Cisco 8832 Wartungshandbuch - Seite 5

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Auch für Cisco 8832: Firmware Migration Master Manual (31 seiten), Benutzerhandbuch (20 seiten), Schnellstart-Handbuch (2 seiten), Handbuch (30 seiten), Installationshandbuch (39 seiten), Schnellstart-Handbuch (16 seiten), Schnellstart (2 seiten), Einstellungen (14 seiten), Schnellstart-Handbuch (2 seiten), Handbuch zur Rekonfiguration (2 seiten), Schnellstart (2 seiten), Handbuch (30 seiten)

Maintenance

Metric Change

Conceal Ratio is near or at zero, but the voice quality

is poor.

MOS LQK scores decrease significantly

MOS LQK scores increase significantly

Note

Voice quality metrics do not account for noise or distortion, only frame loss.

Voice Quality Reporting

You can capture voice quality metrics for Voice over Internet Protocol (VoIP) sessions with a Session Initiation

Protocol (SIP) event package. Voice call quality information derived from RTP and call information from

SIP is conveyed from a User Agent (UA) in a session (reporter) to a third party (collector).

The Cisco IP phone uses User Datagram Protocol (UDP) to send a SIP PUBLISH message to a collector

server.

Currently, only the basic call scenario supports voice quality reporting. A basic call can be a peer to peer

incoming or outgoing call. The phone supports periodic SIP publish message.

Condition

• Noise or distortion in the audio channel such as

echo or audio levels.

• Tandem calls that undergo multiple

encode/decode such as calls to a cellular network

or calling card network.

• Acoustic problems coming from a speakerphone,

handsfree cellular phone or wireless headset.

Check packet transmit (TxCnt) and packet receive

(RxCnt) counters to verify that voice packets are

flowing.

Network impairment from packet loss or high jitter

levels:

• Average MOS LQK decreases may indicate

widespread and uniform impairment.

• Individual MOS LQK decreases may indicate

bursty impairment.

Cross-check the conceal ratio and conceal seconds

for evidence of packet loss and jitter.

• Check to see if the phone is using a different

codec than expected (RxType and TxType).

• Check to see if the MOS LQK version changed

after a firmware upgrade.

Maintenance

Voice Quality Reporting