Yes, that's correct and more precisely, old RFC compliant UAs require the To and From to be unaltered, while RFC3261 compliant UAs require the tags in To and From to be unaltered. As RFC3261 specifies backwards compatibility as a requirement, any altering of To or From (except the anonymous exception) will cause non-RFC3261 compliance.
g-)

Alexandr Dubovikov wrote: 
On Mon, Aug 21, 2006 at 11:39:40AM -0400, Sammy Touati wrote:
  
Hi,

Can the To and From fields in a SIP INVITE message be modified in SER?
I know that the Request URI can be modified but i also need to modify the To
field.
    

replace or subst

but be careful, because To, From and Call-ID make a "call leg" of
transacation.


  
Thanks.

sato.
    

  
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