Preserving stable calls during failover

Details Preserving stable calls during failover Preserving stable calls during failover

2008-11-14

2010-11-30

Ferris, Derrick W (Department: 2463)

Multiplex communications

Fault recovery

Reexamination Certificate

active

07843809

ABSTRACT:
According to one method for preserving stable calls during failover, during a dialog between two user endpoints, a determination is made whether a standby call processor has become operational, such as when a corresponding primary call processor is in fault. Responsive to determining that the standby call processor has become operational, a signaling protocol message is received from a requester. A determination is made whether the message includes an in-dialog signaling protocol request. Responsive to determining that the message includes the in-dialog request, a determination is made whether a call state associated with the dialog is found in memory. Responsive to determining that the call state associated with the dialog is not found in memory, a non-call terminating error response is made responding to the in-dialog request. The non-call terminating error response may cause the requester to terminate the in-dialog request but not terminate the dialog.

REFERENCES:
patent: 5848128 (1998-12-01), Frey
patent: 6885861 (2005-04-01), Koskelainen
patent: 2004/0184452 (2004-09-01), Huotari et al.
patent: 2008/0225835 (2008-09-01), Oda et al.

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