[Asterisk-Users] SIP security

[Tomislav Parcina]

I have * server that has public IP. Some users with their softphones 
(and other with hardphones) need to connect to that * server and call 
out thrue Zap lines. As far as I know when someone tries to authenticate 
to * server using SIP protocol, he sends data in plain text format. 
Right? How can I protect * server from snifers?

I would like to use SJphone softphone for above purpose.


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Tomislav Parcina
name.surname at email.t-com.hr