[Freeswitch-users] optional SRTP

Brian West brian at freeswitch.org
Fri Feb 22 19:27:20 MSK 2013

crypto in RTP/AVP is invalid per the spec.

You are required to send two rtp profiles one with RTP/AVP or RTP/SAVP

To get around this in your broken device you can set the variable sip_allow_crypto_in_avp or set profile param NDLB-allow-crypto-in-avp

Brian West
brian at freeswitch.org
FreeSWITCH Solutions, LLC
Brookfield, WI 53008-2531
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On Feb 22, 2013, at 10:08 AM, Ken Rice <krice at freeswitch.org> wrote:

> FreeSWITCH Support SIP/TLS, SRTP and ZRTP, the error message you are refering to below is where someone has improperly implemented SRTP and is sending the crypto headers in the wrong spots. See the Wiki for setting up secure calling.
> Also please note, if you are going to use SRTP, you _must_ use SIP/TLS as the keys for SRTP are passed in the SDP of the SIP messaging. You can use ZRTP without using SIP/TLS as the key exchange for ZRTP happens as a DH exchange in the ZRTP stream, but if you want to protect the contents of the SIP messaging you’ll still want to use SIP/TLS.
> K

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