The main feature of on the market available settlement systems is a using of sole standard form of airline tickets. In the TCH settlement systems (Transport Clearing House) is used also an electronic form of Standart Transport Documents for contract  of passengers and baggage transportations and related services. Passenger is provided with e-ticket (itinerary/receipt)" and additional information with transportation details and obligatory notification.

Session in  Sirena-Travel GDS  it’s a screen in the reservation system, which enables  agency operator to reserve a seat and automatic  TCH, BSP or airline E-ticket issuing. Agencies operators can booking  and  ticketing in Sirena-Travel GDS in various sessions. TCH session allows  operator of TCH accredited agency (or subagent of accredited agency) to proceed the sale of TCH tickets.

Technologically operating with Sirena-Travel GDS  means operator authorization before the  booking beginning  in any of the mentioned above sessions by  special request.  For example: 

W - Function designator
TCH – Owner ticket code 
99GRS – Agency code
0001 - Agent number     
TCH99GRS0001 - Agent identifier
1234ABCD - Agent password 

In signing the Agency Agreement, Sirena-Travel CJSC offers a range of terminals, from which the agent can choose technology addresses, and needs to send requests for description (registration) in the required session to the appropriate accrediting organization: TCH, BSP or Airlines.