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We need softphone client with encryption
Need these features.
Softphone with G.729 codec
Codec Supported Microsoft G723.1/G711
Countdown call timer
Last Number Redial
Local signaling (Dial tone, busy, ring back, etc.) for user comfort
Microsoft Outlook Sync with Address Book
Micro Phone Volume Control
Speaker Volume Control
Speaker and Volume Progress bar
Work with any full-duplex sound card
UPNP NAT/Firewall support, stable SIP RTP ports
Auto-configuration of settings for easy deployment