CN1964404B - A Method of Forwarding Incoming Call Notification in NGN - Google Patents

Abstract

The invention provides a method for notification of forwarded calls in NGN: in the NGN system, for a forwarded call, the system can play a prompt tone after the called party picks up the phone to inform that it is a forwarded call . Adopting the present invention enables the user to know whether it is a forwarded call or an ordinary call when the call is connected, and can choose whether to answer the forwarded call. If the call is hung up during the playing of the prompt tone, the call will not be charged, so Can improve customer satisfaction.

Description

A Method of Forwarding Incoming Call Notification in NGN

technical field

The invention belongs to the field of communication, in particular to a method for forwarding incoming call notification in NGN.

Background technique

In the NGN system of the next generation network, for forwarded calls, such as unconditional call forwarding (this service allows the user to transfer all his incoming calls to another designated number, regardless of the state of the user, CFU .), call forwarding on busy (if the user has registered for this service, all incoming calls to the user will be automatically forwarded to another specified number, CFB.), call forwarding on no answer (if If the user registers the service, when the phone that calls the user does not answer within the predetermined time, the call will be transferred to another designated number, CFNR.) etc., the telephone terminal cannot know that this is a forwarded call, For example: A calls B, and B forwards to C. When A calls B, C rings. If C picks up the phone, it will talk to A. User C does not know that the call is forwarded by B. If A directly calls C, For user C, the experience is the same, the calling number is displayed as A, and the two situations cannot be distinguished.

At present, in the fixed network, there is a method of distinguishing ringing to notify the forwarded call, which is to make the forwarded call a ringtone, and the non-forwarded call is a ringtone; in the mobile network, through the mobile terminal Give text hints. However, the prompting technology in the mobile network cannot be applied in the current fixed network, because the terminal of the fixed network does not have the intelligent function of the mobile terminal; This function conflicts with the function of differential ringing for forwarded calls, and the user still cannot know that the call is a forwarded call; in addition, the gateway needs to support differential ringing under NGN, so gateway users that do not support this capability cannot use it ; The way to distinguish the ringing needs to distinguish the ringing tone, and there is no direct way of voice prompts.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method so that the called party can be notified that the current call is a forwarded call.

To achieve the above object, the present invention provides a method for forwarding incoming call notification in NGN, the method comprising:

Step A: User A initiates a basic call, and the softswitch inquires whether the called party B has registered the call forwarding service. If yes, and the forwarding condition is met, the call is connected to the forwarding user C;

Step B: If user C picks up the phone, the softswitch applies for MRS media resources and notifies C that the call is a forwarded call.

Wherein, also include step C: if neither the calling party nor the called party hangs up after the notification ends, the soft switch connects A and C; if either the calling party or the called party hangs up before the notification ends, the soft switch ends the call.

Wherein, the MRS notifies the forwarding user that the call is an incoming forwarding call by playing a prompt tone.

Wherein, in step B, when the called party picks up the hook to accept the notification, the softswitch does not send the ANM to the forward office.

Wherein, step A: user A calls user B, and the softswitch detects the IAM message that PSTN sends, and judges whether it is the call forwarded to, and if so, then connects to forwarded user C;

Step B: If user C picks up the phone, the softswitch applies for MRS media resources and notifies C that the call is a forwarded call.

Among them, step A is specifically: user A calls user B, and the softswitch detects whether the forwarded-to number in the IAM message sent by the PSTN is consistent with the called number. c.

Wherein, step A is specifically: user A calls user B, and the softswitch detects the forwarding sign in the IAM message that PSTN sends, and judges whether it is a forwarded call, and if so, then connects to forwarding user C.

Wherein, also include step C: if neither the calling party nor the called party hangs up after the notification ends, the soft switch connects A and C; if either the calling party or the called party hangs up before the notification ends, the soft switch ends the call.

Wherein, the MRS notifies the forwarding user that the call is an incoming forwarding call by playing a prompt tone.

Wherein, in step B, when the called party picks up the hook to accept the notification, the softswitch does not send the ANM to the forward office.

Adopting the present invention enables the user to know whether it is a forwarded call or an ordinary call when the call is connected, and can choose whether to answer the forwarded call; if the call is hung up during the playing of the prompt tone, the call will not be charged, so Can improve customer satisfaction.

Description of drawings

Fig. 1 is the calling schematic diagram of the present invention;

Fig. 2 is a flow chart of the method of the present invention.

Detailed ways

The present invention is a method for notification of forwarded incoming calls in NGN. In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

As shown in Figure 1, user B is a subscriber for forwarding incoming calls. When user A initiates a basic call to user B and meets the conditions for forwarding incoming calls, the call is forwarded to user C; user D is the subscriber for forwarding incoming calls. Subscriber, when user A initiates a basic call to user D and meets the call forwarding conditions, the call is forwarded to user C. For user C, the two forwarded calls belong to two situations: one is a call forwarded through the public switched telephone network PSTN, and the other is a call forwarded in the local office. Introduce the concrete realization of the present invention under two kinds of situations respectively below:

(1) Call forwarded through PSTN

As shown in Figure 1, user A calls user B, the call is forwarded to user C, the PSTN routes the call to the soft switch, and the initial address information (initial address message, IAM) message sent by the PSTN to the soft switch using the ISUP protocol includes The calling number A, the called number C, and the forwarded number B, the softswitch detects the forwarded number and the called number, and finds that the call is inconsistent, then judges that the call is a forwarded call, and connects to the called C, and C rings; Or, the soft switch detects the forwarding sign in the IAM message to determine whether it is a forwarded call, if so, then connects the called C, and C rings; if C picks up, the soft switch applies for a media resource MRS, and notifies the called party The call called C is a forwarded call; when the called party picks up the hook and listens to the announcement, the softswitch does not send an answer message (ANM) to the forward office, so as to ensure that during the announcement, The caller is still ringing, and billing will not be activated; if the caller and the called party do not hang up after the notification, then the caller and called party A and C will be connected; if either party hangs up, the call will end and the call will be removed.

(2) Calls forwarded within the office

As shown in Figure 1, user B' and user C are local office users directly connected to the soft switch through the media gateway. User A calls user B', and the call is forwarded to user C. Since user B is a call forwarding service registered on the softswitch, the softswitch controls the forwarding process, so of course the softswitch knows that the call is a forwarding call. Then the call is connected to the called C, and C rings; if C picks up the hook, the softswitch applies for media resources MRS, and notifies the called C that the call is a forwarded call; during the callee picks up the hook and listens to the announcement , the softswitch does not send ANM to the forward office, so as to ensure that the caller is still ringing during the announcement, and the billing will not be activated; C; If either the calling party or the called party hangs up, the call is terminated and the call channel is removed.

Preferably, the called party is informed that the call is a forwarded call in a very direct and clear way of playing a prompt tone. The announcement process adopts the standard H.248 protocol.

As shown in Figure 2, the concrete implementation processing flow that realizes the method of the present invention is as follows:

101: The caller goes off-hook, and the terminal A0 corresponding to the caller reports the event to the softswitch through the NTFY_REQ message, and the softswitch confirms the receipt of the user off-hook event, and responds with a response message NTFY_REPLY;

102: The softswitch instructs the calling user corresponding to the calling terminal A0 to play a dial tone through the MOD_REQ command; terminal A0 responds to the MOD_REPLY message;

103: The calling party dials, terminal A0 reports the collected number to the softswitch through the NTFY_REQ message, and the softswitch sends the NTFY_REQ command to confirm receipt of the message;

104: The softswitch sends an ADD_REQ message, requesting to add terminal A0 to the newly established context Context, and terminal A0 responds to the ADD_REPLY message;

105: The softswitch analyzes the called number, finds the terminal corresponding to the called terminal, and sends a ringing signal to the called terminal corresponding to the terminal; when the call forwarding condition is triggered, the call is forwarded to C, and the softswitch finds the terminal C0 corresponding to C , send an ADD_REQ message to C0, requesting to add the terminal C0 to the newly established Context, and the terminal C0 responds to the ADD_REPLY message;

106: The softswitch instructs the called user corresponding to the called terminal C0 to play the ring tone through the MOD_REQ command; and instructs the calling user corresponding to the calling terminal A0 to play the ring tone through the MOD_REQ command; the terminal replies to the MOD_REPLY message;

107: The called terminal picks up the phone, and the called terminal sends NTFY_REQ to report the event to the softswitch; the softswitch responds with NTFY_REPLY; the softswitch sends a MOD_REQ command to the called terminal C0, and the terminal replies with a MOD_REPLY message;

108: The softswitch sends an ADD_REQ message to the media resource server (MRS), applying for MRS to play the call to the called party, and the MRS responds with an ADD_REPLY message; the softswitch sends a MOD_REQ command to modify the attributes of the MRS, and the MRS replies with a MOD_REPLY message, and plays a reminder to the called party C sound;

109: When the timer set by the softswitch expires, the softswitch deletes the context between the called terminal C0 and the MRS; or when the MRS finishes playing the voice prompt, it sends NTFY-_REQ to the softswitch to report the event, and the softswitch replies with NTFY_REPLY, And send SUB_REQ command to delete the context Context between terminal C0 and MRS, MRS replies SUB_REPLY;

110: The softswitch sends a MOD_REQ command to modify the attributes of the calling terminal A0, and A0 replies with a MOD_REPLY message, connects the calling terminal and the called terminal, and starts talking.

In any of the above steps, the calling party or the called party hangs up, and the softswitch commands the gateway to release the connection between the calling party and the called party, and empty the Context of the calling/called port. If the calling or the called hangs up during the playback, the call will be terminated, indicating that the call will not be answered. Since the caller has not received the answer signal, the call that the called party refuses to answer will not be charged.

This invention is also applicable to the situation of multi-domain forwarding where the calling party and the called party belong to different softswitches. In the process, only a process of finding the softswitch to which the called party belongs is added in step 105, and other steps are completely the same.

Claims (7)

1. A method for forwarding incoming call notification in NGN, characterized in that it comprises: Step A: User A calls user B, and the softswitch judges whether the call is a forwarded call, and if so, connects to forwarded user C; Step B: If user C picks up the phone, the softswitch applies for a media resource MRS, and notifies C that the call is a forwarded call. 2. the method for forwarding incoming call notification in NGN as claimed in claim 1, is characterized in that: Step C is also included: if neither the calling party nor the called party hangs up after the notification ends, the soft switch connects A and C; if either the calling party or the called party hangs up before the notification ends, the soft switch ends the call. 3. the method for forwarding incoming call notification in NGN as claimed in claim 1, is characterized in that: The MRS notifies the forwarding user that the call is an incoming forwarding call by playing a prompt tone. 4. the method for forwarding incoming call notification in NGN as claimed in claim 1, is characterized in that: In step B, the softswitch does not send the ANM to the forward office when the called party picks up the hook to accept the notification. 5. The method for forwarding incoming call notification in the NGN according to any one of claims 1-4, characterized in that: Step A is specifically: user A calls user B, and the softswitch detects whether the forwarding number in the IAM message sent by the PSTN is consistent with the called number. 6. The method for forwarding incoming call notification in the NGN according to any one of claims 1-4, characterized in that: Step A is specifically: user A calls user B, and the soft switch detects the forwarding sign in the IAM message sent by PSTN, and judges whether it is a forwarded call, and if so, then connects to forwarding user C. 7. The method for forwarding incoming call notification in the NGN according to any one of claims 1-4, characterized in that: User A calls user B, and the softswitch inquires whether the called party B has registered the call forwarding service. If yes, and the forwarding condition is met, the softswitch is connected to the forwarding user C.