What you need is a session border control.
Try this link from Jasomi :
http://www.jasomi.com/ppfes.html
or this from Kagoor ( now Juniper )
http://www.juniper.net/customers/support/products/vf1000.jsp
Federico Giannici ha scritto:
Considering that we DON'T want to use an RTP Proxy
(bad scalability,
waste of bandwidth and longer delays), is there any solution to the
"hairpin" problems?
Are there any "boxes" that look at the SIP messages and short-circuit
calls from and to the local network?
Thanks.