sip dialer

TekSIP is a SIP Registrar and Stateless SIP Proxy for Windows.

Free Softphone for Windows. Works with any SIP/ VOIP provider and SIP PBX

Alexf's Dialup Dialer is advanced dialer for Windows

Softphone for PC-telephony using TAPI, CAPI or SIP plus answering machine

TekFax is a SIP (Session Initiation Protocol) fax receiver server runs under.

TekPhone is a SIP (Session Initiation Protocol) conference server

Command Line SIP User Agent for Windows

Freeware SIP interactive voice response system

Easy to use Free SIP Softphone for voip providers

mobile internet calls & IM for Skype, Google Talk, MSN & SIP over 3G/GPRS/Wifi