Synthetic quanto spread - margin. What discounting?

I have a question regarding quanto options in the interdealer market.

When a trader hedges his quanto risk in the interdealer market, he trades an ATM Synthetic Quanto Spread (the difference of 2 forwards)
Let's take a "quanto" structure: SPX quanto Euro.

[Call(S)_Dom - Put(S)_Dom] - [Call(S)_For - Put(S)_For]

S: is the foreign index (ex: SPX which is denominated in USD)
_Dom: as in domestic currency
_For: as in foreign currency

Now the question is, how are both legs discounted? OIS_Dom for the domestic option part and OIS_For for the foreign?
 
In all honesty, walk over to nuclearphynace or wilmott forums.

Most of ET users don't even know what a quanto is.

Obviously quanto is derogatory term for quants, as in “You lousy quanto stop stealing all my profits!”
 
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