Cisco Unified MeetingPlace Express, Release 2.x -- Field Reference: Media Parameters

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This page enables you to modify settings for the Cisco Unified MeetingPlace Express audio mixer and for video.


Table: Fields on the Media Parameters Page
Field Description Value

Media Parameters

Maximum jitter buffer (milliseconds)

Maximum length of time, in milliseconds, that the RTP jitter buffer holds voice packets.


If voice packets are held in the jitter buffer for too short a time, variations in delay may cause the buffer to underrun (become empty) and cause gaps in speech. On the other hand, packets that arrive at a full buffer will be dropped, which also causes gaps in speech.


When voice data is sent across the network, packets can be delayed. At the sending side, Real-Time Transport Protocol (RTP) packets are sent in a continuous stream with the packets spaced evenly apart. Due to network congestion, improper queuing, or configuration errors, the delay between each packet can vary instead of remaining constant. The variation in the delay of received packets is called jitter.

Range: 100 to 250


Default: 250

RTP starting port

Lowest port number to which RTP packets are sent.

Range: 16384 to 32526


Default 16384

Audio media QOS

Layer 3 traffic classification applied to RTP packets to differentiate the voice packets from data packets.


Recommendation: Keep the default value of this field. The other values are available for the rare instances when the network requires a different DSCP setting.


For more information about enabling QoS and DSCP in a network, see the "Network Infrastructure" chapter of the Cisco IP Telephony Solution Reference Network Design (SRND) for Cisco Unified CallManager 4.0 and 4.1.

Choose from the options in the drop-down menu


Default: EF DSCP (101110)

TTL

Time to live, in hops, for transmitted voice packets.

Range: 1 to 64


Default: 64

RFC2833 payload type

Payload type for RFC2833 digits, tones, and signals.


Recommendation: Contact your network administrator for the payload type used in your network.

Range: 96 - 127


Default: 101

Voice activity detect

Whether to accommodate background noise when determining who is the active speaker.

  • If you select Yes, the performance of the audio mixer may degrade somewhat, because the voice activity detect process is CPU intensive.
  • If you select No, the active speaker is selected without any consideration to the background noise level.

Yes/No


Default: No

Video Parameters


Video media QOS

DSCP setting for video streams.


Recommendation: Keep the default value of this field. The other values are available for the rare instances when the network requires a different DSCP setting.


For more information, see Audio media QOS.

Choose from the options in the drop-down menu


Default: AF41 DSCP (100010)

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