NEC 2000 IPS Planning and Installation, Vendor Support for Open System Standards, Voice Messaging

Chapter 13 Voice Over IP (VoIP)

Planning and Installation

Vendor Support for Open System Standards

The vendor should be committed to supporting open system industry standards, such as H.323, 802.1p and 802.1q, MGCP, TAPI, JTAPI, etc.

Voice Messaging:

A scalable and cost-effective voice messaging solution that supports industry standards such as AMIS-A, VPIM, LDAP and IMAP.

Bandwidth requirements

One of the most important factors in the success of your IP network is to determine the necessary network bandwidth needed for your application. Determining the appropriate bandwidth is truly a function of two factors:

Number of Users (Phones)

Voice Compression for each user

Number of Users: The number of users is the number of simultaneous users (digital phones) that will be required.

Voice Compression: NEC’s IP solutions deploy voice compression in order to extend multiple users across fewer data channels. The following compression algorithms are supported: G.711, G.723.1 and G.729A. Depending on the voice compression algorithm selected and the number of voice frames encapsulated in one data packet.

Select the Proper Voice Compression: The best voice quality is achieved by using the non- compression voice algorithm G.711. The maximum quality comes at the expense of the highest utilized bandwidth. The largest vice compression is achieved by using G.729A. If you are using this algorithm, you will save on bandwidth and still achieve voice quality that is regarded as near toll. If absolute conversation quality is your focus and bandwidth is no object, you probably want to select G.711. If bandwidth is a priority you will need to employ G.729A.

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