R&S®NC VoIP routers support various services which are familiar to users of the ISDN network:
- With call hold the user can place an active call into a wait state. In this state the user can make a call to another person, for example.
- With swap call, the user can switch to and fro between two connections. The user is only connected with one caller at a time, while the other caller is put on hold.
- With transfer call the user switches an active call over to another call which is on hold. The two callers are then connected and the user is no longer involved in the call.
The services call hold, swap call and transfer call are available to all local SIP, ISDN and analog users, and also to subscribers at an upstream SIP PBX; however, they can only be initiated by a SIP user.
