One solution is to make sure that you configure the second port on the ATA.
This is beacuse the ATA attempts to download configuration for the second port and int he process resets the ATA, hence when a call is active it drops the call..
To configure the second line on the ATA is a bit tricky, here is what nneeds to be done...
.You need to add it as a new device and use the mac address obtained from the steps below:
Drop the first two nibbles of the MAC address and shift the MAC address to the left, then add 01 to the
right end of the MAC address. For example if the mac address of the ATA is 00070EA26032 and is already configured for port 1, then 070EA2603201 will be the mac address for port 2.
1. 00070EA26032..............drop the first 2 numbers/letters on the mac address
2. 070EA26032.................Shift to the left after step 1
3.070EA2603201...............add 01 to the end of result in step 2
Hence you will add a new ata device with the mac address of 070EA2603201. AFter configuring it, you can give it a dumy DN or leave it as it is. Just make sure that its configured and registered
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