Configure Voice over IP using a Trunk Connection

Configure VAD for a VoIP Dial Peer

To disable the transmission of silence packets for a selected VoIP peer, use the following commands beginning in global configuration mode:

Step

Command

Purpose

1

dial-peer voice number voip

Enter the dial-peer configuration mode to configure

 

 

a VoIP peer.

 

 

 

2

vad

Disable the transmission of silence packets

 

 

(enabling VAD).

 

 

 

The default for the vad command is enabled; normally the default configuration for this command is the most desirable. If you are operating on a high bandwidth network and voice quality is of the highest importance, you should disable vad. Using this value will result in better voice quality, but it will also require higher bandwidth requirements for voice.

For example, to enable VAD for VoIP dial peer 108, enter the following:

dial-peer voice 108 voip destination-pattern +14085551234 vad

session target ipv4:10.0.0.8

Configure Voice over IP using a Trunk Connection

A trunk is a communication line between two switching systems; typically, the switching equipment in a central office and a PBX. A trunk connection is a permanent physical layer (wire), point-to-point connection.

Voice over IP simulates a trunk connection by creating virtual trunk tie lines between PBXs connected to Cisco 2600 and 3600 series routers on each side of a VoIP connection. (See Figure 11.) In this example, two PBXs are connected using a virtual trunk. PBX-A is connected to Router A via an E&M voice port; PBX-B is connected to Router B via an E&M voice port. The Cisco routers spoof the connected PBXs into believing that a permanent trunk tie line exists between them.

Figure 11 Virtual Trunk Connection

1(308)555-0180

172.19.10.10

172.20.10.10

1(510)555-0190

 

PBX-A

Router A

 

 

Router B

PBX-B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IP cloud

 

 

 

 

E&M

 

E&M

 

 

 

 

 

 

 

 

Virtual trunk connection

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Configuring Voice over IP for the Cisco 3600 Series VC-35

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Cisco Systems 3600 manual Configure Voice over IP using a Trunk Connection, Configure VAD for a VoIP Dial Peer

3600 specifications

Cisco Systems 3600 is a high-performance modular router series designed for small to medium-sized enterprises and branch offices. Launched in the late 1990s, it has been widely recognized for its flexibility, scalability, and reliability. The series is part of Cisco's extensive networking portfolio and has played a vital role in delivering various services and applications while enhancing operational efficiency.

One of the main features of the Cisco 3600 series is its modular architecture, allowing organizations to customize the router according to their specific needs. The system supports various interface modules that can accommodate different types of connections, including serial, Ethernet, and DSL, which helps in building versatile network solutions. The modularity not only increases the router’s lifespan by enabling upgrades as technology changes but also supports future expansion as the organization grows.

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In terms of scalability, Cisco 3600 routers can easily accommodate increased workloads and network growth. This is done through the provision of additional modules and cards to increase capacity and performance. The series can also support multiple WAN connections, enabling seamless integration with various telecommunication services.

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In conclusion, Cisco Systems 3600 series routers combine robust performance, security features, and scalability, making them an invaluable asset for businesses looking to maintain a reliable and efficient networking solution.