The ZRTP session between Linphone and Zoiper is not working

Question

Hello, 

I'm trying made a call with zrtp between Linphone and Zoiper, but the session ZRTP is not working. 

The Zopier complain during the negotiation phase with the follow error message: " Critical software error". 

A piece of Zoiper log file:

DumTimeout::Retransmit200: duration=500 seq=947755290

DEBUG | 20200218-103247.804 | ZRTP | -1734780624 | Session.cxx:1282 | Retransmitting Hello   

DEBUG | 20200218-103247.804 | ZRTP | -1734780624 | Session.cxx:280 | Send Packet 148 bytes

DEBUG | 20200218-103247.969 | ZRTP | -1703958224 | Session.cxx:220 | 20 bytes from network

DEBUG | 20200218-103247.969 | RESIP | -1703958224 | BaseException.cxx:21 | BaseException at /home/autobuilder/build-jniwrapper/jniwrapper-cmake/dep/library/zrtp/src/message/Packet.cxx:36 Packet preamble mismatch.

DEBUG | 20200218-103247.973 | ZRTP | -1703958224 | Session.cxx:252 | Message process failed with exception: Packet preamble mismatch.

DEBUG | 20200218-103247.976 | ZRTP | -1703958224 | Session.cxx:287 | Send Message Error   

DEBUG | 20200218-103247.977 | ZRTP | -1703958224 | Session.cxx:280 | Send Packet 32 bytes

DEBUG | 20200218-103247.977 | WRAPPER | -1703958224 | sip_call.cpp:1984 | ZRTP failed with local error, code: 32, text: Critical software error

DEBUG | 20200218-103247.977 | WRAPPER | -1703958224 | appl_event_queue.cpp:123 | Notify event [N3scx15CCallZrtpFailedE] callCreateSent= 1

DEBUG | 20200218-103247.977 | WRAPPER | -1703958224 | appl_event_queue.cpp:129 | Posting event

DEBUG | 20200218-103247.977 | WRAPPER | -1703958224 | appl_event_queue.cpp:106 | SetCallCreateSent, cur= 1

DEBUG | 20200218-103248.005 | ZRTP | -1734780624 | Session.cxx:1282 | Retransmitting Hello   

DEBUG | 20200218-103248.005 | ZRTP | -1734780624 | Session.cxx:280 | Send Packet 148 bytes

DEBUG | 20200218-103248.206 | ZRTP | -1734780624 | Session.cxx:1282 | Retransmitting Hello   

DEBUG | 20200218-103248.206 | ZRTP | -1734780624 | Session.cxx:280 | Send Packet 148 bytes

Comments

Hello,

Could you please use the contact form on our website and a cloud file sharing service to provide us with the complete debug-log ?

When you open the ticket through the contact form on our website, please mention that you have been asked in the community and provide URL to this thread. 

Thank you!

Answer 1

Hi,

Thank you for the log, I have removed your last comment with it since it contains some private information. 
It seems that we have also received other reports regarding this issue with Linphone. For some reason they do not send "HelloACK", so the ZRTP cannot be negotiated. 
As you can also see by your log, Zoiper tries to send multiple "Hello" packets and resends them for some time, but there is no appropriate response as per the RFC, thus the call negotiation fails.

Comments

I tried to make a call using "cloud softphone" and it did not work too.