Restarting a B-Channel
                                            You can restart a specific B-channel belonging to an ISDN or CAS trunk, using the SNMP MIB variable, acTrunkISDNCommonRestartBChannel. This may be useful, for example, for troubleshooting specific voice channels.
                                            
                                                
                                                    
                                                    
                                                    
                                                    
                                                        |  | ● | If a voice call is currently in progress on the B-channel, it is disconnected when the B-channel is restarted. | 
                                                
                                                
                                                    
                                                    
                                                    
                                                    
                                                        |  | ● | B-channel restart can only be done if the D-channel of the trunk to which it belongs is synchronized (Layer 2). | 
                                                
                                                
                                                    
                                                    
                                                    
                                                    
                                                        |  | ● | B-channel restart doesn't affect the B-channel's configuration. |