09-16-2008 12:14 AM - edited 03-15-2019 01:17 PM
Hi,
I have implemented voice encryption on my Cisco ip phones.
However,i captured the network traffic during a conversation and i don't see rtp (or SRTP)p packets in my capture.
Only a lot of UDP packets and this only during the converstation,so when people actually are speaking.
Anyone who has an idea? Is this correct behaviour?
I should be able to find an SRTP stream or something so i can rebuild the voice stream?
I want to test if the encryption is ok,so i need to hear anything except voice :)
Thanks for some feedback.
Kurt
09-16-2008 12:42 AM
HEre is the document you are looking for:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/4_1_2/secutrbl.html#wp1056508
09-17-2008 01:03 AM
Hi,
Thanks for your feedback.
This info seems very usefull...however,i'm using CUCM 6.1 (forgot to mention).
Or does that makes no difference?
From what i understand from the document,is that i only need to put the packet capture mode to batch processing mode (only option in 6.1) and i should be able to see the SRTP packets after my sniffer?
Kurt
09-17-2008 01:44 AM
more news,in my sniffer,i selected "decode as RTP" and now i see the rtp packets with thier payload type.
If i want to save the (both directions) stream in a .au file,i get the error message "Can't save in a file:saving in au format supported only for alaw/ulaw streams"
This works fine normally when you try to analyse an unencrypted RTP stream.
Any advise?
Thanks,
Kurt
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