Using non-ims connections in ims sessions

A method comprising:

• receiving, from a first electronic device, a non-IMS Session Initiation Protocol (SIP) message through an IP network;
• identifying a request to initiate an IMS communication session through the IMS network with a second electronic device based, at least in part, on the non-IMS SIP message;
• initiating the IMS communication session with the second electronic device in response to the request;
• receiving, from the first electronic device, a first SIP message through an IMS network;
• and
• associating the received first SIP message with the initiated IMS communication session.

A method comprising:

• receiving, from a first electronic device, a first session initiation protocol (SIP) message through an IMS network;
• identifying Session Description Protocol (SDP) information and a request for initiating a SIP INVITE session between the first electronic device and the application server based, at least in part, on the received first SIP message, wherein the SIP INVITE session is routed through the IMS network;
• initiating an IMS communication session based on the SDP information;
• initializing a resource reservation procedure with the first electronic device in response to the request;
• receiving, from the first electronic device, a non-IMS SIP message through the IMS network;
• identifying an indication associated with a request for activating a bearer for a media service for the IMS communication session base, at least in part, on the received non-IMS SIP message;
• and
• transmitting a second SIP message for initiating a bearer activation procedure in response to the indication.