Patent ID: 8321592

Claim:
A method for generating and using statelessly reversible representations of session initiation protocol (SIP) information by SIP cluster entities, the method comprising: at a first SIP cluster entity including one or more processors, wherein the first SIP cluster entity comprises at least one of: a session border controller (SBC), a SIP proxy, and a back-to-back user agent: receiving a first SIP message including SIP information, wherein the SIP information comprises information stored in one of a via header field, a record route header field, a call id field, a path field, a service route header field, a to field, a from field, a referred to field, and a referred by field of the first SIP message; generating, in response to the first SIP message, a second SIP message including a statelessly reversible representation of the SIP information, wherein the statelessly reversible representation of the SIP information includes a representation that is algorithmically reversible by a second SIP cluster entity without storing state information for a SIP context to which the first SIP message belongs; and transmitting, to a SIP entity that is not a member of the cluster to which the first SIP cluster entity belongs, the second SIP message with the statelessly reversible representation and information for reaching the cluster.