Nortel Networks NN44470-100 manual Conferencing, Quality of Service

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MAS commissioning

— RFC2833

Attention: If you remove all methods, inband DTMF detection is forced, which is not recommended because it degrades system capacity.

•Configure the preferred order of enabled DTMF relay methods for negotiation (SDP answer) or default SDP (SDP offer).

•Configure the RFC2833 payload type. Nortel recommends that you select the default payload type, which is determined dynamically. However, some clients require a fixed payload type.

Conferencing

To configure conferencing, use the Nortel MAS Console. You can configure the following conferencing properties:

•Enable or disable the Automatic Gain Control. The default is enabled.

•Enable or disable the Customized Replacement Video property. When enabled, customer-supplied replacement video files are used. The default selection is enabled.

•Enable or disable the Lock Video Format on First Party in Conference property.

When enabled, the first party determines the video format. If the first party is audio-only, the conference has no video. When disabled, the first party with active video determines the video format. The default is enabled.

•Enable or disable the Replacement Video For Active Speaker property. When enabled, the active speaker receives replacement video in conferences where one or more than two (but not two) parties are enabled to speak. The default is enabled.

•For the Silent Conference Teardown Delay (sec) property, configure the number of seconds a conference must be silent before it is terminated (0 indicates no termination). The default value is one hour.

Quality of Service

MAS supports Differentiated Services (DiffServ) packet marking on outgoing Real-time Transport Protocol (RTP) streams. The system sets the DiffServ Control Point (DSCP) to expedited forwarding (EF), which is a widely supported indicator for QoS-enabled networks carrying real-time audio and video data. Network routers that are QoS-enabled examine the type of service bits in the IP header and provide priority (with respect to routing and handling) to those packets marked with expedited forwarding. In addition to marking packets, MAS uses high resolution, interrupt-driven timers to drive RTP packetization at precise intervals.

Nortel Media Application Server 6.0 for AS 5300

Fundamentals

NN44470-100 01.01 Standard

Release 6.0 03 June 2008

Copyright © 2008, Nortel Networks