Cisco Systems 3600 manual Frame Relay for Voice over IP Configuration Example

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Frame Relay for Voice over IP Configuration Example

Note Lowering the MTU size affects data throughput speed.

CIR equal to line rate—Make sure that the data rate does not exceed the CIR. This is accomplished through generic traffic shaping.

Use IP Precedence to prioritize voice traffic.

Use compressed RTP to minimize voice packet header size.

Traffic shaping—Use adaptive traffic shaping to throttle back the output rate based on the BECN. If the feedback from the switch is ignored, packets (both data and voice) might be discarded. Because the Frame Relay switch does not distinguish between voice and data packets, voice packets could be discarded, which would result in a deterioration of voice quality.

Use compressed RTP, reduced MTU size, and adaptive traffic shaping based on BECN to hold data rate to CIR.

Use generic traffic shaping to obtain a low interpacket wait time. For example, set Bc to 4000 to obtain an inter-packet wait of 125 ms.

Note We recommend FRF.12 fragmentation setup rules for Voice over IP connections over Frame Relay. FRF.12 was implemented in the Cisco IOS Release 12.0(4)T. For more information, refer to the Cisco IOS Release 12.0(4)T “Voice over Frame Relay using FRF.11 and FRF.12” feature module.

Frame Relay for Voice over IP Configuration Example

For Frame Relay, it is customary to configure a main interface and several subinterfaces, one subinterface per PVC. The following example configures a Frame Relay main interface and a subinterface so that voice and data traffic can be successfully transported:

interface Serial0/0 ip mtu 300

no ip address encapsulation frame-relay no ip route-cache

no ip mroute-cache fair-queue 64 256 1000

frame-relay ip rtp header-compression

interface Serial0/0.1 point-to-point ip mtu 300

ip address 40.0.0.7 255.0.0.0 no ip route-cache

no ip mroute-cache bandwidth 64

traffic-shape rate 32000 4000 4000 frame-relay interface-dlci 16 frame-relay ip rtp header-compression

In this configuration example, the main interface has been configured as follows:

MTU size of IP packets is 300 bytes.

No IP address is associated with this serial interface. The IP address must be assigned for the subinterface.

Encapsulation method is Frame Relay.

Configuring Voice over IP for the Cisco 3600 Series VC-23

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Contents How Voice over IP Processes a Telephone Call Configuring Voice over IP for the Cisco 3600 SeriesList 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 Step Command Purpose Configure Multilink PPP with InterleavingMultilink PPP Configuration Example Configure RTP Header CompressionChange the Number of Header Compression Connections Enable RTP Header Compression on a Serial InterfaceRTP Header Compression Configuration Example Configure Weighted Fair Queuing Configure Frame Relay for Voice over IPConfigure Custom Queuing Frame Relay for Voice over IP Configuration Example Create a Number Expansion Table Configure Number ExpansionShows the number expansion table for this scenario Configure Number ExpansionInbound versus Outbound Dial Peers Configure Dial PeersInbound versus Outbound Dial Peers Codec Create a Peer Configuration TableDirect Inward Dial for Pots Peers Configure Pots PeersOutbound Dialing on Pots Peers Incoming and Outgoing Pots Call Legs Configure VoIP Peers Validation Tips Optimize Dial Peer and Network Interface ConfigurationsConfigure IP Precedence for Dial Peers Troubleshooting TipsConfigure Rsvp for Dial Peers Configure Codec for a VoIP Dial Peer Configure Codec and VAD for Dial PeersConfigure VAD for a VoIP Dial Peer Configure Voice over IP using a Trunk ConnectionVC-36Voice, Video, and Home Applications Configuration Guide Configure a Trunk Connection Configure Voice over IP for Microsoft NetMeetingFXS-to-FXS Connection Using Rsvp Voice over IP Configuration ExamplesFXS-to-FXS Connection Example Configuration for Router RLB-1VC-40Voice, Video, and Home Applications Configuration Guide Configuration for Router R12-e Configuration for Router RLB-wConfiguration for Router RLB-2 Linking PBX Users with E&M Trunk Lines Configuration for Router SJConfiguration for Router SLC Pstn Gateway Access Using FXO Connection Example Pstn Gateway Access Using FXO ConnectionPstn 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.