System and a method within private telecommunication

A method for transfer of information between a first and a second switching arrangement in a private telecommunications system using an asymmetric protocol allowing a higher transmission capacity in one direction than in the other and supporting set up of virtual calls,

• characterized in
• that it comprises the steps of:
• creating a call reference for a first virtual call in the first switching arrangement,
• storing the call reference in the first switching arrangement,
• sending the call reference to the second switching arrangement with a message initiating the first virtual call,
• storing the call reference in the second switching arrangement, and
• initiating a release of the first virtual call from the second switching arrangement,
• keeping only the internal connections relating to the virtual call in the first and second switching arrangements,
• initiating a second virtual call in the direction opposite to that of the first virtual call using the call reference of the first virtual call, and
• initiating information transfer from the second to the first switching arrangements using one or more messages.

A method for transfer of information between a first and a second switching arrangement in a private telecommunications system using an asymmetric protocol allowing a higher transmission capacity in one direction than in the other, opposite direction, and supporting set up of virtual calls,

• characterized in
• that it comprises the steps of:
• setting up a first virtual call between the first and the second switching arrangement,
• releasing the first virtual call,
• using a call reference common with a call reference created of the first virtual call for setting up a second virtual call in the direction opposite to that of the first virtual call between the second and first switching arrangement,
• using the second virtual call for transfer of information from the second to the first switching arrangement, such that symmetric transfer of information is enabled between the first and the second switching arrangement.