Transparent session initiated protocol

Abstract

Method and apparatus employing a transparent session initiation protocol (SIP) technique for communication especially between a user device in one domain and an application/service provided in an external domain. The transparent SIP technique is usable in wired or wireless systems such as 3G systems and wireless local area networks (WLANs).

1 . A method employed by a user device (UE) having a proxy agent and being capable of support by a third generation (3G) system, said method enabling the UE in one domain to communication with a third party application/content server in a domain external to the user device, the method comprising:
 the user device:
 generating an Invite communication; 
   the proxy agent:
 invoking a general packet radio service (GPRS) attach responsive to said Invite communication; 
 establishing a packet data protocol (PDP) context bearer employing a PDP context establishment procedure; 
 performing a directory name service (DNS) lookup and identifying the IP address, port and transport protocol for a Proxy  2  in the external domain; 
 establishing a packet switch (PS) call to a proxy server (Proxy  2 ) in said external domain; and 
 transmitting an Invite communication to said Proxy  2  to initiate a media session directly between said UE and said third party application/content server (AS). 
   
   
   
       2 . The method of  claim 1  wherein the Proxy  2 :
 provides an invite communication to the AS; and   said AS:
 initiates a session with the UE. 
   
   
   
       3 . A user device (UE) configured for operation in a first wireless domain having a capability to directly communicate with an application/content server (AS) in a second wireless domain outside of said first domain, the UE comprising:
 a mobile platform configured to support 3GPP, said mobile platform being further configured to:
 identify an Invite communication as intended for an external domain responsive to an Invite communication initiated by the UE; 
 invoke a general packet radio service (GPRS) attach; 
 perform a packet data protocol (PDP) context establishment procedure; 
 perform a directory name service (DNS) lookup and identify an IP address, port and transport protocol for a Proxy  2  in the second domain; and 
 establish a packet switched (PS) call to said Proxy  2  in said second domain. 
   
   
   
       4 . The UE of  claim 3  configured as a wireless UE wherein said mobile platform is a U-100 mobile platform. 
   
   
       5 . The UE of  claim 3  wherein the mobile platform is configured to support GPRS for the Global System for Mobile Telecommunications (GSM/GPRS) and wideband code division multiple access (WCDMA). 
   
   
       6 . The UE of  claim 3  wherein said mobile platform configured for dual-mode use. 
   
   
       7 . A wireless transmit receive unit (WTRU) having a proxy agent for wireless communication within a wireless network system and configured to operate in selected domain and to communicate with a third party application/content server in an external domain that is external to the selected domain, the WTRU being further configured to generate an Invite communication;
 said proxy agent being configured to:   invoke a general packet radio service (GPRS) attach responsive to said Invite communication;   establish a packet data protocol (PDP) context bearer employing a PDP context establishment procedure;   perform a directory name service (DNS) lookup and identifying the IP address, port and transport protocol for a proxy server (Proxy  2 ) in the external domain;   establish a packet switch (PS) call to the Proxy  2  in the external domain; and   transmit an Invite communication to the Proxy  2  to initiate a media session directly between the WTRU and the third party application/content server.