10.1.6.1. Feature Description 
“Signaling and Payload Separation” which enables OpenScape 4000
in an IPDA environment to split the path of the network traffic in the
meaning of
- signaling from host system (call control) to the access point is routed over the IP customer network (Enterprise WAN).
- payload is routed over the PSTN Network using payload survivability connections.
Signaling and payload separation is based on the existing survivability
solution and therefore the signaling path is routed in the same way as
in earlier OpenScape 4000 versions. The payload (RTP-Stream) is routed
across connections built up from WAML or ISDN-Router via PSTN-Lines between
the locations.