RonR,
Thanks for your reply. I tried setting call forwarding from google voice line on sp1 and it worked fine without any issues. ie when someone calls to the google voice number the call gets forwarded to my cell phone without any issue.
The problem with forwarding the call is only on the line port, ie the incoming calls on the line port should be forwarded to my cell phone in US. The cell phone here does ring whenever I receive a call, however, there is no sound and I get some echo when I talk. Given the line is local Indian PSTN line from AirTel, I am thinking that this might be related to line settings. Once again the setup works if using the auto attendant and the issue is present only when I am forwarding the calls directly without AA.
Let me know if you have any other suggestions.
Thanks.
Sachin