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Chapter 2 Getting Started
Establishing Connectivity
•Installing the SPA900 Series IP Phone, page
Bandwidth Requirements1
Depending on how you have your IP phones configured, each call requires 55 to 110 kbps in each direction. Therefore, using G.729 as the voice codec setting, and with an average
(7)simultaneous conversations can be reliably supported with adequate bandwidth available for file downloads.
Linksys recommends using the Linksys IP phone with
Table
Codec | Approximate bandwidth budget for | 2 calls | 4 calls | 6 calls | 8 calls |
each side of conversation | |||||
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G.711 | 110 kbps | 220 kbps | 440 kbps | 660 kbps | 880 kbps |
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87 kbps | 174 kbps | 348 kbps | 522 kbps | 696 kbps | |
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79 kbps | 158 kbps | 316 kbps | 474 kbps | 632 kbps | |
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71 kbps | 142 kbps | 284 kbps | 426 kbps | 568 kbps | |
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63 kbps | 126 kbps | 252 kbps | 378 kbps | 504 kbps | |
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G.729 | 55 kbps | 110 kbps | 220 kbps | 330 kbps | 440 kbps |
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This table is based on the following assumptions:
•Bandwidth Calculated with No Silence Suppression
•20 Millisecond of payload per RTP packet
Note The use of silence suppression can reduce the average bandwidth budget by 30% or more.
For more information about bandwidth calculation, refer to the following websites:
http://www.erlang.com/calculator/lipb/
http://www.packetizer.com/voip/diagnostics/bandcalc.html
Installing the SPA900 Series IP Phone
This section describes how to install and verify operation of SPA900 Series IP phones.
Check to make sure that you have the following package contents:
•Linksys 900 Series phone
•Ethernet cable
•Power adapter (must be ordered separately for PoE units: SPA922, SPA942, and SPA962)
| Linksys IP Phone Administrator Guide |
Firmware Version 5.1 |