1.How Can we call SIP number from PSTN network?2.what is the best way to access voip while on road or move?

2. - You can either take your ATA (voip modem) with you, or a mini-version that the voip company probably sells.

Your phone number is connected to the ATA / voip modem, not your ISP or anything else.

The rest... either I don't know or it's a matter of where you live.

While I'm here -

Download a few anti-virus and anti-spyware programs, oh and a firewall.

( Avg antivirus - http://free.grisoft.com/ , Adaware anti-adware - http://www.lavasoftusa.com/software/adaware/ , Spywareblaster antispyware - http://www.javacoolsoftware.com/spywareblaster.htm... , Zonealarm firewall - http://www.zonelabs.com/store/content/company/prod... )

It's almost guaranteed you got some nasties through either just using Internet Explorer, or downloading stuff you shouldn't.

Internet Explorer is big, slow, insecure (you're almost guaranteed to have some viruses and spyware right now), very out of date, and not customizable.

Drop Internet Explorer from use and get Firefox - sleek, fast, safe, easy to use, up to date, extremely customizable... and it has a cool icon.

( Firefox web browser - http://getfirefox.com/ )

Firefox has pop-up blocking built in, and with just one add-on you'll rarely see another banner ad!

(Firefox adblocking add-on - http://adblockplus.org/ )

Install the programs and scan your computer. You might want to stay offline for this - you're not protected until AFTER you do it.

After that - password protect your computer account. If you use a wireless connection see if you can get it secured (passwords and encryption)

Make sure to update your virus and spyware scanners once a week, and check for updates to your firewall... and operating system.

Questions? Comments? E-mail me at amandakerik at yahoo dot com.