Stock Android SIP client set up

Native SIP clients available on some 2.3/4.0 phones. To enable it:

1. Settings -> Internet call settings
2. Click Accounts, then click "Add account" button
3. • User Name: 888XXXXXXX (Your VOIP account number given by you VOIP service provider)
   • Password: XXXXX (Your VOIP password)
   • Server: sip.pennytel.com (Your VSP's sip server)
   • Tick set as primary account

Now you should be able to make calls through your VOIP if WIFI is enabled. (VOIP via 3G is disabled.)