The present invention provides a technique for providing a forced hold service such as is used for an emergency services call, which is supported at least in part over a packet network. The forced hold service acts to effectively hold a connection for the call with a called party, even when the caller...http://www.google.es/patents/US7587031?utm_source=gb-gplus-sharePatente US7587031 - Forced hold call handling in a VoP environment
