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Configuring NAT

Kerio Operator is behind NAT and phones are in the Internet

  1. In the administration interface, open section Network → General.

  2. In the NAT support section, enable NAT by checking the option.

  3. Enter the public address which should be used in SIP protocol messages.

  4. For phones in the same private network as Kerio Operator, create an appropriate IP address group in section Configuration → Definitions → IP Address Groups with all addresses on which phones communicate in your private network. Thus, the PBX will communicate with phones within the network directly.

  5. (Optional) You can also limit the RTP port range.

    Each call requires 4 ports for communication.

  6. Also, map the following ports from firewall to Kerio Operator:

    • TCP+UDP/5060

    • TCP/5061

    • UDP/443

    • TCP+UDP/3478

    • TCP+UDP/3479

    It is usually necessary to map a port range for RTP (according to the specified interval).

Kerio Operator is behind NAT and hardware phones are in the
		  Internet

Kerio Operator is behind NAT and hardware phones are in the Internet

Kerio Operator is in the company network and hardware phones are behind NAT

Firstly, configure NAT for Kerio Operator.

The scenario in figure requires only one minor configuration in the PBX settings:

  1. In the administration interface, open the Extensions section.

  2. Select the extension of the user whose phone is in a private network.

  3. In the Edit extension dialog, go to tab Advanced.

  4. Check the Extension is behind NAT option.

Kerio Operator is in the company network and hardware phones are
		  behind NAT

Kerio Operator is in the company network and hardware phones are behind NAT

Kerio Operator is behind NAT and hardware phones are in the Internet

Firstly, configure NAT for Kerio Operator.

If the telephone is in the Internet (not behind NAT), Kerio Operator does not require special configuration.

Phones which are in the Internet cannot be managed in section Provisioned Phones.


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