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Voice over IP
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The number of enterprises deploying IP telephony has jumped dramatically in the past year, and the reason is simple: end-to-end IP telephony solutions that deliver a full range of voice services have arrived. By combining cost savings, ease of use, and the ability to quickly develop and deploy applications and features, IP telephony is changing the way the enterprise world communicates.
Enterprises planning to migrate to IP telephony systems can save time and money by planning ahead. To this end, it's helpful to understand the underlying principles of IP telephony, as well as the infrastructure and components necessary to build a scalable, highly reliable voice-over-IP (VoIP) network.
IP Telephony Deployment, Building Blocks
Many enterprises have already implemented VoIP as a form of toll bypass, but, by deploying a complete IP telephony solution, enterprises leverage the inherent cost savings of a converged network across the organization, while adding new features and functions.
Deployment Models
There are four basic models for IP telephony deployment in the enterprise:
- Single-site deployment - IP telephony is deployed within a building or campus, but no voice traffic is carried over the IP WAN
- Independent call-processing approach - IP telephony is deployed within various remote locations, but calls are transmitted across the public switched telephone network (PSTN)
- Multisite deployment with distributed call processing - Calls are transmitted using both the IP WAN (primary path) and the PSTN (secondary path) to connect enterprise locations. Call-processing and voice-messaging equipment are present at each location, but interconnect across the WAN
- Multisite deployment with centralized call processing - Calls are transmitted using both IP WAN (primary path) and the PSTN (secondary path), but call-processing and voice-messaging equipment are centrally located. This is often the most efficient solution for multisite enterprises
Building Blocks
An IP telephony system has four distinct layers. Each of these layers fulfills a specific function in ensuring high-quality voice transmission:
- Client layer - desktop equipment such as IP phones, Cisco IP SoftPhones and videoconferencing equipment
- Infrastructure layer - Gateways, routers and switches
- Call-processing layer - Redundant call control and directories
- Application layer - Voice mail or unified messaging, personal productivity applications and business productivity applications
Datel's IP Specialty Service Team can work with you to tailor the best design and deployment process for this technology. We will insure that the necessary "building blocks" are in place and that our IP Telephone System will meet your organization's current and future voice communication requirements.
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