Alexander SHATSKY

System and method for managing registration of services for an electronic device

SYSTEM AND METHOD FOR INDICATING CALLEE PREFERENCES

“Push” keep-alive mechanism for SIP user agents located behind NATS/firewalls

System and method for detecting and processing stale messages

System and method for providing and managing a target list on behalf of a user agent client

Method, device and system for enhancing location information

System and method for managing registration of services for an electronic device

Method and system to release internet protocol (IP) multimedia subsystem (IMS), session initiation protocol (SIP), IP-connectivity access network (IP-CAN) and radio access network (RAN) networking resources when IP television (IPTV) session is paused

APPARATUS AND METHOD FOR REDUCING RESPONSES WHEN EXECUTING A SESSION INITIATION PROTOCOL OPERATION

System and method for alternating between in-band and out-of-band communication path

System and method for detecting and processing stale messages

System and method for managing registration of services for an electronic device

Systems and methods for facilitating push-to-talk (PTT) communications using SIP-based messaging

Apparatus and method for macro operation involving a plurality of session protocol transactions

System and method for handoff of session from VoIP interface to cellular interface of dual-mode device

Dual-mode device and method for handover of session from VOIP interface to cellular interface

Method and system for enforcing proxy use within an enterprise communications system

METHOD AND SYSTEM FOR DEREGISTERING OUT-OF-COVERAGE RANGE DEVICES IN A WIRELESS LOCAL AREA NETWORK