- An internal user B (SIP, ISDN or analog) calls an external user A (at a SIP PBX line).
- A makes an additional call to a local user C.
- The external user A then forwards the call to C.
- The R&S®NC VoIP router manages the call forwarding. If the connected subscribers B and C are internal users, the R&S®NC VoIP router only checks the SIP data for signaling and enables the RTP data transfer over the shortest direct path between the SIP users.
Note: Requires that the VoIP PBX fully supports Transfers in SIP (re-invites).
