RTP Header Compression under a VPN IPSEC Connection

Unanswered Question
May 31st, 2010

Is it possible to compress the RTP, UDP and IP headers of a voice packet under a VPN IPSEC connection? These headers are encrypted when IPSEC is set to use ESP.

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William Bell Mon, 05/31/2010 - 07:41

I believe these two protocols are incompatible.  cRTP compressess the IP/UDP/RTP headers.  ipsec encrypts these headers.  So, by the time the RTP compression process could be engaged it cannot accomplish it's job successfully.

See this reference:


And this netpro doc:




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cfujimura Mon, 05/31/2010 - 08:12

I suspected that it would not be possible with ESP as the encryption process. I´ve confirmed now. Thanks for the help.


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