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Cisco phones not registering with the SIP server after upgrade from Cyberoam to Sophos OS

David Ibegbu

Hello,

 

I have a Cyberoam firewall which i recently upgraded its firmware from Cyberoam firmware to Sophos firmware. After my upgrade, the Cisco phones couldn't register to the SIP server located at a remote location.

I have done every configurations and check all the rules, they seem Okay but the IP phones are not just connecting to the SIP server

Is there a particular port Cisco phones use to communicate with the SIP server which i have to allow? Or has anyone experienced this before?

 

Awaiting kind response.



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    Cisco phones need the TFTP server address for downloading the config files during boot. The address to the TFTP is provided by the DHCP server under option 150.  Make sure your DHCP server is delivering this to the phones. You may need to configure a helper address on the XG if the DHCP server is remote.

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    Cisco phones need the TFTP server address for downloading the config files during boot. The address to the TFTP is provided by the DHCP server under option 150.  Make sure your DHCP server is delivering this to the phones. You may need to configure a helper address on the XG if the DHCP server is remote.

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