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Chapter 1 Introducing Linksys IP Phones
Technology Background
Table
Feature | Description |
|
|
Voice Activity | Voice Activity Detection (VAD) with Silence Suppression is a means of |
Detection with Silence | increasing the number of calls supported by the network by reducing the |
Suppression and | required bidirectional bandwidth for a single call. VAD uses a very |
Comfort Noise | sophisticated algorithm to distinguish between speech and |
Generation | signals. Based on the current and past statistics, the VAD algorithm decides |
| whether or not speech is present. If the VAD algorithm decides speech is not |
| present, the silence suppression and comfort noise generation is activated. |
| This is accomplished by removing and not transmitting the natural silence |
| that occurs in normal |
| when someone is speaking. During the silent periods of a telephone call, |
| additional bandwidth is available for other voice calls or data traffic because |
| the silence packets are not being transmitted across the network. Comfort |
| Noise Generation provides |
| (sounds), designed to reassure callers that their calls are still connected |
| during silent periods. If Comfort Noise Generation is not used, the caller |
| may think the call has been disconnected because of the “dead silence” |
| periods created by the VAD and Silence Suppression feature. |
|
|
Configurable Dial Plan | Linksys IP phones have three configurable interdigit timers: |
with Interdigit Timers | • Initial timeout |
| |
| • Long timeout |
| reach a valid number (as per the dial plan). |
| • Short timeout |
| would also lead to a valid number. |
|
|
Report Generation and | Linksys IP phones report a variety of status and error reports to assist service |
Event Logging | providers in diagnosing problems and evaluating the performance of their |
| services. The information can be queried by an authorized agent, using |
| HTTP with |
| may be organized as an XML page or HTML page. |
|
|
Syslog and Debug | Linksys IP phones support detailed logging of all activities for further |
Server Records | debugging. The debug information may be sent to a configured Syslog |
| server. Linksys IP phones provide configuration settings that determine the |
| type of activity/events that should be logged as, for example, a debug level |
| setting. |
|
|
Dynamic Payload | When no static payload value is assigned per RFC 1890, Linksys IP phones |
| can support dynamic payloads for G.726. |
|
|
Call Statistics and | The statistics collected by Linksys IP phones during normal operation |
Reporting | statistics are available in the Info tab. Line status is reported for each line (1 |
| and 2). Each line maintains up to 2 calls: Call 1 and 2. |
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|
Technology Background
This section provides background information about the technology and protocols used by the phone:
•Session Initiation Protocol, page 1-9
| Linksys IP Phone Administrator Guide |
Firmware Version 5.1 |