Patent ID: 9660885
Date: 2017-05-23
CPC Classifications: H04L

Claim:
1. A method of obtaining availability status at a requesting SIP cluster comprising a set of SIP nodes in respect of a plurality of user identifiers, the method comprising: for the user identifiers of the plurality of user identifiers that are not associated with a SIP cluster identifier of the requesting SIP cluster, sending, from the requesting SIP cluster to a user cluster information database, a request for a set of respective SIP cluster identifiers associated with the user identifiers that are not associated with the SIP cluster identifier of the requesting SIP cluster; receiving, at the requesting SIP cluster and from the user cluster information database, the set of respective SIP cluster identifiers associated with the user identifiers that are not associated with the SIP cluster identifier of the requesting SIP cluster; for each one SIP cluster identifier of the set of respective SIP cluster identifiers: