In this example, call routing benefits from the unique internal telephone numbers.
- With in-coming calls, regardless of whether they are via ISDN or SIP,
only the DDI is passed on to the LANCOM VoIP Router. 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 can not, or should not, be used directly as internal numbers, corresponding telephone number translations are defined in the ISDN and SIP mapping tables, see and ..
- With out-going calls, the decision as to whether calls are made using ISDN or SIP may be controlled from the call routing table. 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.