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From: | Schuster Harald |
Subject: | [Linphone-users] OpenSSL DTLS-SRTP Problem |
Date: | Fri, 29 Nov 2019 14:21:20 +0000 |
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 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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