Cisco IOS Voice Troubleshooting and Monitoring Guide, Release 1. Troubleshooting Analog Voice Interfaces to the IP Network . Analog voice port interfaces connect routers in packet- based networks to analog two- wire or four- wire analog circuits in telephony networks. Two- wire circuits connect to analog telephone or fax devices, and four- wire circuits connect to PBXs. Analog voice telephony interfaces include foreign exchange office (FXO), foreign exchange station (FXS), and receive and transmit (E& M). Direct Inward Dialing (DID) is a service offered by telephone companies that enables callers to dial directly to an extension on a PBX without the assistance of an operator or automated call attendant.

Cisco IOS Voice Troubleshooting and Monitoring Guide, Release 12.4. Chapter Title. Troubleshooting Analog Voice Interfaces to the IP Network. We offer you challenging and rewarding work, generous benefits, and a commitment to help you grow professionally. If you are dedicated to your work, committed to. Software testing is an investigation conducted to provide stakeholders with information about the quality of the software product or service under test.

These notes contain configuration information for Cisco gateways and several types of PBXs. To access these notes, use the following website: http: //www. The FXS interface supplies ring, voltage, and dial tone to the station and includes an RJ- 1. PBXs. In Figure 1. Dj Roc The Crack Capone 3200 here.

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FXS signaling is used for end- user telephony equipment, such as a telephone or fax machine. Cabling Two types of cabling are supported for Cisco FXS interfaces. They are described in the following sections: . A 4- wire cable can cause the second port to busy out. Illustrations of the connector ports are shown in Figure 1.

Figure 1. 2. Information about LEDs can be found in the . This network module supports both FXS and FXO traffic. An illustration of the connector port is shown in Figure 1. Information about LEDs and pinouts can be found in the . Enter the show voice port command with the voice port number that you are troubleshooting. The output will tell you: .

If it is not, use the no shutdown command to make it active. If these values do not match those of the telephony connection you are making, reconfigure the voice port. If only one port is bad and the others are working, in many cases you can disable the bad port and then use the working ports until a replacement arrives. To disable a bad port, use one of the following methods: . This setting allows the port to be taken out of service without disrupting the Cisco IOS configuration. See the product documentation for details: –Cisco AS5. Cisco AS5. 40. 0 product documentation –Cisco AS5.

Cisco AS5. 85. 0 product documentation . This section discusses what voltages are supplied by various Cisco FXS interfaces and how to overcome some known issues regarding voltage levels.

This voltage takes into account the effects of load and cabling voltage drop on a ringing signal generated from a central office (CO). Conversely, the CO (exchange) must supply ringing with enough power to drive the maximum load over the maximum cable length.

In order to meet this requirement, a CO- based unit must present a ringing signal with an amplitude of approximately 8. Vrms. Cisco voice gateways are intended for use as on premise services (ONS) equipment that is colocated or fairly close to equipment that detects ringing, so it can therefore use a lower ringing voltage and still meet the 4.

Vrms 5 Ringer Equivalence Number (REN) requirement. Certain Cisco FXS interfaces can be configured to supply higher voltages. If another device is off hook, then the line voltage drops, and the automated system does not answer or initiate a call. If the threshold being used is close to - 2. V or higher, this can cause the device not to work as expected. The idle- voltage low setting designates - 2.

V and the idle- voltage high setting designates - 4. V. Note This option is not available on VG2. VIC- 2. FXS, and WS- x. FXS interfaces. Sometimes it is necessary to adjust the frequency of the ring to suit the connected device. Increasing the voltage can overcome this.

The 2. 4- V ring DC offset setting is available for Cisco IOS 1. T and later releases. The failure results from a physical interoperability issue and is independent of Cisco hardware or software. British Telecom did not implement RJ- 1. RJ- 1. 1 connectors allow parallel connectivity for the transmission path and the ringer circuit. They were not used because older telephones needed to have their ringer circuits connected in series due to a requirement for high current.

In the United Kingdom, certain British Approval Board for Telecommunications (BABT) telephones fail to ring when they are connected to FXS ports on Cisco voice- enabled routers and switches. Outgoing calls can be made and voice communication in both directions can be established. However, incoming calls do not ring the telephone. These telephones functioned correctly before they were connected to the FXS ports.

Because a proprietary connection system is implemented, you must use an adapter to connect the telephone to an FXS port. The adapter must be a master that contains the capacitor, or the telephone fails to ring. The router seizes a line on the local PBX but when digits are dialed, the dial tone stays. The calling party is unable to pass the dual- tone multifrequency (DTMF) tones or digits to the terminating device, resulting in callers being unable to dial the desired extension or interact with a device that needs DTMF tones such as a voice mail or an interactive voice response (IVR) application. This problem can result from a number of sources, for example: . The FXS port does not pass on the digits; therefore, this setting is not available on an FXS port. However, this setting can be changed on FXO and E& M ports: Router(config- voiceport)# dial- type ?

If you have an analog card like the VIC- 2. FXS or the VIC2- 4. FXS, you might have one of the following problems: .

Step 2 Test the LED using a different phone. Step 3 Check your Cisco IOS version to make sure that the feature set is either IP Plus or Enterprise Plus. Step 4 If Steps 1 to 3 do not work, replace the voice interface card (VIC). This interface is of value for off- premises station applications. Figure 1. 4 shows an FXS connection to a telephone and an FXO connection to the PSTN at the far side of a WAN. Troubleshoot FXO hardware by checking the following sections: .

Cabling Two types of cabling are supported for Cisco FXO interfaces. They are described in the following sections: . A 4- wire cable can cause the second port to busy out. Chung Ta Noi Workbook Manual Meat. Illustrations of the connector ports are shown in Figure 1. Figure 1. 6. Information about LEDs can be found in the .

This network module supports both FXS and FXO traffic. An illustration of the connector port is shown in Figure 1.

Information about LEDs and pinouts can be found in the . Enter the show voice port command with the voice port number that you are troubleshooting. The output will tell you: . If it is not, use the no shutdown command to make it active. If these values do not match those of the telephony connection you are making, reconfigure the voice port. If only one port is bad and the others are working, in many cases you can disable the bad port and use the working ports until a replacement arrives.

To disable a bad port, use one of the following methods: . This allows the port to be taken out of service without disrupting the Cisco IOS configuration.

Refer to the product documentation for details: –For Cisco AS5. Cisco AS5. 40. 0 universal gateways, refer to the . The FXO interface closes the loop to indicate off hook. The switch always provides a battery so there is no disconnect supervision from the switch side. Because a switch expects a phone user or modem to hang up the phone when the call is terminated on either side, it also expects the FXO port on the router to hang up.

However, the FXO port expects the switch to tell it when to hang up. Because the port relies on the switch, there is no guarantee that a near- or far- end FXO port will disconnect the call once either end of the call has hung up. This feature applies to analog FXO voice ports with loop- start signaling connected to PSTNs, PBXs, or key systems. If an FXO voice port is connected to the PSTN and battery reversal is supported, use the battery reversal method.