Under system admin>Port management is http provisioning set to port 84 and https to 1443? Are these phones remote to the pbx? If they are, make sure you add the ip address your phones are coming from to the firewall. Make sure the firmware on the phones are up to date. https://sangomakb.atlassian.net/wiki/spaces/DASD/pages/28311785/Sangoma+S-Series+Phone+Firmware
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