Conference unit on PABX S-Bus

A real humdinger! Pretty simply, the conference unit had S-Bus ISDN lines from the PABX to the conference unit. The incoming PSTN line is a E1 (2Mb) line. The unit could establish outgoing calls to other units, but could not receive.

On testing the S-Bus lines and instigating a "loop" call on the port, the ISDN tester would have the call immediately released, "CAUSE 16". On replacing the BRI board and testing on another system, it beame clear that the fault was programming specific on the clients PABX, as the problem did not occur on other PABX's.

The resultant problem was that the S-Bus trunks belonged to the same Public Directory number group. Hence, any call sent to/from the port was prefixed with the client predigits. Placing all the S-Bus trunks in an unmodified - default - table, solved the problem.

See commands: [1030] per trunk, and [2220] on the BusinessPhone 250.

Ericsson BP Hotel

In setting up a recent site for a Hotel, using a Ericsson BP250, I discovered that the hotel phones were not barred during check in/out. The procedure completed successfully, but the extension remained open despite being checked - out. The setup of the PABX had the extensions setup as guest phones - no joy. In the end, the operator had been adjusted to 4777. By changing the operator to 9 I managed to get the call barring to work. Further experimenting proved that the operator (not the SWB!) had to be 9. Any other number and call barring with check in/out does not work.