Use the following setting, this the default setting for Airtel Live.
For Airtel Live:
Access Point Name: airtelfun.com
Use Proxy: YES
Proxy Address: 100.001.200.099
Proxy Port: 8080
Homepage: http://live.airtelworld.com/
Or to get the ALL settings from Airtel - sms "ALL" to 52567
then Airtel will send you all the setting i.e settings for Airtel Live, Airtel GPRS, Airtel MMS etc.