Guys,
the good people from pjsip support pointed me in the right direction: the offerer wasn't initiating the DTLS-SRTP handshake.
The reason was that the RTPEngine needed to be configured with a DTLS role of 'active', which was 'passive' before.
Hope this helps others.
Cheers,
Chris
On Tue, Apr 10, 2018 at 5:08 PM, Christian Scheid <cscheid@xxxxxxxxxxx> wrote:
Guys,we are currently trying to get DTLS-SRTP working with two Android clients and a Kamailio/RTPEngine server. It's been a bit rough, to say the least. So I could use some help. I also pledge to buy anyone who can assist a six pack of beer. I'll Paypal it to you. :)So what's happening? In short: nothing. No sound. Which is what I'm desperately craving for!The DTLS handshake completes fine between the two parties but when it comes to transmitting srtp, the sender gives me:Error sending RTP: Invalid operatiion (PJ_EINVALIDOP)In the receiver logs with DTLS_DEBUG turned on I see:DTLS-SRTP ssl_on_recv_packetdtls0x7bcd47568000 SSL_read() error: Unknown OpenSSL error 0dtls0x7bcd47568000 SSL_get_error: 5: Unknown OpenSSL error 0dtls0x7bcd47568000 DTLS-SRTP ssl_flush_wbiostrm0x7bcd3b927c28 !Error sending RTP: Invalid operation (PJ_EINVALIDOP)dtls0x7bcd47568000 !DTLS-SRTP receiving 1045 bytesSSL_get_error 5 means: SSL_ERROR_SYSCALL. Some non-recoverable I/O error occurred.Uhhhh, ugly!In the Wireshark output I see UDP packets from the receiver but nothing from the sender. Hmm. Perhaps a RTPEngine config issue?So I uploaded sender, receiver and wireshark logs here:If anyone could give me a hint on where to go from here, I'd be eternally grateful, Since... I've... banged... my... head... against... the... walll. with this one... a lot.You wanna ask a stupid question? Don't be shy, go ask a stupid question. I'm a pj beginner. Any stupid quest may put me on the right track.Thanks!Chris
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