> Is record-route returned in 183? 
> (or only in the final response that follows
> such as 200)?

Table 3 of rfc3261 reflects that record-route 
is optional within 18x/2xx.

If you plan to record-route the 2xx, you
should also record-route the 18x.  Otherwise
requests after 18x and prior to 2xx will
bypass your proxy.  Such requests might be
BYE, UPDATE, INFO, PRACK, etcetera.

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