Siemens optiPoint 420 standard - Adjusting Display Contrast; Adjusting Key Label Contrast; Adjusting Speakerphone to Room Acoustics

Phone Features
32
Speech
• Support for G711 (U and A Law), G723 and G729
• Configurable Jitter buffer support
• High Quality speaker phone functionality
• G711 Silence Suppression
• Audio codec G.722 offers a wider audio bandwidth resulting in major
improvement in the represented speech quality.
Call Features
• Call Reject
• Call deflection
• Call forwarding (Unconditional, On Busy, On no Reply)
1
• Call waiting
1
• Consultation
• Unattended Transfer
• Attended Transfer (Join)
• Local Conference (3 party, G711 only)
• Do not Disturb
•Hold
• Message Waiting
• MultiLine
• Call Park