SJphone® is a VOIP softphone that allows you to speak with any other softphone running on a PC/PDA, any stand-alone IP-phone, or using Internet Telephony Service Provider (ITSP) with any traditional wired or mobile phone. It supports SIP and is fully inter-operable with most major VOIP vendors and ITSPs.
SJphone for WLAN-PDA with Windows CE(stable):
SJphone CE .cab for Pocket PC 2003+ v.1.60.303c, 10.26.05
SJphone CE .exe for Pocket PC 2003+, v.1.60.303c, 10.26.05
SJphone CE .cab for Pocket PC 2003SE+, v.1.60.303c, 10.26.05
SJphone CE .exe for Pocket PC 2003SE+, v.1.60.303c, 10.26.05
SJphone User Guide for Pocket PC 2003 (.pdf, 0.6M)
Experienced users may want to install
SJphone Advanced Help (self-extracting help file, 1.7M).
It works with any SJphone, but may be installed and de-installed separately.