[Freeswitch-users] bidirectional SRTP

[Mathieu Rene]

Both the INVITE and the 200 OK have an a=crypto line. You need to know  
that only the rtp payload is encrypted, it is normal that you see the  
headers as-is.

Mathieu Rene
Avant-Garde Solutions Inc
Office: + 1 (514) 664-1044 x100
Cell: +1 (514) 664-1044 x200
mrene at avgs.ca




On 14-Dec-09, at 11:00 AM, Helmut Kuper wrote:

> Hello,
>
>
> today I found that my SRTP calls are only SRTP in one way (from snom  
> to FS). The other direction is still RTP (at least if I believe  
> wireshark). How can I get both directions using SRTP?
>
> I do a simple call to an announcement in FS.
>
> My SIP-profile has:
> <param name="inbound-late-negotiation" value="true"/>
>
> I followed the document of FS Wiki:
> http://wiki.freeswitch.org/wiki/Secure_RTP
>
> But it seems there is no ch_var like sip_has_crypto.
>
> Is there a way to have both directions/streams per leg using SRTP?
>
> Please find attached the pcap trace of my snom phone.
>
> There you can see that snom offers crypto to FS. FS sends an OK with  
> SRTP and RTP. When you look into the RTP data you see SRTP from snom  
> to FS and RTP from FS to snom.
>
>
> Any hints?
>
> regards
> Helmut
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