Non Immigrant Visa Extension

[metice]

I currently work as a volunteer for a foundation. I have a valid work permit and non-immigrant visa which is due to expire later this month. I have had 2 x 1 year extensions to this visa already, which were issued by Bangkok immigration office. I'm assuming that I can extend it for another year but I need to know if it's possible for someone from my foundation to make the application with all of the necessary paperwork? (I will be out of town). Are there any extra forms that I would need to sign?

Thanks

[Soutpeel]

Cant see any reason why not in all these years I have never had to appear in person to renew, with the exception of two of those years where I turned up they looked at me, looked at the photo in the WP and PP and that was it., done

[Mario2008]

Be sure to sign all forms and photo copies.