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_packet dtls0x7bcd47568000 SSL_read() error: Unknown OpenSSL error 0 dtls0x7bcd47568000 SSL_get_error: 5: Unknown OpenSSL error 0 dtls0x7bcd47568000 DTLS-SRTP ssl_flush_wbio strm0x7bcd3b927c28 !Error sending RTP: Invalid operation (PJ_EINVALIDOP) dtls0x7bcd47568000 !DTLS-SRTP receiving 1045 bytes SSL_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: https://www.dropbox.com/s/bwigoqa54ih1blx/Export.zip?dl=0 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

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@appguard.us> 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_packet > dtls0x7bcd47568000 SSL_read() error: Unknown OpenSSL error 0 > dtls0x7bcd47568000 SSL_get_error: 5: Unknown OpenSSL error 0 > dtls0x7bcd47568000 DTLS-SRTP ssl_flush_wbio > strm0x7bcd3b927c28 !Error sending RTP: Invalid operation (PJ_EINVALIDOP) > dtls0x7bcd47568000 !DTLS-SRTP receiving 1045 bytes > > SSL_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: > https://www.dropbox.com/s/bwigoqa54ih1blx/Export.zip?dl=0 > > 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 > > >

Unsubscribe for God sake. On Wed, Apr 11, 2018 at 8:16 PM, Christian Scheid <cscheid@appguard.us> wrote: > 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@appguard.us> > 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_packet >> dtls0x7bcd47568000 SSL_read() error: Unknown OpenSSL error 0 >> dtls0x7bcd47568000 SSL_get_error: 5: Unknown OpenSSL error 0 >> dtls0x7bcd47568000 DTLS-SRTP ssl_flush_wbio >> strm0x7bcd3b927c28 !Error sending RTP: Invalid operation (PJ_EINVALIDOP) >> dtls0x7bcd47568000 !DTLS-SRTP receiving 1045 bytes >> >> SSL_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: >> https://www.dropbox.com/s/bwigoqa54ih1blx/Export.zip?dl=0 >> >> 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 >> >> >> > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip@lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > >