UA1 attempts the transfer by sending a REFER request to UA2 with the URI of UA3 in the Refer-To header field. The Refer-To header field also contains an escaped Replaces header field containing the dialog identifiers (call-ID, From tag, and To tag) for the dialog between UA1 and UA3. UA1 then establishes another session with UA3 to alert UA3 of the impending transfer. UA1(the transferor) wants to transfer UA2(the transferee) to UA3(the transfer target). In this example, UA1 establishes a session with UA2. An example call flow for an attended call transfer can be seen below. SIP Attended Call TransferĪ second, more complicated form of call transfer is known as an attended transfer. Once UA1 knows that the transfer has succeeded, it ends the session with UA2 by sending it a BYE. When UA3 accepts the INVITE, UA2 alerts UA1 that the transfer was successful by sending a NOTIFY message to UA1 with a sipfrag message body with the start line of a ‘200 OK’ final response. UA2 then sends an INVITE to UA3 using the URI that it learned in the Refer-To header field of the REFER message. UA2 also updates UA1 on the status of the transfer by sending a NOTIFY message to UA1 with a sipfrag message body which consists of only the start line of a ‘100 Trying’ provisional response. UA2 responds to the REFER with a 202 response indicating that the request was acceptable. UA1 attempts the transfer by sending a REFER request to UA2 with the URI of UA3 in the Refer-To header field. UA1(the transferor)wants to transfer UA2(the transferee) to UA3(the transfer target). An example call flow for a blind call transfer can be seen below. The most basic form of call transfer is known as a blind call transfer. Some examples of these services include blind transfer and attended transfer. The IETF “Session Initiation Protocol Call Control – Transfer” describes methods by which SIP UAs can provide call transfer services using such SIP extensions as REFER (RFC 3515), Replaces (RFC 3891), Referred-By (RFC 3892),and sipfrag (RFC 3420). The red light around the button indicates when the fuel pump is on, and fuel is being transferred.SIP provides a mechanism for transferring calls from one User Agent (UA) to another. Pressing the button again will turn off the pump. As a safety feature to prevent overfilling, the button will not do anything when the main tank is over 85%. When the button is pressed, and the main tank is below 85%, the pump will turn on for a five-minute cycle or until the main tank’s fuel capacity is at 85% or above. You can use the button to manually transfer fuel. TRAX 4 comes with a manual fuel transfer button. The app is available for Apple IOS and Android (version 7 or newer). You also have the option of displaying either the gallons or the percentage of fuel in each tank. During fuel transfer, the message “Pump On” will be displayed. In no time, you’ll be able to monitor your pickup’s fuel capacity. Want to know the status of your on-board fuel systems? Simply download the TRAX 4 app to your smart phone and enter your vehicle and fuel system information. Based on the capacity of a pickup’s main fuel tank and the capacity of the Transfer Flow auxiliary fuel tank, the TRAX 4 system will transfer fuel at pre-determined levels while the vehicle is in operation. TRAX 4 comes with our auxiliary fuel tank systems, including their auxiliary tank and tool box combos. The Transfer Flow TRAX 4 is a computer-controlled, fuel management system that transfers fuel from a Transfer Flow auxiliary fuel tank to a pickup’s main fuel tank.
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