[Serusers] Forwarding source address

[Alistair Cunningham]

We'd like to forward the source address that a request came from in a 
header, something like:

X-Source-Address: 192.168.1.1

Is there a neat way to do this? An append_sourcehf( "X-Source-Address" ) 
would be ideal. If worst comes to worst, we can always extract it from 
the c= after doing fix_nated_sdp(), but we'd prefer something less ugly!

-- 
Alistair Cunningham,
Integrics Ltd,
+44 (0)7870 699 479
http://integrics.com/