Method of sending and receiving call with specific request

1. A method of processing a call, comprising:

generating a specific code indicative of a specific request;

modifying a call according to the specific code, and then sending the call to a receiver for notifying the receiver of the specific request, wherein the modifying step comprises encoding the specific code in a specific information element (IE) of the call which has not been transmitted from a communication device before the call is transmitted to the receiver;

determining whether a received call is a specific request call; and

generating an indication in response to the specific request when the received call is determined to be the specific request call.

2. The method of claim 1 , wherein the step of modifying the call according to the specific code comprises adding the specific code to the call.

3. The method of claim 1 , wherein the specific code is an emergency code indicative of an emergency request.

4. The method of claim 1 , wherein the specific code is a silence mode code indicative of a silence request, and the step of generating the indication in response to the specific request comprises:

the receiver associated with the received call entering a silence mode.

5. A method of sending a call, comprising:

generating a specific code indicative of a specific request;

and

adding the specific code to a call, and then sending the call to a receiver for notifying the receiver of the specific request;

wherein the specific code is encoded in a specific information element (IE) of the call which has not been transmitted from a communication device before the call is transmitted to the receiver.

6. The method of claim 5 , wherein the specific code corresponds to a specific key sequence, and the step of sending the call to the receiver comprises:

sending the specific key sequence with a phone number associated with the receiver to thereby send the call to the receiver.

7. A method of receiving a call, comprising:

determining whether a received call is a specific request call including a specific code that is encoded in a specific information element (IE); and

generating an indication in response to the specific request when the received call is determined to be the specific request call;

wherein the specific code is received before notifying a user of the incoming call.

8. The method of claim 7 , wherein the step of determining whether the received call is the specific request call comprises determining whether the received call comprises a specific code indicative of a specific request.

9. The method of claim 8 , wherein the specific code is an emergency code indicative of an emergency request, and the step of generating the indication in response to the specific request comprises:

adjusting volume or vibration of the receiver associated with the received call.

10. The method of claim 8 , wherein the specific code is a silence mode code indicative of a silence request, and the step of generating the indication in response to the specific request comprises:

the receiver associated with the received call entering a silence mode.

11. The method of claim 7 , wherein a receiver associated with the received call enters a power saving mode in which the receiver only activates circuits in the receiver corresponding to a network connecting at a predetermined frequency.

12. The method of claim 7 , wherein a receiver associated with the received call enters a power saving mode, and the method further comprises:

the receiver listening to paging signals at a predetermined frequency lower than a normal paging frequency.

13. The method of claim 12 , wherein the predetermined frequency is determined according to a frequency of reserving an access grant channel (AGCH) block as a paging block.

14. The method of claim 7 , wherein the step of determining whether the received call is the specific request call is performed in a receiver associated with the received call.

15. The method of claim 7 , wherein the step of determining whether the received call is the specific request call is performed by a communication network, and the communication network further pages a receiver associated with the received call by a specific paging mode according to the specific request call.

16. The method of claim 7 , further comprising:

when a receiver associated with the received call is not in a service area of a first communication network it registers, transferring the received call from the first communication network to a second communication network.

17. The method of claim 16 , further comprising:

when the receiver associated with the received call is not in the service area of the first communication network it registers, updating location information of the receiver to a communication network whose service area covers the receiver.

18. The method of claim 17 , wherein the step of updating location information of the receiver to the communication network comprises:

sending a location update request comprising a specific IE for notifying the communication network of a limited-service request;

accepting of the location update request by the communication network; and

forwarding the location information contained in the location update request to the first communication network.

19. The method of claim 18 , wherein the step of transferring the received call from the first communication network to the second communication network comprises:

through referring to the location information, determining a communication network whose service area covers the receiver to be the second communication network; and

transferring the received call from the first communication network to the second communication network.

20. The method of claim 17 , wherein the step of updating location of the receiver to the communication network whose service area covers the receiver comprises:

sending a location update request with a specific location update type for notifying the communication network of a limited-service request;

accepting of the location update request by the communication network; and

forwarding the location information contained in the location update request to the first communication network.

21. The method of claim 20 , wherein the step of transferring the received call from the first communication network to the second communication network comprises:

through referring to the location information, determining a communication network whose service area covers the receiver to be the second communication network; and

transferring the received call from the first communication network to the second communication network.

22. A method of receiving a call, comprising:

activating circuits in a receiver corresponding to a network connection at a first predetermined frequency or listening to paging signals at a second predetermined frequency lower than a normal paging frequency when the receiver enters a power saving mode;

determining whether a received call is a specific request call; and

generating an indication in response to the specific request when the received call is determined to be the specific request call.

23. A method of receiving a call, comprising:

utilizing a communication network to determine whether a received call is a specific request call; and

paging a receiver associated with the received call by a specific paging mode according to the specific request call;

wherein the specific request call has included a specific code before the specific request call is sent to the receiver, and the specific code is inputted into the specific request call which has not been transmitted from a communication device.

24. A method of receiving a call, comprising:

determining whether the call is a specific request call; and

when a receiver associated with the received call is not in a service area of a first communication network, transferring the received call from the first communication network to a second communication network;

wherein the specific request call has included a specific code, and the specific code is received before notifying a user of the incoming call.