You can use the Limit Number of Concurrent Calls (LNCC) feature on a multiappearance station to restrict the number of incoming calls to one call at a time. If you enable the LNCC feature and the station user is busy, the subsequent incoming calls receive a busy tone.
With Communication Manager Release 6.3 or later, you can enable LNCC on 96x1 SIP stations.
A typical Communication Manager station has three call appearances. The first two call appearances are used for receiving calls, and the last call appearance is reserved for making calls or receiving priority calls, provided the Restrict Last Appearance is set to y.
However, LNCC allows:
Outgoing calls, incoming priority calls, and emergency callback for SIP stations.
Outgoing calls, incoming priority calls, emergency callback, and crisis alert for H.323 and DCP stations.
