In this example, call routing benefits from the unique internal telephone numbers.
- For incoming calls, the only information passed to the LANCOM VoIP router is the DDI. Since the DDI and internal numbers are the same in this example, an extension number can be used to put through calls to locally registered SIP users or to dynamic ISDN users. Note: If the reported DDIs cannot or should not be used directly as internal numbers, the ISDN and SIP mapping tables are used to set up the necessary telephone number translations.
- In the default setting after using the Wizards, SIP is taken to be the normal destination line (with the exception of local calls and special numbers). Local calls, for example, may be switched to SIP by changing an entry in the call routing table.
Note: In this case, the SIP number is displayed at the subscribers on the other side of the connection, even if the call originates from an ISDN terminal device.
