Hi
I have a problem with DTLS-SRTP and I don't know where to search. I tested two
windows PCs with LinPhone 3.11.1 calling each other with DTLS active and the
call works fine. The key exchange is ok and in wireshark everything works fine.
Now I have an external device with OpenSSL 1.0.2 and PjProject 2.9. I try to
establish a call between the LinPhone and my external device. The LinPhone send
the invite and the external device sends the following "client hello" message
that could not be processed by the LinPhone. There is also no SRTP
communication between them. After a specific time the external device sends a
bye because of a RTP underrun. So my question is now if this is a problem in
LinPhone (Something is no supported) or if the external device sends an
incorrect message?!
Best regards
Harald
LinPhone Log:
warning: 2019-11-29 14:08:45:675 DTLS handhake returns -0x7900 : SSL -
Processing of the ClientHello handshake message failed [on sessions: 068BF930
rtp session 0691CB80]
Message from external device:
Datagram Transport Layer Security
SSL Record Layer: Handshake Protocol: Client Hello (Fragment)
Content Type: Handshake (22)
Version: DTLS 1.0 (0xfeff)
Epoch: 0
Sequence Number: 0
Length: 243
Handshake Protocol: Client Hello (Fragment)
Handshake Type: Client Hello (1)
Length: 298
Message Sequence: 0
Fragment Offset: 0
Fragment Length: 231
SSL Record Layer: Handshake Protocol: Client Hello (Reassembled)
Content Type: Handshake (22)
Version: DTLS 1.0 (0xfeff)
Epoch: 0
Sequence Number: 1
Length: 79
Handshake Protocol: Client Hello (Reassembled)
Handshake Type: Client Hello (1)
Length: 298
Message Sequence: 0
Fragment Offset: 231
Fragment Length: 67
Version: DTLS 1.2 (0xfefd)
Random: 8783c8649728b9363eb99fb19230e7c717be5bcc6abb68c8...
Session ID Length: 0
Cookie Length: 0
Cipher Suites Length: 160
Cipher Suites (80 suites)
Compression Methods Length: 1
Compression Methods (1 method)
Extensions Length: 96
Extension: ec_point_formats (len=4)
Extension: supported_groups (len=28)
Extension: SessionTicket TLS (len=0)
Extension: signature_algorithms (len=32)
Extension: heartbeat (len=1)
Extension: use_srtp (len=7)
[2 Message fragments (298 bytes): #77(231), #77(67)]
[Frame: 77, payload: 0-230 (231 bytes)]
[Frame: 77, payload: 231-297 (67 bytes)]
[Message fragment count: 2]
[Reassembled DTLS length: 298]
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