[asterisk-users] SIP Encryption in China

[Leo Ann Boon]

Hi all,

Anyone has information on how Chinese equipment makers are encrypting 
the SIP signaling + media packets to avoid ISP firewalls? Recently, I 
was sent a sample FXS/O gateway with support for 3 flavors (Seawolf, 
etc) of such encryption. I don't believe they're using SIP/TLS and SRTP. 
At first glance, it looks like a simple shared key scheme, certainly 
without all the key management of SRTP.


Cheers.

Leo.