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"Your product works fine. I set up a combination of Sipura 3000, an Asterisk gateway, your product and skype. We have now the missing link between regular PSTN traffic and a regular skype user."
Erik P.
Read all testimonials - "VideoPhone To Go" - SIP/H.323 VideoPhone for PDA

"VideoPhone To Go" - SIP/H.323 VideoPhone for PDA details introduces Video SoftPhone (Videophone) for Windows Mobile-based PDAs.
SoftPhone supports Windows Mobile 5.0, Window Mobile 6.0, Window Mobile 6.1.

We offer customized SIP or H.323 Softphone version (so-called "white label") for Windows Mobile 5.0/6.0. Feel free to contact us.

"VideoPhone To Go" is available for $39.99 and at Handango!

   1. Features
   2. Demo version
   3. F.A.Q.
   4. Screenshots

1. Feature list

  • SIP
  • H.323
  • G.711-uLaw-64k
  • G.711-ALaw-64k
  • H.261
Protocol features
  • SIP registration
  • H.323 gatekeeper
  • STUN (to bypass NAT/firewall)
  • Video sending/receiving for SIP and H.323 in QCIF format

2. Demo version

Demo version with limitation (5 min maximum call duration) is available here:

3. F.A.Q.

Q. Do you have a list of compatible PDAs?
A. Well, there are nore then hundred of Windows Mobile PDAs, so it is quite difficult to test all of them. We have a list that is periodically updated:
  • Windows Mobile 5.0 (320x240)
  • Windows Mobile 6.0 (320x240,640x480)
  • Windows Mobile 6.1 (320x240,640x480,480x800)
  • Acer Tempo F900
  • Rower PC Evo X10
  • ASUS P750/P527
  • ETen Glofish DX900
  • HTC Touch
  • HP iPAQ
  • Toshiba and HTC devices

Q. What bandwidth does "VideoPhone To Go" need?
A. It depends on codecs. Table below shows bandwidth in one direction:
Type Codec Bandwidth
Only audio G.711 70 kbits
Audio+video (5 frames/sec) G.711+H.261 95 kbit
Audio+video (10 frames/sec) G.711+H.261 110-115 kbit

Q. Why there is no support for H.263 and H.264 codecs?
A. CPU in PDA is not so powerful as in regular PC. So PDA can't make realtime H.263 and H.264 encoding. Althoug we are looking for H.263 and H.264 implementation that can be used at PDA.

Q. Why there is no support for G.728 & G.722.1 codecs?
A. G.728 anf G.722.1 codecs requires licensing. With those codecs price for "VideoPhone To Go" will be higher. GSM, iLBC and Speex codecs are fine for low-speed channels.
Nevertheless G.728 & G.722.1 codecs can be added on special request.

Q. What video conferencing systems has VideoPhone To Go been tested with for compatibility?
A. "VideoPhone To Go" with Polycom, Tandberg, Aethra, VCon and Cisco products.

4. Screenshots


Latest news

February 22, 2010.
New version of H.323/SIP SoftPhone released
February 21, 2010.
New version of H.323/SIP MCU (Conference Server) released
October 2, 2009.
Press about us
May 18, 2009. is one of the Top 10 Finalists of Cisco Developer Contest !!!
March 20, 2009. introduces H.323/SIP Video Softphone for PDA - Windows Mobile 2003/5.0/6.0 Video SoftPhone for SIP and H.323 networks
July 14, 2008. introduces "Web-2-Phone" - Flash-based phone with SIP/H.323/Skype support
July 19, 2007.
PSGw 3.5 (SIP version) demo released
February 1, 2007.
PSGw for Linux 1.6 (SIP version) released
January 1, 2007.
Merry Christmas and Happy New Year!
July 24, 2006.
PSGw for Linux 1.5 (SIP version) released
July 18, 2006.
PSGw 3.5 Standard and Pro now has unique feature - arbitrary SIP destination!
July 1, 2006.
PSGw 3.3 Pro (SIP and H.323 version) allows to set SIP and H.323 DTMF type
June 29, 2006.
PSGw 3.3 Standard (SIP version) allows to set SIP DTMF type
June 20, 2006.
PSGw for Linux 1.2 (SIP version) is released for beta-testing!
May 18, 2006.
Updated PSGw has codec management feature and prefix for Skype username


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