop-start lines. CPC allows quicker disconnection, and Ring on Seize minimizes glare (collision of inbound and outbound calls on the same interface). If your central office does not provide these features on loop start, you may want to configure the FXO card for ground-start operation instead by moving the jumpers to positions 1 and 2. For proper operation, both jumpers must be configured identically. In most cases, jumper setting should have little or no effect on operation.

    The FXO interface configured for GroundStart is polarity sensitive. If you see a 0x22 disconnect cause code from the output of the debug debug voip ccapi inout command, you may have the telco ground connected to the FXO ground on the router. This can be caused by an incorrect RJ-11 cable between the FXO port and the telco jack. If you are using a straight through cable try using a crossover, or if you are using a crossover try using a straight through.

    The Cisco IOS Software versions provided are typically the minimum version required to support the platform, module or feature in question. To find out a complete list of Cisco IOS Software versions a feature, module, interface card, or chassis is supported in, use the Software Advisor (registered customers only) only tool.

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