| Remote site dials | Call router receives | Assigned via | Number in use | Correct call route | Destination line | |
|---|---|---|---|---|---|---|
| 1 | 0 123 456 789 | 456 789 | internal destination number for SIP line | 11 | None | ISDN |
| 2 | 0 123 555 555 1 | ISDN PBX | 11 | Internal | ||
| 3 | 0 123 555 555 4 | 14 |
|
14 | None | Internal |
- The incoming call for the SIP line number is directed to the Call Router along with the internal destination number that has been configured. The Call Router cannot find a matching entry in the call routing table, but it can find a registered user with the matching internal number. Since the user is an ISDN user, the Call Router directs the call to the ISDN line. The PBX receives the number 11 and can determine this call to be an internal call for the connected ISDN telephone.
- The incoming calls to the MSNs for the connected ISDN terminal equipment can be assigned directly by the PBX itself, the Call Router is not involved here.
- The PBX directs incoming calls to the MSNs for the connected VoIP terminal equipment to the internal ISDN bus with the internal MSN. The Call Router receives these calls as if they were internal calls and forwards them to the appropriate user since no corresponding entry can be found in the call routing table here either.
