The present invention provides a method for signaling between an IP Multimedia Subsystem (IMS) and a multi-mode terminal using concise primitives to support the use of IMS-based services while the multi-mode terminal is attached to either the packet switched (PS) domain or to the circuit switched (CS)...http://www.google.fr/patents/US20080056236?utm_source=gb-gplus-shareBrevet US20080056236 - Unified IMS supplementary services signaling across circuit and packet domains
Unified IMS supplementary services signaling across circuit and packet domains
