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Checking FXO Configuration

If you configured your FXO interface according to this example, you can place outgoing calls over the

PSTN. If you have trouble placing calls, use the show voice port command to make sure that the VIC is

installed correctly. Use the show dial-peer voice command to make sure that the data you configured is

correct, and test the PSTN by connecting a handset directly to the PSTN outlet and placing a call.

Refer to the section

Note

of voice connections.

Configuring E&M Interfaces

If you have more than a few voice users at each location, the cost of voice ports and routers and the effort

needed to configure dial peers for all the combinations of origins and destinations increases rapidly. In

this situation, it might be more efficient to use a PBX at each location to switch local traffic and direct

incoming calls and then use E&M VICs to connect the PBXs over an IP network.

Figure 19

telephone network, and the IP network carries voice traffic between the offices. Each PBX connects to

an E&M VIC port in the router.

Figure 19

408 555-xxxx

Destination

To configure E&M voice ports, you need to use the following commands beginning in privileged EXEC

mode:

Command

dial-type {dtmf | pulse}

signal {wink-start | immediate | delay-dial}

cptone {australia | brazil | china | finland |

france | germany | japan | northamerica |

unitedkingdom}

operation {2-wire | 4-wire}

type {1 | 2 | 3 | 5}

78-11259-05

"Tuning Parameters for Real-Time Voice Traffic"

shows a company with two offices, West and East. Each office has a PBX to operate its internal

Linking PBXs over the IP Network (Local Dial Peers)

E&M VIC

0/0

PBX

West

dial-peer voice 111 pots

destination-pattern 1408555....

port 0/0

192.168.11.3

IP cloud

East

Task

Select the appropriate dial type for out-dialing.

Select the appropriate signal type for this

interface.

Select the appropriate voice call progress tone for

this interface.

Select the appropriate cabling scheme for this

voice port.

Select the appropriate E&M interface type.

Cisco 1751 Voice-over-IP Quick Start Guide

Configuring Voice-over-IP

if you need to improve the quality

919 555-xxxx

PBX

Source