Page Four

By Cameron Sturdevant  |  Posted 2002-10-21 Print this article Print

: VOIP Requirements"> VOIP Requirements The Scenario

"Industry Inc." has the following requirements for a new business telephone system that it intends to roll out in two phases.

  • Phase 1  1,500 Ethernet-connected handsets

  • Phase 2  (one year later) 10,000 Ethernet-connected handsets

    RFP Details

    1. Are the handsets line-powered?

    2. What power standards (or developing standards) or protocols are adhered to? For example, 802.3af?

    3. Describe the call processor functionality.
  • How many systems, using which cards, are necessary to support 1,500 IP handsets?
  • Describe how the system can be scaled to 10,000 handsets.
  • Describe how phone management is distributed across servers. Specifically:
                   •Under what circumstances do you recommend concentrating all
                   voice mail at a central location?
                   •Under what circumstances do you recommend distributing voice
                   mail to branch offices/remote factories?
                   •Given that Industry wishes to consolidate as much telephone-
                   specific administration as possible to headquarters, describe
                   what services must be administered locally.
  • Do you provide automatic route selection/least-cost routing?
  • Detail the pre- and post-sales traffic analysis tools, including traffic reports and services, that assist IT staff in gauging:
                   •Failover routing plans
                   •Determining factors such as BHCA (busy hour call attempts), BHCC
                   (busy hour call completions), CPS (calls per second)
                   •Capacity planning for future growth
  • What parameters can be taken into account when sampling traffic load to determine offered and carried load?
  • How many classes of service do you provide for toll restriction?
  • Can your equipment provide classes of service based on a PIN?
  • Can you restrict individual numbers from being called?
  • If call quality on the IP network degrades, what options are available to put calls through on the traditional telephone network?

    4. Detail how the new system will access the public switched telephone network.
  • Describe the equipment necessary to provide digital access for 150 outgoing lines to the PSTN when 1,500 IP handsets are in use.
  • Describe the equipment necessary to provide digital access for 750 lines to the PSTN when 10,000 IP handsets are in use.
  • Describe the equipment necessary to provide digital access for 150 incoming lines for DID (Direct Inward Dial) service in the event that 1,500 IP handsets are in use.
  • Describe the equipment necessary to provide digital access for 750 incoming lines for DID service in the event that 10,000 IP handsets are in use.
  • Explain how the call processor is integrated with the PBX.
  • Can multiple PBX servers equally share multiple call processors?
  • Can individual trunk groups transparently span multiple call processors?

    5. Describe how your proposal addresses integrated messaging.
  • Use a diagram to demonstrate the connection of your voice mail system to an e-mail system. Explain what is necessary for the e-mail client and server software to retrieve voice mail messages. Also explain, if applicable, how your voice mail system can retrieve e-mail text.
  • List the e-mail systems that integrate with your product.
  • How does your voice mail system generate subject lines for the e-mail system?

    6. How do telecommuters fit into the VOIP system?
  • Describe features that enable employees to have an "in the office" telephone experience from home, hotel room or other remote location with Internet access.
  • How are these services secured?

    7. What are the target numbers for acceptable network bandwidth to support VOIP? What additional protocols should be implemented to support VOIP?
  • Provide the amount of peak bandwidth necessary per phone per call between the handset and call processor.
  • List and detail any networking services that must be implemented, such as Dynamic Host Configuration Protocol, Domain Name System, etc.
  • List and detail the QOS (quality-of-service) standards supported by the handsets, call processor, gateways, network switches, other network equipment and end nodes, where applicable, that ensure end-to-end voice service priority. Explain how the components implement QOS standards such as 802.1p, DiffServ, TOS (Type of Service) and RSVP (Resource Reservation Setup Protocol).

    8. Call accounting features: Describe, or show an example of, the following features:
  • SMDR (Station Message Detail Recording)
  • Busy reports on outbound trunk groups
  • Busy reports on incoming trunk groups
  • Usage reports based on PIN or account numbers
  • Other reporting capabilities

    9. List all significant standards that are currently supported by your VOIP telephone system. Describe the ability of your VOIP telephone system to support SIP (Session Initiation Protocol), MGCP (Media Gateway Control Protocol) and other significant protocols and standards.

    Cameron Sturdevant Cameron Sturdevant has been with the Labs since 1997, and before that paid his IT management dues at a software publishing firm working with several Fortune 100 companies. Cameron also spent two years with a database development firm, integrating applications with mainframe legacy programs. Cameron's areas of expertise include virtual and physical IT infrastructure, cloud computing, enterprise networking and mobility, with a focus on Android in the enterprise. In addition to reviews, Cameron has covered monolithic enterprise management systems throughout their lifecycles, providing the eWEEK reader with all-important history and context. Cameron takes special care in cultivating his IT manager contacts, to ensure that his reviews and analysis are grounded in real-world concern. Cameron is a regular speaker at Ziff-Davis Enterprise online and face-to-face events. Follow Cameron on Twitter at csturdevant, or reach him by email at

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