The invention relates to a gateway for connecting telecommunications
networks, and to an associated method, in which a user channel data
converter is connected via at least one additional user channel data
interface to a switching center, and a signaling channel data converter
is inserted between an already existing user/signaling channel data
interface such that signaling information (SD(cic4)) which is transmitted
on this data interface is filtered out for the additional user channel
data interface. This results in a connection for a packet-switching
telecommunications network without any major intervention in the network
structure of a line-switching telecommunications network.