However, if the receiving client has the full knowledge of the network, nothing prevents it from implementing policies like "accept only from certain IP address" etc for better security.
Regards Satya T -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of T Satyanarayana-A12694 Sent: Friday, July 31, 2009 9:35 AM To: Vivek Batra; sip-implementors@lists.cs.columbia.edu Subject: Re: [Sip-implementors] Should IP address of sender be restrictedtolisten for RTP packets? Vivek, The IP address published is for listening only. Sending may or may not happen from the same address depending on sender's signaling/media architecture and type of NAT. >> Actually what happens in absence of this restriction, my SIP client start mixing the RTP packets received >> from any IP address! Why would mixing happen here? There would be different SSRCs, different set of sequence numbers and timestamps. And why would multiple sources send to the same destination port for a two-way call? Regards Satya T -----Original Message----- From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Vivek Batra Sent: Thursday, July 30, 2009 5:41 PM To: sip-implementors@lists.cs.columbia.edu Subject: [Sip-implementors] Should IP address of sender be restricted tolisten for RTP packets? Hi list, Just a small query! During SIP signaling, when SDP offer/ answer completes, calling SIP device starts sending RTP to the IP:Port recieved in SDP answer from called party. Calling SIP device opens its UDP port (for RTP) sent in the SDP offer. Now, should calling SIP device listens for RTP packets on its UDP port (which its advertise in SDP offer) from any IP Address, OR Should calling SIP device listens for RTP packets on its UDP port only from IP Address recieved in SDP answer from called party? Does this makes sense to restrict SIP device to listen for RTP packets on its UDP port only from IP Address recieved in SDP answer from called party (not assumed any NAT scenerio :)) Actually what happens in absence of this restriction, my SIP client start mixing the RTP packets recieved from any IP address! Any suggestion?? Best Regards, Vivek Batra _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
