> This way, when A gets the Refer-To [EMAIL PROTECTED], it would just send
> its subsequent INVITE to the proxy resposible for whatever.com which will
> then forward it to C.
>
> Furthermore, I would've thought that using the addr-of record is always 
> the
> safer option as it would always get resolved and forwarded to the right 
> place
> eventually.  Is this not true?

No, because it is not guaranteed that [EMAIL PROTECTED] routes to the UA 
instance that C was using in the call with B. It may end up at some other 
device, or e.g. go to voice mail

Regards,

Jeroen

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