Enigma is a free Session Initiation Protocol (SIP)
BSEditor: Enigma is a free Session Initiation Protocol (SIP) softphone available for your download. It can used to make Internet calls, establish conference and send instant messages to your buddies under the same SIP network. Choose your platform see features So whether your just having a simple voice conversation or talking to a friend over Instant Messaging, Enigma will leads you to a new path of communications.

Features:

Call, Redial, Hold

Auto Answer

Auto Conference

Dial Pad

Call History (Dialed Calls, Received Calls, Missed Calls)

Manage Groups (Add, Edit, Remove)

Manage Groups (Add, Edit, Remove)

Sorting (by Contact Name, by Contact Number)

Show Contacts

Account User Status (Auto Detect, Available, Busy, On the phone, Idle, Away, Offline)

Availability Settings (including Availability Message)

IM or chat messaging you can free download Enigma Softphone 0.8.8 now.