Method and apparatus for providing call transfer business for user
一种呼叫转移、呼叫前转的技术，应用在通信领域，能够解决不能用户提供呼叫转移业务、未提供CS域接入用户呼叫转移通知方案等问题
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Embodiment 1
[0072] Embodiment 1: Method 1 of providing CFNRc service, see Figure 5 shown, including the following steps:
[0073] 1-2. ICCF receives a call directed to user UE-A;
[0074] 3-4. The ICCF issues the call through the CS domain;
[0075] 5. The mobile switching center MSC fails to page user UE-A or fails to obtain the roaming number;
[0076] 6. The MSC returns a Release message, which carries the failure reason: paging failure (user unreachable);
[0077] 7. The media gateway control function entity MGCF converts the Release message (user unreachable) into a SIP 480 message (temporary unavailable response message), and sends it to the ICCF;
[0078] 8. According to the fact that ICCF did not receive 180 message (ringing response message) before, it received 480 message (temporary unavailable response message) at this time, and perceives that user UE-A is "unreachable"; therefore ICCF returns 503 to TAS message, to inform the telecom service application server TAS (telepm...
Embodiment 2
[0082] Embodiment 2: The second way of providing CFNRc service, see Image 6 shown, including the following steps:
[0083] 1-2. ICCF receives a call directed to user UE-A;
[0084] 3-4. The ICCF issues the call through the CS domain;
[0085] 5. The MSC fails to page user UE-A or fails to obtain the roaming number;
[0086] 6. The MSC returns a Release message, which carries the failure reason: paging failure (user unreachable);
[0087] 7. The MGCF converts the Release (user unreachable) into a SIP 503 message, and sends it to the ICCF;
[0088] 8. The ICCF judges that UE-A is unreachable according to the received 503 message, and returns a 503 message to the TAS, and the TAS executes the CFNRc service.
[0089] [Note] 1. MGCF can also convert Release (user unreachable) into other unreachable response messages in SIP, such as: SIP408 message or SIP500 message.
[0090]2. There may be two situations where the user is unreachable: when the MSC fetches the user’s roaming n...
Embodiment 3
[0092] Embodiment 3: The third way of providing CFNRc service, see Figure 7 shown, including the following steps:
[0093] 1-2. ICCF receives a call directed to user UE-A;
[0094] 3. The ICCF sends the call to the MSC through the USSD message;
[0095] 4. The MSC sends a Page message to page user UE-A, but user UE-A does not respond;
[0096] 5. The MSC returns to the ICCF that the user UE-A does not respond through a USSD message;
[0097] 6. The ICCF learns that UE-A is unreachable through the USSD response message, and returns a 503 message to the TAS, and the TAS executes the CFNRc service.
[0098] [Note] 1. The above is just an example of ICCF converting the user unreachable status into a 503 response message. ICCF can also convert the user unreachable status into other unreachable response messages in SIP, such as: 408 message or 500 The message is passed to TAS, and TAS will also execute CFNRc.
[0099] 2. Pre-set the business logic corresponding to different re...
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