##### IP traffic service

IP traffic service properties window contains the following pages:

- Main (standard, see above).
- Service parameters is similar to the same page in Periodic service. In addition, contains the following elements:

- Traffic aggregation interval is similar in meaning to the global interface parameter called `traffic_agregation_interval` , only limited to this service alone.

- Limit of simultaneous sessions is the limiting number of simultaneous sessions. It is only set when the service is created and it can’t be changed later.
- Reset prepaid traffic is the flag of resetting the prepaid traffic at the end of the accounting period. If set, the unused prepaid traffic is cast to zero, otherwise it is transferred to the next period.
- Dynamic IP address allocation is used to link this service to another one of hotspot or dialup type (also having this flag set) in order to perform combined tariffication based together on connection time and traffic consumption. One account may have only one IP traffic service with this flag set.

- Tariffication borders contains the tariffication borders, which are the traffic volume values defined for different traffic classes separately and used to set variable traffic prices per megabyte depending on the amount consumed within the accounting period. Each border specification consists of the following values:

- Traffic class (or a group of classes, see below);
- Traffic volume;
- Price.

There is a default (hidden) border at traffic volume 0 having price 0.

- RADIUS parameters .
- Groups contains the interface of group tariffication. Group is a union of several traffic classes. The use of groups alters the very logic of tariffication in a following way. Each group is characterized by type, which may be either `max` or `sum`. A group of type `max` is tariffed by the prevailing class, i. e. the price for the whole group is determined via tariffication borders based on the amount of traffic for the class with maximum traffic. A group of type `sum` is tariffed by the price determined according to the summary amount of traffic for all classes.

| Groups must be created ahead of the tariffication borders. Once the custom borders are defined, the group creation interface is disabled.

- Prepaid traffic contains the list of prepaid traffic amounts for each of the traffic classes. The prepaid traffic is expended first of all and tariffed by zero price. At the end of the accounting period the unused prepaid traffic is transferred to the following period. The Accumulate no more than parameter, if set to a non-zero value, limits the amount of unused traffic that may be transferred so, regardless of its origin. If the parameter is set to 0, accumulation of prepaid traffic is not limited.

| Prepaid traffic and group tariffication are mutually exclusive options, i.e. their simultaneous use is impossible.

Parameters of the corresponding service link are described in IP traffic service link.