We just signed up to use SIP phones instead of using the old PBX box. We received the phones the other day but upon plugging them in and adjusting settings in Kerio Conrol (Version 9.1.0) we cannot connect them to our Service Providers system to get them registered and working. Here are the settings that they said need to be adjusted:
"Firewalls are primarily designed to keep unauthorized trafﬁc from accessing your private network. In some cases the default ﬁrewall rules might cause Nextiva's trafﬁc to be blocked. The simplest way to avoid issues is to open up inbound and outbound trafﬁc to/from Nextiva's IP addresses.
• IP Addresses: 18.104.22.168/21 and 22.214.171.124/22. This range covers the IP addresses from 126.96.36.199 - 188.8.131.52 and 184.108.40.206 220.127.116.11.
• Ports: 5060-5090
• Transport Method: TCP & UDP
• Permission: Allow All Trafﬁc
When setting up ﬁrewall rules, please ensure you are creating a ﬁrewall rule to allow access through the entire Nextiva IP address range. All Nextiva servers are located in the following IP range:
CIDR: 18.104.22.168/21 & 22.214.171.124/22
Range: 126.96.36.199 - 188.8.131.52 and 184.108.40.206 220.127.116.11 Cisco Firewall Rules
To whitelist Nextiva's IP range in a Cisco command line device, the following rules must be set:
• access-list permit ip 18.104.22.168 0.0.7.255
• access-list permit ip 22.214.171.124 0.0.3.255"
What should my traffic rules look like to accomplish the above?
Also, is there anything else that would need to be adjusted?
1. Use "IP Address Group" to define the trusted Nextiva IP Address range(s)
2. Use "Services" to create a custom service for the required Nextiva TCP/UDP ports
3. Use 1 & 2 above to create a traffic rule that allows those IP's to reach your firewall on those ports
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