Yealink SIP-T2 Series, Руководство администратора

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Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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The LCD screen prompts “No Service” message when there is no available SIP account
on the IP phone.
Do one of the following:

Ensure that an account is actively registered on the IP phone at the path
Menu->Status->Accounts.

Ensure that the SIP account parameters have been configured correctly.
A remote phone book is placed on a server, while a local phone book is placed on the
IP phone flash. A remote phone book can be used by everyone that can access the
server, while a local phone book can only be used by a specific phone. A remote phone
book is always used as a central phone book for a company; each employee can load
it to obtain the real-time data from the same server.
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).