QUESTION Wazo (17.17) and TLS/SRTP

[panachoi]

I've recently migrated to Wazo. I've got everything working, except SRTP.

I can take the same 2 lines, and connect via UDP, TCP, or TLS without problems. However, as soon as I enable SRTP on the phones (Zoiper/Linphone), and set encryption=yes on the line configuration in Wazo, I have no audio at all on the calls. I can see RTP packets when I set rtp debugging on:

[Jan 8 11:40:34] Got RTP packet from A.B.C.D:55744 (type 00, seq 000951, ts 3330468613, len 000160)
[Jan 8 11:40:34] Sent RTP packet to W.X.Y.Z:57018 (type 00, seq 021985, ts 3330467008, len 000170)
[Jan 8 11:40:34] Got RTP packet from W.X.Y.Z:57018 (type 00, seq 015598, ts 455560022, len 000160)
[Jan 8 11:40:34] Sent RTP packet to A.B.C.D:55744 (type 00, seq 008555, ts 455558416, len 000170)
[Jan 8 11:40:34] Got RTP packet from W.X.Y.Z:57018 (type 00, seq 015599, ts 455560182, len 000160)
[Jan 8 11:40:34] Sent RTP packet to A.B.C.D:55744 (type 00, seq 008556, ts 455558576, len 000170)

between the 2 phones, but no audio at all.

Removing encryption=yes from the Wazp line configuration and disabling SRTP on the client makes everything work again as expected.

I'm must be missing something obvious, but I dont know what it is.