Configuring Voice Interface Cards

The destination-patterncommand defines the telephone number associated with the VoFR dial peer. The session target command specifies a destination DLCI for the VoFR dial peer.

Use the dial-peer voice command to define dial peers and to change to dial peer configuration mode. For examples, see the “Configuring FXS Interfaces” section on page 17, the “Configuring FXO Interfaces” section on page 23, and the “Configuring E&M Interfaces” section on page 24.

Wildcards and Number Expansion

Office PBXs are configured so that a user can dial a local call (within the same PBX) by dialing the extension only—for instance, the four-digit extension 3737, or the five-digit extension 53737—rather than dialing the full telephone number, 1 408 555-3737.

You can provide the same shortcut on a VoIP network by using the number-expansion(num-exp) command.

Router(config)# num-exp 5....

1408555....

This command tells the router to expand a particular sequence of dialed numbers into a complete telephone number (destination pattern) as shown in Table 1.

Table 1	Sample Number Expansion Table

	Destination
Extension	Pattern	Num-Exp Command Entry	Description

3737	14085553737	num-exp 3737	To expand 3737 to
		14085553737	14085553737

....	1408555....	num-exp .... 1408555....	To expand any dialed sequence
			of four digits (represented by
			four periods) by prefixing
			1408555 to it

5....	1408555....	num-exp 5.... 1408555....	To expand a five-digit extension
			beginning with the numeral 5 by
			prefixing 140855 to it

You can use a period (.) as a wildcard character representing a single digit in a telephone number.

You can use the show num-expcommand to verify the number expansion information.

Router# show num-exp [dialed-number]

After you have configured dial peers and assigned destination patterns to them, you can use the show dialplan number command to see how a telephone number maps to a dial peer.

Router# show dialplan number [dialed-number]

Note You must still configure each telephone number in full on a local dial peer so that the router can find the voice port to which it belongs.

The router supports one to four Cisco VICs. Each VIC provides two ports. You need one VIC port for each voice connection.

Note To transmit voice calls over an IP WAN, you need (in addition to the VICs) at least one WIC in the router to provide the connection to the WAN.

There are five types of VIC interfaces:

•An FXS (foreign exchange station) interface connects directly to a standard telephone, a fax machine, or a similar device. The FXS VIC interface supplies ringing voltage, dial tone, and similar signals to the station. Ports on this VIC are gray.

1760 specifications

The Cisco Systems 1760 series routers are part of Cisco’s popular line of integrated services routers, designed primarily for small to medium-sized businesses and branch offices. The 1760 series was introduced to provide robust connectivity and routing solutions that facilitate secure and reliable networking. Aimed at offering flexibility, these routers integrate multiple functionalities to enhance operational performance.

One of the main features of the Cisco 1760 router is its modularity. It supports various interface and service modules that allow for customization based on specific networking needs. This modular design enables businesses to expand their networking capabilities over time without necessitating a complete hardware overhaul. The router typically comes equipped with two WAN slots and numerous interface options, including Fast Ethernet and serial interfaces.

The 1760 series routers also support advanced security features, providing businesses with a secure environment for their data transmissions. Built-in firewall capabilities, along with support for Virtual Private Network (VPN) protocols, ensure that sensitive information remains protected. Furthermore, the integration of IPsec and MPLS security features assists organizations in maintaining secure and scalable connections across diverse networks.

Another characteristic of the Cisco 1760 is its support for various technologies, including Quality of Service (QoS). QoS functionality allows network administrators to prioritize traffic, ensuring that critical applications receive the bandwidth they require while minimizing latency. This ability is particularly valuable in environments where voice, video, and essential data applications compete for resources.

The router’s ease of management is also noteworthy. With Cisco’s IOS (Internetwork Operating System), the 1760 provides a user-friendly interface allowing for straightforward configuration and monitoring. The simplicity in managing the network devices helps reduce the burden on IT personnel and enhances overall operational efficiency.

Further enhancing the router’s capabilities is its support for voice over IP (VoIP) applications, making it an ideal choice for organizations looking to implement modern telephony solutions. The ability to support multiple voice channels while maintaining adequate data throughput positions the 1760 as an attractive option for businesses transitioning to unified communications.

In summary, the Cisco Systems 1760 series routers exhibit a harmonious blend of modularity, robust security, traffic management, and VoIP support. They effectively meet the demands of modern networking environments, making them a reliable choice for organizations aiming to streamline operations while ensuring secure connectivity. With their adaptable design, these routers can serve as a powerful backbone for enterprise networking needs.