Quadro SW-Version 4.1.x Installationsanleitung PDF herunterladen (Seite 42)

QuadroISDN Manual II: Administrator's Guide Administrator’s Menus

QuadroISDN; SW Version 4.1.x 42

RTP Statistics

The RTP Statistics page provides detailed information about the

established call is provided.

Quality - estimated call quality, which depends on RTP statistic.

Below is the legend for Call Quality definitions on the displayed RTP

Statistics:

excellent – RX Lost Packets < 1% & RX Jitter < 20

good - RX Lost Packets < 5% & RX Jitter < 80

satisfactory - RX Lost Packets < 10% & RX Jitter < 150

bad - RX Lost Packets < 20% & RX Jitter < 200

very bad - RX Lost Packets > 20% or RX Jitter > 200

Fig. II-73: RTP Statistics page

Rx/Tx Codec - codec for received and transmitted RTP stream respectively.

Rx/Tx Packets - number of RTP packets received and transmitted respectively.

Rx/Tx Packet Size - size of RTP packet (payload) received and transmitted respectively.

Rx Lost Packets - number of lost RTP packets for received stream.

Rx Jitter - inter-arrival jitter is an estimate of the statistical variance of the RTP data packet inter-arrival time, measured in timestamp units.

The inter-arrival jitter is defined to be the mean deviation (smoothed absolute value) of the difference D in packet spacing at the receiver compared

to the sender for a pair of packets. If Si is the RTP timestamp from packet i, and Ri is the time of arrival in RTP timestamp units for packet i, then for

two packets i and j, D may be expressed as:

D(i,j) = (Rj - Ri) - (Sj - Si) = (Rj - Sj) - (Ri - Si)

J(i) = J(i-1) + (|D(i-1,i)| - J(i-1))/16, where J(i) is Rx Jitter for packet i.

For more details about Jitter calculations, please refer to the RFC1889.

Rx Maximum Delay - maximum variance (absolute value) of actual arrival time of the RTP data packet compared to estimated arrival time,

measured in milliseconds.

If Si is the RTP timestamp from packet i, and Ri is the time of arrival in RTP timestamp units for packet i, then variance for packet i may be

expressed as following: V(i) = |(Ri - R1) - (Si - S1)| = |(Ri - Si) - (R1 - S1)|

Rx Maximum Delay = max V(i) / 8

RX Delay Increase Count – indicates the number of times the delay in jitter buffer is increased during the call.

RX Delay Decrease Count - indicates the number of times the delay in jitter buffer is decreased during the call.

Please Note: RTP Statistics is logged only when at least one of the call endpoints is located on the Quadro. For example, it will not be logged when:

• calls incoming from or addressed to the IP lines or remote extension,

• calls from an external user are routed to another external user through Quadro’s routing rules.

In the first case, RTP statistics will be logged if remote extension or IP line user is calling locally to the Quadro’s extension or auto attendant.

SIP Settings

The SIP Settings provide information on the SIP receive UDP and TCP ports and allows you to select DNS server configurations for SIP and the SIP

timers scheme.

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