Chapter 4 Configuring Voice

Configuring the MAC Address Convention

 

Command or Action

Purpose

Step 20

 

 

dial-peer voice tag pots

Defines a particular dial peer, to specify the method of

 

 

voice encapsulation, and to enter dial-peer configuration

 

Example:

mode. Tag defines a particular dial peer. The tag range is

 

from 1 to 2147483647. The POTS peer uses VoIP

 

VG(config)# dial-peer voice 999000 pots

 

encapsulation on the IP backbone.

 

 

Step 21

 

 

service stcapp

Enables STC application feature service.

 

Example:

 

 

VG(config)# service stcapp

 

Step 22

 

 

port port-number

Configures the port number.

 

Example:

 

 

VG(config)# port 0/0

 

 

VG(config)# port 0/1

 

 

VG(config)# port 0/2

 

Step 23

 

 

exit

Exits to global configuration mode.

 

Example:

 

 

VG(config)# exit

 

 

 

 

Configuring the MAC Address Convention

The voice gateways use the MAC address of the SCC local interface to define unique MAC addresses for each voice port by using the last 9 digits of the SCCP local interface of the voice gateway.

For example, if the source interface MAC address is 000C.8639.5833, the MAC address of the voice port MAC address will be C863.9583.3XXX. In the preceding example, the last 9 digits of the SCCP of the local voice gateway become the first 9 digits of the voice port MAC address after dropping the leading 000.

The last 3 digits of the voice port MAC address is the slot number (3-bit) + subunit number (2-bit) + port number (7-bit) in hexadecimal format. You combine the digits to get the last three MAC address digits.

For example, the voice-port 0/0 is slot number 0 (000): subunit 0 (00) and port number 0 (0000000). By

stringing the digits together, you get the following: 0000 0000 0000 = 0 0 0. This means that if the source interface MAC address is 001f.cac3.b3f8, the MAC address of voice port 0/0 will be 1FCAC3b3f8000.

Table 4-1shows the voice port to MAC address conversion table.

Table 4-1

Voice Port to MAC Address Conversion Chart

 

 

 

 

 

 

Last Three Digits of the MAC

Port Number

 

Address

 

 

 

 

0/0

 

000

 

 

 

 

 

0/1

 

001

 

 

 

 

 

0/2

 

002

 

 

 

 

 

0/3

 

003

 

 

 

 

 

 

Cisco VG202, Cisco VG202XM, Cisco VG204, and Cisco VG204XM Voice Gateways Software Configuration Guide

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Cisco Systems VG202XM, VG204 Configuring the MAC Address Convention, Last Three Digits of the MAC, Port Number Address
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VG202, VG204XM, VG204, VG202XM specifications

Cisco Systems has long been a leader in the realm of networking technology, providing innovative solutions for businesses of all sizes. Among its products, the Cisco VG202XM, VG204, VG204XM, and VG202 series stand out as vital components in voice gateway solutions for IP telephony applications.

The Cisco VG202XM and VG204 series are designed to facilitate the convergence of voice and data as businesses transition to VoIP (Voice over Internet Protocol). These voice gateways offer seamless integration with legacy telephony systems while enabling the deployment of advanced IP-based telephony features. They are particularly useful for organizations looking to preserve their existing investments in traditional telephony infrastructure while embracing modern communication technologies.

One of the main features of the VG202XM and VG204 series is their support for two-line interfaces, catering to varying deployment needs. The VG202 provides two FXS (Foreign Exchange Station) ports, which allow businesses to connect analog phones and fax machines directly. The VG204 enhances this capability by offering four FXS ports, accommodating larger user bases and providing more connections for local telephony equipment.

These gateways support an array of voice codecs and can handle up to 16 concurrent calls, ensuring high-quality voice communication in busy environments. Their integration with Cisco's Unified Communications Manager allows users to access a host of advanced telephony features such as call forwarding, voicemail, and conferencing.

On the technology front, the VG202XM and VG204 series support both SIP (Session Initiation Protocol) and H.323 protocols, making them versatile for varied network environments. They also offer advanced QoS (Quality of Service) capabilities, ensuring that voice traffic is prioritized over other types of data, which is essential in maintaining call clarity and reliability.

Additionally, the VG204XM variant adds built-in safety features, such as power over Ethernet (PoE), which eliminates the need for separate power supplies for connected devices. This not only streamlines deployment but also enhances the reliability of the voice system.

In terms of management, these devices are equipped with Cisco's user-friendly interface, which simplifies configuration and monitoring. They can be managed through various tools offered by Cisco, making it easier for IT departments to maintain and optimize their voice services.

Overall, the Cisco VG202XM, VG204, VG204XM, and VG202 series deliver robust, scalable, and reliable solutions for businesses aiming to leverage the benefits of voice gateways in their enterprise networks. These devices not only provide essential voice capabilities but also pave the way for future growth and integration in an increasingly digital world.
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