SIP TRUNKING CISCO PRESS PDF

ISBN The first complete guide to planning, evaluating, and implementing high-value SIP trunking solutions Most large enterprises have switched to IP telephony, and service provider backbone networks have largely converted to VoIP transport. Written for enterprise decision-makers, network architects, consultants, and service providers, this book demystifies SIP trunking technology and trends and brings unprecedented clarity to the transition from TDM to SIP interconnects. The authors separate the true benefits of SIP trunking from the myths and help you systematically evaluate and compare service provider offerings. You will find detailed cost analyses, including guidance on identifying realistic, achievable savings. SIP Trunking also introduces essential techniques for optimizing network design and security, introduces proven best practices for implementation, and shows how to apply them through a start-to-finish case study. IP communications titles from Cisco Press help networking professionals understand voice and IP telephony technologies, plan and design converged networks, and implement network solutions for increased productivity.

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The last-mile provider is the only one that can guarantee quality of service QoS. If you are considering a different provider, assess whether you can transfer your DID numbers to the new provider and how long the transfer will take.

Sample test plans. Do proof-of-concept testing for the call flows that are critical to your business operation. For all but the smallest of networks comprising no more than a single or a handful of sites, this plan is for a multi-phased deployment.

Contact center deployments are often the easiest to show a return on investment ROI , but are the most complex call flows to validate. General business call flows are easier to validate, but may have a longer ROI. Outbound calls are easiest to implement; inbound calls require DID porting to be resolved.

Your deployment plan may require geographical phases. An SBC offers security, demarcation, session management, and interworking features that protect your network from denial-of-service DoS and other SIP-based attacks, allow you to resolve troubleshooting problems, provide SIP trunk status monitoring tools, and aid in SIP manipulation to overcome myriad interoperability problems present in the industry.

Centralized designs almost always look more attractive because of their cost savings. However, this choice has network design implications that may increase the overall cost, as well as make redundancy designs a much more serious consideration because the aggregated session counts are much higher than with a TDM gateway.

A distributed design may be viable, especially if you already have a distributed Multiprotocol Label Switching MPLS network for your data network. For medium and larger networks, these points should be geographically separated. If you have to load balance your calls over more than two devices for either scalability or redundancy reasons, you may have to insert a SIP proxy or load-balancer device in between to distribute the traffic.

This situation may influence your redundancy and load-balancing considerations. Discuss with your provider how such problems will be investigated and resolved. Deploy CAC features to monitor both simultaneously active calls and call arrival rates. If not possible, make sure you understand where in your network translations occur between out-of-band signaling methods such as the traditional H. The device such as a call agent or SBC that does this conversion must have access to both the signaling and the media streams to do the conversion.

Conversion or interworking among these values may be needed on your SBC to ensure proper interoperation of calls. But it is not available on all networks and to all endpoints, so fax passthrough or fax through G. If your provider offers T. Consider keeping fax on TDM trunks for a while longer if faxing is a critical part of your business.

SIP trunk technology is not ready to carry these traffic types reliably and predictably. Although it uses more bandwidth than G. It also eases fax concerns, obviates the need for transcoding at your SBC, and better positions you for new SIP trunk services that will almost certainly include increasingly bandwidth-intensive applications such as high-fidelity wideband codecs and video. Dimensioning your network for G. SIP interoperability is not mature enough that all applications predictably interwork with other SIP applications, even though they all may be standards-compliant.

Investigate these tools generally available on call agents, SIP proxies, and SBCs to see which will meet your needs and where in the network is the best place to do these manipulations to ensure transparent interoperability with all your applications. Newer releases may support codec preference ordering configuration options. SBC calls have two IP call legs as opposed to a TDM gateway that has only one , so it is often necessary to have both dial peers to control the characteristics of each individual call leg—the default settings may not be what you need in your network.

This practice also gives you additional control points to combat toll-fraud attacks. In all other networks, use a Layer 7 SBC device with additional protection, configuration, and traffic control. Toll fraud is the single most-often reported security attack on SIP trunks today. Both your border element and the service provider SBC must make this change to be able to interoperate successfully. An advantage of distributed trunking is inherent redundancy and geographic distribution of risk similar to TDM PSTN gateway architectures.

If the SIP trunk is down at one site, you can temporarily route calls from that site through the SIP trunk of a different nearby site until service recovers. For SIP trunks with fewer sessions redundancy is generally a good design, but may not always be required. Make an assessment of the business impact of a SIP trunk failure before you decide not to implement redundancy.

Consider multiple entry points for sessions or more. Consider hardware redundancy for sessions or more. Either one can handle the full load of the SIP trunk if necessary. The service provider can load balance over these two destinations. If you want to load balance across more than two destinations for either scalability or redundancy or both reasons, you may have to put in a SIP proxy such as Cisco Unified SIP Proxy Cisco USP or another load balancer in between to help distribute the load.

Discuss inbound traffic alternate routing possibilities with your SIP trunk service provider.

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SIP Trunking

ISBN The first complete guide to planning, evaluating, and implementing high-value SIP trunking solutions Most large enterprises have switched to IP telephony, and service provider backbone networks have largely converted to VoIP transport. Written for enterprise decision-makers, network architects, consultants, and service providers, this book demystifies SIP trunking technology and trends and brings unprecedented clarity to the transition from TDM to SIP interconnects. The authors separate the true benefits of SIP trunking from the myths and help you systematically evaluate and compare service provider offerings. You will find detailed cost analyses, including guidance on identifying realistic, achievable savings. SIP Trunking also introduces essential techniques for optimizing network design and security, introduces proven best practices for implementation, and shows how to apply them through a start-to-finish case study.

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Elastic SIP Trunking

The last-mile provider is the only one that can guarantee quality of service QoS. If you are considering a different provider, assess whether you can transfer your DID numbers to the new provider and how long the transfer will take. Sample test plans. Do proof-of-concept testing for the call flows that are critical to your business operation. For all but the smallest of networks comprising no more than a single or a handful of sites, this plan is for a multi-phased deployment.

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