zrtp passthru requires the zrtp-hash in the SDP on invite and the 200OK from the remote end, I highly suspect you're using a client that doesn't include this sdp attribute and the reason you have to force proxy media on.

/b


On Mon, Feb 27, 2017 at 11:19 AM, Sergey Safarov <s.safarov@gmail.com> wrote:
Hello Michael
I confirm that zrtp paththrue is not work as expected and required to enable proxy media from zrtp code match on sip device's 

пн, 27 февр. 2017, 19:32 Michael Jerris <mike@jerris.com>:
what are “custom algorithms”?


> On Feb 26, 2017, at 9:01 PM, Richard Chan <richard@treeboxsolutions.com> wrote:
>
> Hi,
>
> The use case is: customer wants the ability to use custom algorithms in their UAs (don't ask!?) without a crypto bridge in the B2BUA. Any suggestions? Originally, I thought proxy media would do the trick - pass media packets without any attempt at interpretation but I noticed RTCP wasn't being  activated (I think it was back in the 1.2.x days, I have an ancient 1.2.5 that does activate RTCP). Any suggestions?
>
> ( We haven't looked at ZRTP fully, but validating the session string/PIN seems to make it a non-starter in the customer's use case.)
>
> ​Richard


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