[SR-Users] rtpengine no voice when working between DTLS-SRTP endpoints

[Aqs Younas]

Greetings list,

I am trying to make two endpoints talking on DTLS-SRTP. But I hear on
audio.

Things work perfectly fine if I use RTP or SRTP with TLS.

Endpoints are pjsip based application not webrtc based clients.


Below are logs from rtpengine. I hope someone could point out amiss.

Apr  9 20:02:43 centos-1024mb-nyc-02 rtpengine[58438]: INFO:
[66d2da58-21fe-48bd-9999-a1f3a22afa6d]: --------- Port  209.182.216.71:8176
<>   72.214.35.171:63577, SSRC 1234c6eb, 641 p, 110252 b, 0 e, 60 ts
Apr  9 20:02:43 centos-1024mb-nyc-02 rtpengine[58438]: INFO:
[66d2da58-21fe-48bd-9999-a1f3a22afa6d]: --------- Port  209.182.216.71:8177
<>   72.214.35.171:63056 (RTCP), SSRC 1234c6eb, 4 p, 372 b, 0 e, 60 ts
Apr  9 20:12:24 centos-1024mb-nyc-02 rtpengine[58438]: INFO: Version
git-master-3ef300b shutting down
Apr  9 20:12:37 centos-1024mb-nyc-02 rtpengine[58958]: INFO: Generating new
DTLS certificate
Apr  9 20:12:37 centos-1024mb-nyc-02 rtpengine[58959]: INFO: Startup
complete, version git-master-3ef300b
Apr  9 20:13:43 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08]: Received command 'offer' from
127.0.0.1:57645
Apr  9 20:13:43 centos-1024mb-nyc-02 rtpengine[58959]: NOTICE:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08]: Creating new call
Apr  9 20:13:43 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08]: offer time = 0.002612 sec
Apr  9 20:13:43 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08]: Replying to 'offer' from
127.0.0.1:57645
Apr  9 20:13:56 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08]: Received command 'answer' from
127.0.0.1:42309
Apr  9 20:13:56 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08]: answer time = 0.000220 sec
Apr  9 20:13:56 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08]: Replying to 'answer' from
127.0.0.1:42309
Apr  9 20:13:56 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8000]: DTLS: Peer certificate
accepted
Apr  9 20:13:56 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8000]: DTLS-SRTP successfully
negotiated
Apr  9 20:13:57 centos-1024mb-nyc-02 rtpengine[58959]: ERR:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8000]: SRTP output wanted, but
no crypto suite was negotiated
Apr  9 20:14:00 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8000]: Confirmed peer address
as 72.214.35.171:58634
Apr  9 20:14:07 centos-1024mb-nyc-02 rtpengine[58959]: ERR:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8001]: SRTCP output wanted, but
no crypto suite was negotiated
Apr  9 20:14:07 centos-1024mb-nyc-02 rtpengine[58959]:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08] version=2, padding=0, count=1,
payloadtype=200, length=12, ssrc=2045607967, ntp_sec=1379282714,
ntp_fractions=439054259, rtp_ts=1838072137, sender_packets=3366262813,
sender_bytes=2383498210, ssrc=815258372, fraction_lost=96,
packet_loss=13713522, last_seq=3314313929, jitter=2878956247,
last_sr=2456273253, delay_since_last_sr=3351655681
Apr  9 20:14:07 centos-1024mb-nyc-02 rtpengine[58959]: INFO:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8001]: Confirmed peer address
as 72.214.35.171:57732
Apr  9 20:14:12 centos-1024mb-nyc-02 rtpengine[58959]: ERR:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8000]: SRTP output wanted, but
no crypto suite was negotiated
Apr  9 20:14:17 centos-1024mb-nyc-02 rtpengine[58959]:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08] version=2, padding=0, count=1,
payloadtype=200, length=12, ssrc=2045607967, ntp_sec=2811881700,
ntp_fractions=4080266212, rtp_ts=371429680, sender_packets=958830616,
sender_bytes=2579186043, ssrc=1909756377, fraction_lost=174,
packet_loss=11416637, last_seq=3106722675, jitter=758758394,
last_sr=2663618457, delay_since_last_sr=1399181077
Apr  9 20:14:27 centos-1024mb-nyc-02 rtpengine[58959]: ERR:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8000]: SRTP output wanted, but
no crypto suite was negotiated
Apr  9 20:14:27 centos-1024mb-nyc-02 rtpengine[58959]: ERR:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08 port  8001]: SRTCP output wanted, but
no crypto suite was negotiated
Apr  9 20:14:27 centos-1024mb-nyc-02 rtpengine[58959]:
[a5ca8335-84d2-4daf-a0e2-6465e72b6d08] version=2, padding=0, cou


It is how I have programmed it in my Kamailio configuration.

ON INVITE

rtpengine_offer("replace-origin replace-session-connection ICE=remove
UDP/TLS/RTP/SAVP");

ON 200-ok

rtpengine_answer("replace-origin replace-session-connection ICE=remove
UDP/TLS/RTP/SAVP");


Best Regards,

Aqs Younas
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