Method and system for realizing call transfer in private branch exchange (PBX) relay mode in next generation network (NGN)

Abstract

The invention discloses a method for realizing call transfer in a private branch exchange (PBX) relay mode in a next generation network (NGN). The method comprises the following steps that: when a call from a calling number to a called number is consistent with the triggering condition of the call transfer, a PBX initiates a secondary call from the called number to a transfer number, and transmits a message carrying the calling number, a redirecting number and a new called number to an NGN side, wherein the redirecting number is the original called number, and the new called number is the transfer number; and the NGN side receives the message, performs calling number authentication and charging on the redirecting number, and establishes a call from the calling number to the new called number to finish the call transfer after the redirecting number passes the calling number authentication. The invention also discloses a system for realizing the call transfer in the PBX relay mode in the NGN. According to the method and the system, both caller identification and charging can be ensured to be normal when the NGN enables caller authentication.

Description

technical field [0001] The invention relates to the technical field of voice switching (NGN), in particular to a method and a system for realizing call transfer in a PBX relay mode under the NGN network. Background technique [0002] Compared with individual users, large-scale group voice users have the characteristics of large traffic volume and rich service requirements. When a single user in the group is not in the office, they cannot normally answer the desk phone. Therefore, it is hoped that a method can be used to connect the call of the desk phone to a mobile terminal such as a mobile phone, and the call forwarding function comes into being. like figure 1 As shown, large-scale group users usually have self-built user-level exchange (PBX) equipment, and access the operator's NGN network through a digital trunk line. This access mode is called the PBX trunk mode under the NGN network. The call forwarding function in the PBX trunk mode is that when user A on the networ...

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the implementation scheme of the PBX trunk mode call transfer function under the existing NGN network that the triggering of call forwarding, secondary calling, calling change and billing in the existing scheme are all implemented by the PBX, although the call transfer function can be implemented. However, since the PBX must change the calling number when the call is forwarded after NGN on the network side enables calling authentication, the number displayed by user C on the caller ID is the number of user B, and the actual calling number cannot be displayed normally. Call user A's number

[0006] But if the caller authentication is not enabled on the NGN network, although the PBX does not need to change the calling number and can display the caller ID number of the calling user A normally, but because the calling user is not a user under the PBX, the PBX cannot perform this call. Billing, and there is a risk of illegal calls to users under the PBX, which is unacceptable

[0007] To sum up, in the PBX trunk mode of the existing NGN network, when the caller authentication is enabled on NGN, the call forwarding function will cause caller ID errors; when the caller authentication is not enabled on NGN, the call forwarding function will cause billing errors and illegal call danger

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