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Re: [Linphone-developers] ZRTP Linphone<->CSipSimple

From: Sami Farin
Subject: Re: [Linphone-developers] ZRTP Linphone<->CSipSimple
Date: Wed, 6 Mar 2013 20:06:53 +0200
User-agent: Mutt/1.5.21+146 (302044b4ed3f) (2012-12-30)

On Wed, Mar 06, 2013 at 18:15:01 +0100, Werner Dittmann wrote:
> Some remarks from my side:
> I assume this log is from Linphone.
> the connection seems to be slow because quite some retransmits of packets.
> According to the info both clients had a ZRTP connection some time before
> (RS match found).

ZRTP retransmission scheme is aggressive.
>From rfc6189:
A Hello message is retransmitted 20 times before giving up, which means the 
entire retry
schedule for Hello messages is exhausted after 3.75 seconds (50 + 100 + 18*200 
Retransmission of a Hello ends upon receipt of a HelloACK or Commit message.

I saw two transmits before it gave up on ZRTP or something else happened,
hard to say, ten layers of complexity :)

> On the second part (CSipSimple to Linphone):
> what does "***no more ZRTP chatting!*** mean? Not more data exchange over the 
> connection between the two clients? Or only no more ZRTP packets? Audio 
> packets?

In the logs there no more "ZRTP" words.  I don't know if there ZRTP packets,
though :)

After that the connection worked OK without ZRTP enabled (CSipSimple said in
log "Crypto-suite: (null)".  Both of them decided not to warn user.

Do what you love because life is too short for anything else.

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