RTP Header Compression under a VPN IPSEC Connection

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May 31st, 2010
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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
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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:

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/V3PN_SRND/v3p_comp.html#wp1035253


And this netpro doc:

https://supportforums.cisco.com/docs/DOC-2498/version/2



HTH.


Regards,
Bill

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