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Joined: January 26 2005
Location: United States
Posts: 1666
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| Posted: November 11 2005 at 8:38am | IP Logged
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Hi Tabish,
Supported codecs are:
8k uLaw, 8k PCM, 11k PCM and 22k PCM. Development is under way to offer additional low bit rate codecs such as iLBC and G729 and will be available in the near future.
Silence suppression:
Silence suppression can be applied to all transmitted RTP streams (controlled via the API). If the energy level of the transmitted voice signal (as specified by your application via the API) is lower than the set level, then no RTP media will be transmitted. This is primarily used to minimize the transmission of network media packets when no one is speaking. The VOIP Media Engine calls this capability “noise discrimination”.
Comfort noise generation:
Because this capability is highly associated with the type of codec being used during RTP media exchange, there is no specific support for comfort noise generation. However, comfort noise can be added by your application software for all transmitted RTP media. Your application can in effect “mix” any type of signal or “pink noise” to any transmitted RTP media stream.
Jitter and packet loss:
The Voip Media Engine uses an adaptive jitter buffer and packet loss concealment scheme that is proprietary to LanScape. Normally your application does not need to be concerned with jitter or packet loss. However, if the adaptive RTP receiver capabilities of the VOIP Media Engine do not fit your requirements, adaptive RTP receiver functions can be turned off. In this case you can specify an appropriate jitter buffer tolerance in milliseconds.
To learn more about the product, we suggest you download and install the trial version. You will have access to the developer’s documentation and can experiment with the example source code. To learn more about the trial version, please see the following URL:
http://www.lanscapecorp.com/ProductPages/LanScapeVoipMediaEn gine.asp
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LanScape Support Forum -> LanScape VOIP Media Engine™ - Pre-Sales Technical Support
Topic: Codec Support And Audio Quality
