Unfortunately I have not test this option, I have only tested with Asterisk 1.6.1.10 calls between extensions, soon I’ll put into production…
Regards
Version 1.6.1.11 works fine also!
What is even more important is that you can now set;
maxdatagram=400
in sip.conf which solves my T38 fax problem with my VOIP Provider.
Very nice 
xDD, I’ll keep in mind when upgrading to 1.6.1.11, next week.
Thanks for the advice