The number mapping explained in this chapter describes the mapping of internal numbers for a user to external call numbers. Number mapping should not be confused with the number replacement which can be defined on a trunk group. Number replacement specifies how numbers (number ranges) can be replaced by other numbers/ranges (Defining call number substitutions for a trunk group).

In this context, please note the following definitions: Forwardings are in relation to a trunk group and establish whether a call via this trunk group can fundamentally leave the SwyxWare installation (Forwarding and number substitution). The call permission for a user or a trunk group defines whether a call has the right to be made via this trunk group (Edit trunk groups).