Nokia Corporation

Nokia Networks Oy

Timo Juntunen

Toivo Lallukka

Olli Liinamaa

Pekka Lehto

Arto Rukaj&auml;rvi

Jyrki Suutari

Vesa Heikkila

Mika Haapea

Leena Antila

Tiina Lehikoinen

The invention relates to a method and system for ensuring a PSTN protocol restart procedure as defined by the V5 standard after a failure of a first data link carrying PSTN protocol signalling messages. In the method, a first time-out (TC ) for starting the restart process is observed and, if the time-out has tripped, the restart procedure is started by sending a start message using a Control protocol signalling message consistent with the V5 standard. According to the invention, after the first data link carrying the PSTN protocol has been restored to working order, a check is carried out to establish whether a second data link intended to carry Control protocol signalling messages is in order, and this check is repeated until the second data link intended to carry Control protocol signalling messages is in order, and when the second data link is in order, a message for starting the PSTN protocol restart procedure is sent in the Control protocol.

Method and system for ensuring a PSTN protocol restart procedure as defined by the V5 standard

The invention relates to a system and a method for implementing ISDN user port status monitoring in a network element transmitting messages in a cascaded V5 interface. In an embodiment of the invention, ISDN user port activation messages are transmitted unaltered through the message transmitting network element when the current state of the ports is other than the BLOCKED state consistent with the V5 definitions.

Method for implementing ISDN user port status monitoring

The invention relates to a procedure for the processing of an unexpected disconnect request in an access node (AN) which is connected to a local exchange (LE) over a V5 interface. In the access node (AN), call setdown is effected by means of a disconnect message, which is sent from the local exchange (LE) and on the basis of which the call resources in the local exchange (LE) are released. According to the invention, the resources reserved in the access node (AN) for the call are preserved. Moreover, the local exchange (LE) is informed that the subscriber is busy, thus preventing the occurrence of an undefined condition between the local exchange (LE) and the access node (AN).

Procedure for the processing of an unexpected disconnect request

Procedure for accomplishing PSTN-mapping in a telecommunication system comprising a telephone exchange (LE) with a number of subscribers defined in it, a first access node (AN,), which is connected to the telephone exchange via a first V5 interface (V5), a second access node (AN,), which is connected to the first access node (AN,) via a second V5 interface (V5&prime;), and terminal equipment (TE) connected to the second access node (AN,), the connection between the subscriber and the telephone exchange (LE) being set up by cascading the two V5 interfaces. The signalling sequences and message decoding in PSTN-mapping are exclusively taken care of by the telephone exchange (LE) and the second access node (AN,), and the signalling is transmitted transparently through the first access node (AN,) without the first access node participating in the decoding of the signalling.

Procedure for providing a pstm-mapping in a telecommunication system

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Oulu, Finland

Timo Juntunen