[Users] March 17, 2020 Zeta Alliance Conference Call Summary

[Fabio S. Schmidt]

Hi, 

Thank you for keeping the community updated. 

About the "TURN Server Recommendation And Testing", we have deployed Zimbra Connect for several customers in Brazil and the only TURN server that supported the videos 

Atenciosamente, 
Fabio S. Schmidt 

Diretor técnico 

E-mail: fabio at bktech.com.br 
[ http://www.bktech.com.br/ | www.bktech.com.br ] 
Tel.: +55 (61) 3226-7932 

Cel.: +55 (61) 99116-3941 


De: "Randy Leiker" <randy at skywaynetworks.com> 
Para: "users" <users at lists.zetalliance.org> 
Enviadas: Terça-feira, 17 de março de 2020 18:16:28 
Assunto: [Users] March 17, 2020 Zeta Alliance Conference Call Summary 

Hello Zeta Alliance Community, 

Here is a summary of this week’s conference call. A few brief reminders: 


    * Conference calls are every Tuesday and open to all using either the FreeConferenceCall.com VoIP app or via a dial-in number: [ https://www.freeconferencecall.com/wall/zetalliance | https://www.freeconferencecall.com/wall/zetalliance ] 
    * Each week’s call agenda can be found at: [ https://docs.google.com/document/d/1uUUDJpwp2CAylU6lxtbEdVcUX_qSbciyes6gLTWw2fY/edit | https://docs.google.com/document/d/1uUUDJpwp2CAylU6lxtbEdVcUX_qSbciyes6gLTWw2fY/edit ] 
    * A copy of each week’s summary is also posted to the Zimbra Forum: 
        * January 2020: [ https://forums.zimbra.org/viewtopic.php?f=9&t=67572 | https://forums.zimbra.org/viewtopic.php?f=9&t=67572 ] 
        * February 2020: [ https://forums.zimbra.org/viewtopic.php?f=9&t=67726 | https://forums.zimbra.org/viewtopic.php?f=9&t=67726 ] 
        * March 2020: [ http://forums.zimbra.com/viewtopic.php?f=9&t=67855 | http://forums.zimbra.com/viewtopic.php?f=9&t=67855 ] 
    * Constructive feedback on these call summaries is always welcome. 

March 17, 2020 Conference Call Summary 

Zimbra Connect Maximums 
Randy L. asked about the maximum number of simultaneous call participants possible when using Zimbra Connect’s Instant Meetings feature (https://zimbra.github.io/adminguide/latest/#_instant_meetings). Cine said that while there is no known limit on the Zimbra server-side, testing has shown that most client-side web browsers struggle with maintaining more than 5 simultaneous video streams. For the best meeting performance, he suggested that only the presenter enable their video stream and optionally a screen share, while all other call participants switch off their video streams, for audio-only connections. 

Configuring TURN Servers For Zimbra Connect 
Randy L. asked about the benefits of adding multiple TURN servers to Zimbra Connect’s global configuration (https://zimbra.github.io/adminguide/latest/#_stunturn_server) for both redundancy and load sharing purposes. Cine said that there is no benefit in adding more than one TURN server, since Zimbra Connect is designed to only use a single TURN server, even if multiple TURN servers are defined in the global configuration. Randy asked if there would be a benefit in configuring Zimbra Connect to use a load balancer as its global configuration TURN server, with the load balancer then managing multiple back-end TURN servers. Cine said this should be possible, but that careful configuration and testing would be needed on the load balancer to properly handle web socket connections from client browsers since the load balancer and backend TURN servers are being used as a proxy for Instant Meeting participants. Mark S. also asked if it is necessary to add a TURN server in the global configuration to each individual class-of-service. Cine said this is not needed, as Zimbra Connect will first check for configured TURN servers at the account level, then class-of-service, then in the global configuration, just like inheritance of configuration values normally works for other Zimbra configuration settings. 

Mark S asked if a TURN server is required for Zimbra Connect, even if all Zimbra servers are configured with public IP addresses. Cine said that the best way to tell if a TURN server is needed is to test the Instant Meeting feature in Zimbra Connect to determine if video calls work. If not, then a TURN server is required. Similarly Mark S. asked if a TURN server is usually needed when two or more Instant Meeting participants are on the same logical network (such as a campus network). Cine said that this is usually not needed, since the two clients will often be able to establish a direct WebRTC connection to each other. Mark also asked if a restart of mailboxd is required when making a configuration change to Zimbra Connect, such as adding a TURN server. Cine said this is not necessary, although clients will likely need to either refresh their browser windows, or log out and log back in again for the setting change to take effect for each client’s Zimbra Connect session. Randy L. suggested that there were many good write-ups online about how STUN and TURN work. For example: https://bloggeek.me/google-free-turn-server/ . 

TURN Server Recommendation And Testing 
Cine suggested looking at using the STUN/TURN server available from: https://www.resiprocate.org/Main_Page as he has had good experiences with it at Zextras. 

For testing a TURN server and WebRTC, Cine suggested using both https://test.webrtc.org and from a Chrome web browser, the WebRTC debugging tool: chrome://webrtc-internals/ to ensure that a TURN server is properly configured. 

Zimbra Drive And Zimbra Connect 
Mark S. commented that sharing files via Zimbra Connect (https://zimbra.github.io/adminguide/latest/#_file_sharing) did not appear to work in all instances. Cine said that when sharing a file, it is uploaded to Zimbra Drive, so Drive is required for file sharing to work within Zimbra Connect. Cine also pointed out that file sharing is not yet available in all parts of Zimbra Connect, such as the Spaces and Channels features. 

Zextras App Support And Usage With Zimbra Drive 
Mark S. reported that he successfully used a Zextras developed app from the iOS app store with Zimbra Drive, even though there is no official Zimbra client-side app presently for use with Zimbra Drive, other than the Zimbra Web Client. Mark asked if Zimbra provides any support for this Zextras developed app. John H. said that Zimbra does not support the Zextras apps, but they should generally work, as they share the same code base, as is found in Zimbra Server. Mark also asked if the Zextras Team app (https://www.zextras.com/suite/team/) is the same as Zimbra Connect. Cine said that while Zextras Team does contain much of the same code base as Zimbra Connect, they are considered to be two separate products, and there is no official support from Zimbra for Zextras Team. 

Zimbra Connector for Outlook (ZCO) Update 
Following-up on the 8.8.15 Patch 8 discussion in last week’s call, Randy L. asked if the updated ZCO build is available yet that fixes the known Outlook issues discussed in the Patch 8 release notes. John H. said that he asked Zimbra Product Management to release the updated ZCO build containing the fixes as soon as possible, but they have opted to release the updated ZCO build as part of the Zimbra 9 General Available release that is scheduled to happen very soon. 


Randy Leiker ( randy at skywaynetworks.com ) 
Skyway Networks, LLC 

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