Restamping for H1B Visa - Help Needed

[rinkysmile]

I came to US through company A in 2004. My passport has the visa stamped for company A. As per the passport the Visa is getting expired on Nov 2006. Last month I have changed to Company B. The expiry date for my petition I-797 with company B is till 2009. I am going to India on september. I guess I have to take an appointment date and go though the visa stamping procedure again for this new company B. My question is since its extension of visa (within the 6 yrs period) Do I have to go for the personal interview just like a new H1 or I can send my passport with the required documentation to the consulate ?

I didnt find any details on VFS site on this. I will appreciate your help.

Regards,
Rinky