Siemens 300Series 사용자 설명서

 Using Your Phone

A ROLMphone speakerphone only allows voice transmission in one 
direction at a time. Therefore, you and the other party cannot talk 
simultaneously. Also, if you are speaking you may not hear voice 
interruptions or background noise, but this does not mean your call has 
been disconnected.

If the noise level in your room is high, or the other party is speaking 
too softly, you can increase the other party’s voice volume by pressing 
the Volume Up ▲ key. If the other party’s voice is too loud, you can 
increase your ability to interrupt by pressing the Volume Down ▼ key. 
If the volume adjustment cannot compensate for the high noise level, 
you can use the handset to continue the conversation.

Since the speakerphone’s microphone is located underneath the right 
front side of the telephone, objects need to be kept away from that area 
to ensure clear transmission. Also, if your telephone is near a large 
object that reflects sound and you are further away from the telephone 
than the object is, your voice volume may be reduced and your voice 
may sound hollow to the other party. However, the party should still 
be able to understand you.