AGEphone

AGEphone is a software that allows you to make and receive phone calls from your PC. 

It offers a lot of features that come in handy, like importing your address book from Outlook, a speed dial function, an answering machine, call melodies, simultaneous use of multiple services and many more. It's VoIP engine "microSIP stack", an original SIP parser and IP packet processing program make operation at super small size and with super light weight possible, while ensuring great sound quality through a newly developed packet buffering. 

AGEphone funcitons include: 

# High quality sound, low delay buffering
# The world's smallest and lightest VoIP stack
# UPnP, STUN Support for NAT Traversal
# Possibility to simultaneously use multiple Services
# Support of Multi-network interfaces (NIC), including VPN
# Answering Machine
# Click to Call Function
# DND(Do not Disturb) 
# Hold
# VAD (Voice Activity Detection) with fade-out
# Voice Jitter Absorption
# Call History
# Number Auto Complete
# Different skins
# Address Book, Outlook Support
# Speed Dial Function
# Inband/RFC2833 DTMF send
# Call Melodies
# Multiple Codecs
# Voice Recording

AGEphone is based on and fully complies to the following international standards:

# RFC3261: SIP: Session Initiation Protocol
# RFC2327: SDP: Session Description Protocol
# RFC1889: RTP: A Transport Protocol for Real-Time Applications
# RFC2833: RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
# RFC3489: STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network # Address Translators (NATs)
# RFC3581: An Extension to the SIP for Symmetric Response Routing
# UPnP :Universal Plug and Play IGD