| User | dials | Call router receives | Call router sends | Assigned via | Source line | Destination line | |
|---|---|---|---|---|---|---|---|
| ISDN network D | 089-12345-831 | 831 | 831 |
|
GW.HQ | Internal | |
| ISDN network A | 666-1 | 1 | 831 |
|
ISDN | GW.HQ | |
| ISDN network A | 666-9 | 9 | 555 |
|
ISDN | GW.HQ | |
| SIP exchange | 0043-662-33333 | 0043-662-33333 | 0662-33333 |
|
GW.HQ | ISDN |
- Call from customer in Hamburg to staff in Vienna. The customer dials the number of the Munich headquarters using the correct extension '089-12345-831'. Because the ISDN user is registered with the internal telephone number, the PBX at the headquarters receives only the DDI '831' and passed it on via the SIP PBX line. The LANCOM VoIP Router receives '831', locates a matching entry in the list of locally registered users and is able to connect the call.
- Call from customer in Vienna to the branch office in Vienna. The
customer dials the number of the branch office in Vienna using the correct
extension '666-1'.
- The LANCOM VoIP Router receives the DDI '1' and is not able to locate a matching entry in the list of locally registered users. Using the call-routing table, the telephone number is changed to '831' and forwarded on to the PBX in Munich via the SIP gateway connection. The PBX recognizes the registered ISDN user with the internal telephone number '831' and passes the call back to the LANCOM VoIP Router via the SIP PBX line.
- The LANCOM VoIP Router then receives '831', locates a matching entry in the list of locally registered users and is able to connect the call.
- Call from customer in Salzburg to the support number in Vienna. The customer dials the number of the branch office in Vienna using the correct extension '666-9'. The call is automatically put through to the internal support number '555' using the call routing table.
- Call from employee in Munich to customer in Salzburg. The employee dials '0043-662-33333'. The PBX in Munich is configured such that all calls to Austria are forwarded via the SIP gateway connection to the LANCOM VoIP Router. The call router receives the complete number, drops the country code as per the routing table having source line 'GW.HQ' and forwards the remaining number to the ISDN line.
Note: Here the call number from Munich is displayed at the remote site.