Method and apparatus for interworking sip communication waiting with circuit switching and packet switching nodes

Abstract

A method and apparatus for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the method comprising receiving at the MSC an invite message and the MSC sending a setup message comprising an information element indicating a call waiting tone on when the invite message comprises a call waiting indication.

1 . A method for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the method comprising:
 receiving at the MSC an invite message; and   the MSC sending a setup message comprising an information element indicating a call-waiting-tone-on when the invite message comprises a call waiting indication.   
   
   
       2 . The method of  claim 1 , further comprising:
 the MSC storing an indication that the session includes a call waiting application server when the invite message comprises the call waiting indication.   
   
   
       3 . The method of  claim 2 , further comprising:
 if said indication that the session includes a call waiting application server is stored, receiving a response indicating that the UE does not support the communication waiting service to a UE that initiated said invite message and, where said UE involved in a first call does not support the communication waiting service, transmitting an unsupported media type response.   
   
   
       4 . The method of  claim 2 , further comprising
 if a timer expires:   (i) receiving a response, the response indicating # 19  (user alerting, no answer) or # 18  (no user responding), mapping the response to the  408  (Request Timeout) final response including a Reason header field with a protocol set to “Q.850” and a cause set to “ 19 ” or “ 18 ”, respectively; or   (ii) clearing the call and sending a response to the INVITE message.   
   
   
       5 . The method of  claim 3 , where said response to the INVITE message is a final response prior to expiry of any timers associated with service logic in at least one of a Communication Waiting (CW) and a Communication Diversion (CDIV) application server. 
   
   
       6 . The method of  claim 1 , further comprising
 receiving a request with a Reason header field with the protocol set to “SIP” and the cause set to “ 408 ”; and   sending the first clearing message with the Cause information element set to cause # 102  “recovery on timer expiry”.   
   
   
       7 . A method for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the method comprising:
 receiving at the MSC an invite message;   the MSC sending a setup message;   receiving a response message at the MSC; and   when the response message comprises a call waiting indication, the MSC sending an alerting message comprising a carrier message for the Call Waiting notification.   
   
   
       8 . A method for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the method comprising:
 sending at the MSC an invite message;   receiving a response message at the MSC; and   when the response message comprises a call waiting indication, the MSC sending an alerting message comprising a carrier message for the Call Waiting notification.   
   
   
       9 . A method for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the method comprising:
 receiving at the MSC an invite message; and   the MSC generating a SIP  415  ((Unsupported Media Type) response when the Communication Waiting or call waiting service is at least one of not supported, not allowed, and not subscribed to.   
   
   
       10 . A method for facilitating a supplementary service within a network including nodes, the method comprising the steps of:
 providing a server configured to maintain a timer monitoring a condition;   monitoring for a first clearing message;   upon expiry of the timer, transmitting at least one second clearing message; and   allowing the timer to expire when a first clearing message indicating the condition is received.   
   
   
       11 . An apparatus for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the apparatus comprising:
 an MSC server configured to perform the steps of:   receiving an invite message; and   sending a setup message comprising an information element indicating a call waiting tone on when the invite message comprises a call waiting indication.   
   
   
       12 . The apparatus of  claim 1  wherein the MSC server is further configured to perform the step of:
 storing an indication that the session includes a call waiting application server when the invite message comprises the call waiting indication.   
   
   
       13 . The apparatus of  claim 2  wherein the MSC server is further configured to perform the step of:
 if said indication that the session includes a call waiting application server is stored and receiving a response indicating that a UE does not support the communication waiting service to a UE that initiated said invite message and, where said UE involved in a first call does not support the communication waiting service, transmitting an unsupported media type response.   
   
   
       14 . The apparatus of  claim 2  wherein the MSC server is further configured to perform the steps of:
 if a timer expires:   (i) receiving a response, the response indicating # 19  (user alerting, no answer) or # 18  (no user responding), mapping the response to the  408  (Request Timeout) final response including a Reason header field with a protocol set to “Q.850” and a cause set to “ 19 ” or “ 18 ”, respectively; or   (ii) clearing the call and sending a response to the INVITE message.   
   
   
       15 . The apparatus of  claim 3 , where said response to the INVITE message is a final response prior to expiry of any timers associated with service logic in at least one of a Communication Waiting (CW) and a Communication Diversion (CDIV) application server. 
   
   
       16 . The apparatus of  claim 1  wherein the MSC server is further configured to perform the steps of:
 receiving a request with a Reason header field with the protocol set to “SIP” and the cause set to “ 408 ”; and   sending the first clearing message with the Cause information element set to cause # 102  “recovery on timer expiry”.   
   
   
       17 . An apparatus for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the apparatus comprising:
 an MSC server configured to perform the steps of:   receiving an invite message;   sending a setup message;   receiving a response message; and   when the response message comprises a call waiting indication, sending an alerting message comprising a carrier message for the Call Waiting notification.   
   
   
       18 . An apparatus for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the apparatus comprising:
 an MSC server configured to perform the steps of:   sending an invite message;   receiving a response message; and   when the response message comprises a call waiting indication, sending an alerting message comprising a carrier message for the Call Waiting notification.   
   
   
       19 . An apparatus for interworking a session by a Mobile Switching Center (MSC) server enhanced for IP Multimedia Subsystem (IMS) Centralized Services (ICS), the apparatus comprising:
 an MSC server configured to perform the steps of:   receiving an invite message; and   generating a SIP  415  ((Unsupported Media Type) response when the Communication Waiting or call waiting service is at least one of not supported, not allowed, and not subscribed to.   
   
   
       20 . An apparatus for facilitating a supplementary service within a network including nodes, the apparatus comprising:
 an MSC server configured to perform the steps of:   maintaining a timer monitoring a condition;   monitoring for a first clearing message;   upon expiry of the timer, transmitting at least one second clearing message; and   allowing the timer to expire when a first clearing message indicating the condition is received.