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Zoom Phone with SG125 (UTM 9)

Trying to configure ZOOM Phone services (via there Application) on UTM 9. Had Sophos techs open the ports and added all the IP addresses required by Zoom. For some reason this still doesn't work. Has anyone configured Zoom Phone service to work with Sophos SG125 (UTM 9)? Please help!

List of IP addresses:

8.5.128.0/24
64.211.144.0/24
103.122.166.0/23
109.94.160.0/22
120.29.148.0/24
147.124.96.0/19
162.12.232.0/22
192.204.12.0/22
207.226.132.0/24
209.9.211.0/24
209.9.215.0/24
213.19.144.0/24
213.19.153.0/24
213.244.140.0/24

Ports:
TCP - 5090:5091
UDP - 5090
UDP - 20000:64000

I have tried everything and cannot figure this out.

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0 Alexander Busch over 4 years ago

Requirements are listed under https://support.zoom.us/hc/de/articles/201362683-Einstellungen-der-Netzwerkfirewall-oder-des-Proxy-Servers-für-Zoom
I didn’t check if all IPs match, but seems so.

Do you find anything in the firewall or IPS log?

Best regards

Alex

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0 dirkkotte over 4 years ago in reply to Alexander Busch

If using web-proxy, you have to configure proxy-exceptins too. (* zoom.us)

Also the listed IP#s should be excluded from SSL-Scan, AV, ...

Dirk

Systema Gesellschaft für angewandte Datentechnik mbH // Sophos Platinum Partner
Sophos Solution Partner since 2003
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0 Seth Bois over 4 years ago in reply to dirkkotte

I have tried everything as suggested. Sophos Tech's opened our appliance wide open and still was not able to use Zoom's Phone service. I'm beginning to think that there is something going on within the Sophos appliance that is not software controlled or can be accessed in any normal convention. I know it's not the ISP cause I connected directly to it via a laptop. I also know it's nothing on the network cause I connected directly to the back of the Sophos appliance. Maybe just time for some updated equipment. Who knows.
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0 Desert Larva over 4 years ago in reply to Seth Bois

[deleted]
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0 Jay Jay over 4 years ago in reply to Desert Larva
Recently started using zoom meeting here. It would not connect unless the following were exempted. Maybe zoom phone is using these also?

Had to add the following to the http proxy exceptions to allow it to connect.

^https?://([A-Za-z0-9.-]*\.)?zoom\.us

^https?://([A-Za-z0-9.-]*\.)?zoomsvr\.us
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0 Seth Bois over 4 years ago in reply to Jay Jay

Just replying back for those who might run into this problem.

So after spending countless hours and days trying to figure out why Zoom phone would not work. It came down to a simple setting.

Set the MTU setting to 1500 (From 1440) on both Internal and External Networks.

It all works now. No other settings required.

It just works!
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