Configuring Kerio Operator and Grandstream HT503 for calls over analog lines

The Grandstream HT503 is an analog-to-SIPSession Initiation Protocol - A communication protocol used for voice and video calls in Internet telephony or private IP telephone systems. ATAAnalog telephone adapter - A device for connecting analog devices to a digital or voice over IP network. device with one FXO and one FXS port. You can use this device with Kerio Operator to make calls over the telephone network.

After you complete the configuration, make some test calls to verify the connection between Kerio Operator and Grandstream HT503.