I am a college student in Polithecnic Caltex of Riau in Indonesia. I am in the third years now. In my last project, I want to build the VOIP with TLS system at my college because i think it is interesting. I have studied about it since one month , but i get many problems to undestand about the system. Here is some obstacles questions about the system that i have met: 1. How can the attacker eavesdrop the communication in VoIP (The way)? 2. How can TLS prevent the attacker to eavesdrop the communication? 3. How can TLS ensure the confidentially and integrity of communication? Why we don`t user other secure protocol? 4.Do all TLS` clients use Linux Operating System or they can use Windows? 5. How secure TLS to protect the communication?
That is all the obstacles questions that i have met. I do hope any body can help me to answer those question. Please help me. Thank you very much.
Sincerely yours,
Ferianto
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Hi Ferianto,
your question require large answers, so I will try to give you just some hints.
regards, bogdan
Ferianto monster wrote:
I am a college student in Polithecnic Caltex of Riau in Indonesia. I am in the third years now. In my last project, I want to build the VOIP with TLS system at my college because i think it is interesting. I have studied about it since one month , but i get many problems to undestand about the system. Here is some obstacles questions about the system that i have met:
- How can the attacker eavesdrop the communication in VoIP (The way)?
you can find a lot of info about this on the net - try googling.
- How can TLS prevent the attacker to eavesdrop the communication?
by encrypting the signalling
- How can TLS ensure the confidentially and integrity of
communication? Why we don`t user other secure protocol?
again, by encryption.
4.Do all TLS` clients use Linux Operating System or they can use Windows?
any OS
- How secure TLS to protect the communication?
TLS protects only the signalling part - for media (audio steam) you need different mechanism like SRTP.
That is all the obstacles questions that i have met. I do hope any body can help me to answer those question. Please help me. Thank you very much.
Sincerely yours,
Ferianto
Yahoo! FareChase - Search multiple travel sites in one click. http://us.lrd.yahoo.com/_ylc=X3oDMTFqODRtdXQ4BF9TAzMyOTc1MDIEX3MDOTY2ODgxNjkEcG9zAzEEc2VjA21haWwtZm9vdGVyBHNsawNmYw--/SIG=110oav78o/**http%3a//farechase.yahoo.com/
Users mailing list Users@openser.org http://openser.org/cgi-bin/mailman/listinfo/users
Dear all,
I want to force openser to ping all registered users with OPTIONS message, my configuration as follow, flag in location table is 512 for sip_nat_flag, and 513 for NAT. I can see the OPTIONS message send to the users and got replied for a few minutes, after that, it stop sending. Is there something I've done wrong?
Thanks
Ray
modparam("registrar", "nat_flag", 6)
modparam("registrar", "sip_natping_flag", 5)
modparam("nathelper", "ping_nated_only", 0)
modparam("nathelper", "natping_interval", 30)
modparam("nathelper", "rtpproxy_sock", "/var/run/rtpproxy.sock")
modparam("nathelper", "sipping_method", "OPTIONS")
modparam("nathelper", "sipping_from", "sip:keepitopen@xxxxxx.net")
if (nat_uac_test("31")) {
if (method == "REGISTER" || !search("^Record-Route:")) {
fix_nated_contact(); # Rewrite contact with source IP of signalling
if (method=="REGISTER") {
fix_nated_register();
} else if (method == "INVITE") {
fix_nated_sdp("1"); # Add direction=active to SDP
};
force_rport(); # Add rport parameter to topmost Via
append_hf("P-hint: Proxied\r\n");
setflag(6); # Mark as NATed
};
};
if (uri==myself) {
if (method=="REGISTER") {
if (!www_authorize("", "subscriber")) {
www_challenge("", "1");
exit();
};
Setflag(5);
save("location");
return;
};
alias_db_lookup("aliases");
if (lookup("location")) {
append_hf("P-hint: usrloc applied\r\n");
route(1);
return;
};
};
-
Bogdan-Andrei Iancu -
Ferianto monster -
Raymond Chen