Cisco Systems 3600 manual VC-18Voice, Video, and Home Applications Configuration Guide

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Configure IP Networks for Real-Time Voice Traffic

The important thing to remember is that QoS must be configured throughout your network—not just on the Cisco 3600 series devices running VoIP—to improve voice network performance. Not all QoS techniques are appropriate for all network routers. Edge routers and backbone routers in your network do not necessarily perform the same operations; the QoS tasks they perform might differ as well. To configure your IP network for real-time voice traffic, you need to take into consideration the functions of both edge and backbone routers in your network, then select the appropriate QoS tool or tools.

In general, edge routers perform the following QoS functions:

Packet classification

Admission control

Bandwidth management

Queuing

In general, backbone routers perform the following QoS functions:

High-speed switching and transport

Congestion management

Queue management

Scalable QoS solutions require cooperative edge and backbone functions.

Note In a subsequent Cisco IOS release, we have implemented enhancements to improve QoS on low speed, wide-area links, such as ISDN, MLPPP, and Frame Relay running on edge routers. For more information about these enhancements, refer to the Cisco IOS Release 12.0(5)T “IP RTP” feature module.

Although not mandatory, some QoS tools have been identified as being valuable in fine-tuning your network to support real-time voice traffic. To configure your IP network for QoS using these tools, perform one or more of the following tasks:

Configure Multilink PPP with Interleaving

Configure RTP Header Compression

Configure Custom Queuing

Configure Weighted Fair Queuing

Each of these components is discussed in the following sections.

VC-18Voice, Video, and Home Applications Configuration Guide

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Contents Configuring Voice over IP for the Cisco 3600 Series How Voice over IP Processes a Telephone CallList of Terms Prerequisite Tasks Voice over IP Configuration Task List Configure IP Networks for Real-Time Voice Traffic VC-18Voice, Video, and Home Applications Configuration Guide Configure Multilink PPP with Interleaving Step Command PurposeConfigure RTP Header Compression Multilink PPP Configuration ExampleEnable RTP Header Compression on a Serial Interface RTP Header Compression Configuration ExampleChange the Number of Header Compression Connections Configure Frame Relay for Voice over IP Configure Custom QueuingConfigure Weighted Fair Queuing Frame Relay for Voice over IP Configuration Example Configure Number Expansion Create a Number Expansion TableConfigure Number Expansion Shows the number expansion table for this scenarioConfigure Dial Peers Inbound versus Outbound Dial PeersInbound versus Outbound Dial Peers Create a Peer Configuration Table CodecConfigure Pots Peers Outbound Dialing on Pots PeersDirect Inward Dial for Pots Peers Incoming and Outgoing Pots Call Legs Configure VoIP Peers Troubleshooting Tips Optimize Dial Peer and Network Interface ConfigurationsConfigure IP Precedence for Dial Peers Validation TipsConfigure Rsvp for Dial Peers Configure Codec and VAD for Dial Peers Configure Codec for a VoIP Dial PeerConfigure Voice over IP using a Trunk Connection Configure VAD for a VoIP Dial PeerVC-36Voice, Video, and Home Applications Configuration Guide Configure Voice over IP for Microsoft NetMeeting Configure a Trunk ConnectionVoice over IP Configuration Examples FXS-to-FXS Connection Using RsvpConfiguration for Router RLB-1 FXS-to-FXS Connection ExampleVC-40Voice, Video, and Home Applications Configuration Guide Configuration for Router RLB-w Configuration for Router R12-eConfiguration for Router RLB-2 Configuration for Router SJ Linking PBX Users with E&M Trunk LinesConfiguration for Router SLC Pstn Gateway Access Using FXO Connection Pstn Gateway Access Using FXO Connection ExamplePstn Gateway Access Using FXO Connection Plar Mode Pstn Gateway Access Using FXO Connection Plar ModeConfiguring Voice over IP for the Cisco 3600 Series VC-47 VC-48Voice, Video, and Home Applications Configuration Guide
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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.

The Cisco 3600 series routers utilize advanced routing protocols, such as RIP, OSPF, EIGRP, BGP, and IS-IS, to ensure efficient data transmission and optimal network performance. This capability allows the routers to adapt to varying traffic demands and complexities, thereby optimizing bandwidth utilization and reducing latency in communications. With extensive memory options, including Flash and DRAM, the 3600 series can handle robust data processing and support intricate routing environments.

Security is another critical feature of the Cisco 3600 series. It includes support for VPNs, firewalls, and other security protocols, providing a secure environment for data transfer. The implementation of features like Access Control Lists (ACLs) and Intrusion Detection Systems (IDS) enhances the overall security posture, making it suitable for organizations looking to protect their sensitive information.

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.

Additionally, the Cisco 3600 series is designed for ease of management. Utilizing Cisco's IOS software, network administrators can manage and configure the routers efficiently, thanks to a user-friendly interface and extensive command capabilities. This makes troubleshooting simpler and ensures network availability remains high.

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.