[Freeswitch-users] Accepting an "optional" SRTP offer (crypto in RTP/AVP) and establishing SRTP

[William Simon]

Michael, are you aware of a bug that would cause this behavior in 1.6.20? Just trying to narrow down whether we are up against a bug or a configuration error on our part.


> On Oct 12, 2018, at 6:00 PM, Michael Jerris <mike at jerris.com> wrote:
>
> Are you trying this on 1.8.2 version?
>
>> On Oct 5, 2018, at 10:27 AM, William Simon <wsimon at stratusvideo.com> wrote:
>>
>> We are working with an endpoint that offers optional SRTP in the non-RFC-compliant way of an a=crypto attribute within RTP/AVP.
>>
>> I have told FreeSWITCH to allow this with rtp_allow_crypto_in_avp=true at the right place in the dialplan.
>>
>> Immediately after that in the dialplan I have to reject SRTP by using rtp_secure_media=forbidden, otherwise the call setup still fails. By setting the value to forbidden, the call does proceed unencrypted.
>>
>> We want FreeSWITCH to proceed with media encryption. Setting rtp_secure_media to any other value results in FreeSWITCH rejecting the offer like this:
>>
>> v=0
>> o=FreeSWITCH 1538660754 1538660755 IN IP4 192.168.100.104
>> s=FreeSWITCH
>> c=IN IP4 192.168.100.104
>> t=0 0
>> m=audio 0 RTP/AVP 19
>> m=video 0 RTP/AVP 19
>>
>> Is there anything else I can do to force SRTP in the answer?
>>
>>
>
>
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