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Sizing the Unity Server
The Unity server has many features that are licensed. Hence, sizing the Unity server is required so that you can buy the right number of licenses and decide on the right server platform to support the number of users required and the storage requirements. Table G-4 includes the questions to ask the customer to help you size the Unity server.
| No. | Question | Answer |
|---|---|---|
| 1 | Has a study been done on traffic patterns for accessing voice mail within the existing system?If not, you should perform the study because this information is helpful in determining the number of ports/sessions required on the Unity system. You need the following information: |  Yes No |
| Average calls per hour to the voice-mail systemThe duration of the call | __________ calls__________ seconds | |
| 2 | What is the existing policy or the policy to be enforced on the voice-mail system? | Archive voice mail: (days) |
| This information, along with the codec selection, is required to size the hard disk space required for Unity. | Record opening greeting: (seconds) | |
| Record the message: (seconds) | ||
| Keep deleted voice mail? Yes No | ||
| How long do you want to keep the deleted mail? (days) | ||
| 3 | Do you currently have Outcall notification configured on the voice-mail system?Outcall Notification notifies the user at their cell and home phone numbers about new voice-mail messages they have received. | Yes No |
| 4 | What is your choice of codec?To get more information on codecs and the bandwidth used per codec, refer to the following URL:http://www.cisco.com/en/US/partner/products/sw/voicesw/ps2237/products_white_paper09186a00800875b7.shtml | G.711 G.729a ADPCM 8kbps ADPCM 6kbps GSM 6.0 G.726 |
| 5 | Do you want redundancy (failover) for Unity servers? | Yes No |
Comments/Notes
The user might be notified about new voice-mail messages by receiving a pager message or a call on a configured external phone number. Enabling these features on the Unity system not only uses the Unity ports but also requires you to provide additional infrastructure, such as telephone lines. The requirement for the number of Unity port licenses increases depending on the number of users who need these features.The selection of codec has a direct impact on the hard disk size and network bandwidth requirements. The information collected in Chapter 7 covers the sizing of hard disks based on the codec selection.
