You will need to modify the following file:
https://github.com/Telaxus/EPESI/blob/master/modules/CRM/PhoneCall/PhoneCallCommon_0.php
Line 104:
public static function check_contact_not_empty($v) {
$ret = array();
if ((isset($v['other_phone']) && $v['other_phone']) || (isset($v['other_customer']) && $v['other_customer'])) {
if (!isset($v['other_phone_number']) || !$v['other_phone_number'])
$ret['other_phone_number'] = __('Field required');
} else {
if (!isset($v['phone']) || !$v['phone'])
$ret['phone'] = __('Field required');
}
if (!isset($v['other_customer']) || !$v['other_customer']) {
if (!isset($v['customer']) || !$v['customer'])
$ret['customer'] = __('Field required');
} else {
if (!isset($v['other_customer_name']) || !$v['other_customer_name'])
$ret['other_customer_name'] = __('Field required');
}
return $ret;
}
You will need to add your newly created field.
Save this file as it will be overwritten during an upgrade and you will need to make the same modifications again.