Matrix PRASAR UCS - Page 356

Matrix PRASAR UCS System Manual 347
Jitter Buffer
The speed at which voice packets travel through a network depends on the condition of the network. All voice
packets may not come at the same speed. This variation in the delay in receiving packets, known as Jitter, affects
voice quality. Jitter Buffer helps overcome the delay in receiving voice packets and improves voice quality. Jitter
Buffer receives voice packets, stores them and sends it to the DSP to process it at evenly spaced intervals, thus
improving voice quality.
• Click Jitter Buffer to expand.
• Type: PRASAR UCS supports two types of Jitter Buffer: Static and Dynamic. Static Jitter Buffer's internal
delay is static, whereas, the Dynamic Jitter Buffer's internal delay adapts itself to the jitter in the network.
Select the type of Jitter Buffer - Static or Dynamic - you want to use. If you selected Static Jitter Buffer or
Dynamic Jitter Buffer, you may set the 'Minimum Delay'. The value configured in the Minimum Delay
determines the size of the Static/Dynamic Jitter buffer.
• Minimum Delay (msec): This parameter is to be configured for both Static and Dynamic Jitter Buffer. The
Minimum Delay determines the size of the Jitter Buffer. When Jitter Buffer type is selected as Static, the
Minimum Delay defines the size of the Static Jitter Buffer. The Static Jitter Buffer will store each received
voice packets for the time you set and then it will send it to DSP for voice processing.
When Jitter Buffer type is Dynamic, the Minimum Delay specifies the minimum time for which the Dynamic
Jitter Buffer will store the received voice packet before sending it to the DSP for voice processing.
'Minimum Delay' can be from 10 to 280 milliseconds. By default Minimum Delay is set to 40 milliseconds.
• Click Submit.
Fax
The system supports sending/receiving of fax over SIP Trunks. You to select the protocol of Fax over IP (FoIP).
• Fax Type: The PRASAR UCS supports the fax options: None, T.38 (UDPTL), T.38 (RTP), and Pass
Through.
If you select None, the server will not detect the fax tone.
If you select any other option both, calls and fax tone will be detected.