Patent ID: 11956287
Assignee: UNIFY PATENTE GMBH & CO. KG
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 12:
13. A communication apparatus comprising:
a master node communicatively connectable to one or more backup nodes and/or a surveillance unit;
the master node configured to send a heartbeat and/or Address Resolution Protocol (ARP) ping to the one or more backup nodes and/or a surveillance unit according to preconfigured switchover timer values to verify that the master node is still active;
the one or more backup node and/or the surveillance unit configured to send an additional first Session Initiation Protocol (SIP) OPTION message to the master node after receiving the heartbeat and/or the ARP ping or if the heartbeat and/or the ARP ping fails to be received according to the switchover timer values;
the communication apparatus configured to perform a switchover or failover to a backup node in case the first SIP OPTION message is not answered with “200ok” by the master node according to a preconfigured time value; and
wherein the master node is also configured to recalibrate and increase the switchover timer values by sending a second SIP OPTION message comprising a new header indicating the altered switchover timer values, in case the heartbeat and/or the ARP ping fails, and the first SIP OPTION message has been answered with “200ok” by the master node in the preconfigured time value.