Troubleshooting
773
“
tftp://[IPv6 address or domin name]
”. For example, if the provisioning server address is
“2001:250:1801::1”, the access URL of the provisioning server can be
“tftp://[2001:250:1801::1]/”. For more information on provisioning, refer to
Yealink_SIP-T2_Series_T19(P) E2_T4_Series_CP860_IP_Phones_Auto_Provisioning_Guide
.
Press the volume key to increase or decrease the ringer volume when the IP phone is
idle, or to adjust the volume of engaged audio device (handset, speakerphone or
headset) when there is an active call in progress.
If you have poor sound quality/acoustics like intermittent voice, low volume, echo or
other noises, the possible reasons could be:
Users are seated too far out of recommended microphone range and sound faint,
or are seated too close to sensitive microphones and cause echo.
Intermittent voice is mainly caused by packet loss, due to network congestion, and
jitter, due to message recombination of transmission or receiving equipment (e.g.,
timeout handling, retransmission mechanism, buffer under run).
Noisy equipment, such as a computer or a fan, may cause voice interference. Turn
off any noisy equipment.
Line issues can also cause this problem; disconnect the old line and redial the call
to ensure another line may provide better connection.
If the caller and receiver cannot hear anything - there is no sound at all when the other
party picks up the call, the possible reason could be: the phone cannot send the
real-time transport protocol (RTP) streams, in which audio data is transmitted, to the
connected call.
Try to disable the 180 ring workaround feature. For more information, refer to 180 Ring
Workaround on page 290.
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