##### Telephony service

Telephony 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:

- Free time is the time threshold (say, 5 sec.) for free calls. Longer calls are charged for based on the full time of the call.
- Starting period length is the length of initial period having special rounding step.
- Starting period step is the rounding step for the starting period.
- Next period step is the rounding step for the rest of the call.
- Tariffication unit size is the size of time unit to set the price for.
- Limit of simultaneous sessions sets the maximum number of concurrent connections that may be established with the same login.

- Discount free time flag, when checked, makes the system consider the prepaid time (see Prepaid values) in the cumulative summary duration of calls on which the call price per minute may depend.

- Price editor contains the list of call time prices defined separately for various time ranges and for various telephone zones and/or directions.

| To create a telephony service, at least one telephone zone or direction must exist in the system.

The prices may be updated all at once according to an arbitrary formula. For example, to mutiply the prices by 1.1, select the rows in question, enter the formula `x*1.1 + 0`, and press Enter.

- Tariffication borders contains the tariffication borders, which are the values of total duration of calls per accounting period defined separately for different telephone zones and/or directions and used to set variable call prices depending on the summary duration of calls within the accounting period.

| To set the tariffication borders for a particular telephone zone or direction, this zone or direction must be present in the price editor (see above) of this telephony service.

- Prepaid values contains the amounts of prepaid telephone traffic allocated separately for different telephone zones and/or directions.
- Fixed cost contains the fixed cost of a call defined separately for different telephone zones and/or directions. This cost is imposed on every call, regardless its duration, in addition to the variable part defined in Price editor and Tariffication borders.
- RADIUS parameters .

Parameters of the corresponding service link are described in Telephony service link.