To complete the configuration, you need:

• Kerio Operator up and running.
• At least one internal extension.
• The Grandstream gateway connected to your LAN.
• One analog phone connected to the first port of the GXW gateway.

In the example below:

• The Kerio Operator IP address is 10.1.2.95.
• The Grandstream gateway's IP address is 10.1.2.200.
• The phone number of connected phone is 1234567.
• The internal extension's number is 100.

1. In the administration interface, go to Configuration > Call Routing > Interfaces and routing of incoming calls.
2. Click Add SIP Interface.
3. Type a name for the interface (for example, the provider's name). The name must not contain spaces or special characters and must be unique.
4. Select New provider.
5. In the With external number field, type the number 1234567 and click Next.
6. Select an extension that receives all calls, For example, (100.
7. Optionally, in the Prefix to dial out field, type a prefixCountry codes, area codes, a number, or a set of numbers that are dialed before the telephone numbers. for outgoing calls and click Next.
8. In the Domain (IP address/hostname) field, type the IP address of the Grandstream GXW gateway, 10.1.2.200.
9. Deselect the Required to register option and click Next.

10. Verify the information in the Summary section and click Finish.

To configure the GXW 4104 model, use the ch1-4 parameter. For a GXW 4108 model configuration, use the parameterch1-8.

1. In the Grandstream GXW administration interface, go to Accounts > Account 1 > General Settings.
2. In the SIP Server field, type the IP address of (10.1.2.95).
3. In the Account Active field, select Yes.
4. Optionally, set up your Account Name and Outbound Proxy.
5. Save your settings.

The web interface now asks whether you want to reboot to apply the new configuration. You can reboot now or continue with the configuration and reboot later.

1. Go to Accounts > User Account and verify that the configuration form is empty.
2. Go to Settings > Channel Settings > Calling to VoIPVoice over Internet protocol - A digital telephone system that uses the internet as the transmission medium, rather than the PSTN..

1. Set User ID to ch1-4:1234567;. Calls that come to any of the four analog ports are send to Kerio Operator as if the number called was 1234567. To differentiate among the analog ports, type additional external numbers (for example, 1234568) in the SIP interfaceAn external interface used for connecting to SIP providers. in Kerio Operator and set User ID to ch1-2:1234567;ch3-4:1234568. This configuration maps analog ports 1 and 2 to the number 1234567 and ports 3 and 4 to the number 1234568.
2. In the SIP Server field, set ch1-4:pl;.
3. In the SIP Destination Port field, set ch1-4:5060;.

3. Go to FXO Lines > Settings > Port Caller IDA service that provides information about caller's number. Setting.

1. In the Number of Rings Before Pickup field, set ch1-4:2;. Analog lines usually transmit the caller ID between the first and second ring. If you want to detect the caller ID, you must allow at least two rings before accepting the call.
2. In the Caller ID Scheme field, set the option to the method used by your analog line provider. For example, for Bellcore use ch1-4:1;.
3. In the Caller ID Transport Type field, set ch1-4:1; to transmit the caller ID in the SIP From field.

4. Go to FXO Lines > Dialing > Dialing to PSTNPublic switched telephone network - A global telecommunications network that operates the traditional telephony system., and in the Stage Method (1/2) field, set ch1-4:1;.
5. Reboot the gateway.

After the reboot, make several test calls to verify the configuration.