CN108270938B - Call processing method and switching device - Google Patents
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明实施例涉及通信技术，尤其是一种呼叫处理的方法和交换装置。Embodiments of the present invention relate to communication technologies, and in particular, to a call processing method and switching device.
背景技术Background technique
在IP电话网络系统(英文：IP Telephony)中，普通老式业务(英文：Plain OldTelephone Service，缩写：POTS)通常由IP用户级交换机(英文：IP Private BranchExchange，缩写IP-PBX)的会话发起协议(英文：Session Initiation Protocol，缩写：SIP)中继接入到IP多媒体子系统(英文：IP Multimedia Subsystem，缩写IMS)网络中。如图1所示，当POTS机作为主叫终端出局呼叫时，IP-PBX发送INVITE消息给IMS，被叫用户振铃。在被叫用户摘机之前，SIP定义了18X消息来响应主叫侧发送的INVITE消息，并给主叫用户播放彩铃或者回铃音。由于18X消息的语音媒体流处理是在摘机通话媒体200OK之前，所以叫早期媒体处理。其中，IMS发送18X消息一般有两种方式：In the IP telephony network system (English: IP Telephony), the plain old service (English: Plain OldTelephone Service, abbreviation: POTS) is usually initiated by the session initiation protocol (English: IP Private BranchExchange, abbreviated IP-PBX) English: Session Initiation Protocol, abbreviation: SIP) relay access to IP Multimedia Subsystem (English: IP Multimedia Subsystem, abbreviated IMS) network. As shown in Figure 1, when the POTS machine acts as the calling terminal to make an outgoing call, the IP-PBX sends an INVITE message to the IMS, and the called user rings. Before the called user goes off-hook, SIP defines the 18X message to respond to the INVITE message sent by the calling side, and plays the CRBT or ringback tone to the calling user. Since the voice media stream processing of the 18X message is before the off-hook call media 200OK, it is called early media processing. Among them, there are generally two ways for IMS to send 18X messages:
1)，IMS发送的18X消息不携带会话描述协议(英文：Session DescriptionProtocol，英文：SDP)信息，由IP-PBX申请本地的放音资源给话机放回铃音；1) The 18X message sent by the IMS does not carry the Session Description Protocol (English: Session Description Protocol, English: SDP) information, and the IP-PBX applies for local playback resources to play the ringback tone on the phone;
2)，IMS发送的18X消息携带SDP，话机听远端提示音，由IMS给话机放提示音。2), the 18X message sent by the IMS carries the SDP, the phone listens to the remote prompt tone, and the IMS plays the prompt tone to the phone.
当IMS侧回复18X消息携带SDP时，IP-PBX开启网络端口接收对端提示音媒体流。但是，有的时候主叫POTS用户既听不到远端提示彩铃，也听不到PBX本地播放的回铃音。主叫话机长时间处于静音状态，导致主叫用户无法知道电话是否打通。When the IMS side replies with the 18X message carrying the SDP, the IP-PBX opens the network port to receive the media stream of the peer prompt tone. However, sometimes the calling POTS user can neither hear the remote CRBT nor the ringback tone played locally by the PBX. The calling phone is in the silent state for a long time, so that the calling user cannot know whether the call is connected.
发明内容SUMMARY OF THE INVENTION
有鉴于此，本申请实施例提供了一种呼叫处理方法和交换装置，可以避免现有技术中发生的主叫用户无法知道电话是否打通的问题。In view of this, the embodiments of the present application provide a call processing method and a switching device, which can avoid the problem in the prior art that the calling user cannot know whether the call is connected.
本申请实施例提供了一种呼叫方法，该方法由IP-PBX执行。该方法具体包括：IP-PBX接收主叫终端发送的呼叫请求，为本次呼叫分配并记录本端用于接收媒体流的IP地址和端口号；向被叫终端所在的IP多媒体子系统IMS发送INVITE消息，该INVITE消息中包括所述本端接收媒体流的IP地址和端口号；接收所述IMS返回的18x消息，记录所述18x消息中包括的IMS侧播放媒体流的IP地址和端口号；确定在预定的时间内，所述本端接收媒体流的IP地址和端口号上没有接收到所述IMS侧播放媒体流的IP地址和端口号发送的多媒体报文，申请本地数字信号处理资源，为所述主叫终端播放本地回铃音。The embodiment of the present application provides a calling method, and the method is executed by an IP-PBX. The method specifically includes: the IP-PBX receives the call request sent by the calling terminal, allocates and records the IP address and port number used by the local end for receiving the media stream for this call; INVITE message, the INVITE message includes the IP address and port number of the local end receiving the media stream; receiving the 18x message returned by the IMS, recording the IP address and port number of the IMS side playing the media stream included in the 18x message Determine that within a predetermined time, the IP address and port number that the local end receives the media stream does not receive the multimedia message sent by the IP address and port number that the IMS side plays the media stream, and applies for local digital signal processing resources , and play the local ringback tone for the calling terminal.
可以理解的是，这里的本端是指IP-PBX，主叫终端是使用POTS业务的终端，被叫终端则是IMS终端，而被叫终端所在的IMS则是指为被叫终端提供服务的IMS。其中的多媒体报文具体可以是实时传输协议(英文：Real-Time Transport Protocol，缩写：RTP)报文。根据实际需求，可以设定不同的预定时长，比如设置为500ms。It can be understood that the local end here refers to the IP-PBX, the calling terminal is the terminal that uses the POTS service, the called terminal is the IMS terminal, and the IMS where the called terminal is located refers to the terminal that provides services for the called terminal. IMS. The multimedia message may specifically be a Real-Time Transport Protocol (English: Real-Time Transport Protocol, abbreviation: RTP) message. Different predetermined durations can be set according to actual needs, for example, 500ms.
在一个可能的设计中，上述的方法还进一步包括：确定在预定的时间内，所述本端接收媒体流的IP地址和端口号上接收到所述IMS侧播放媒体流的IP地址和端口号发送的多媒体报文，将接收到的所述多媒体报文转换成模拟信号发送给所述主叫终端。In a possible design, the above method further includes: determining the IP address and port number of the media stream played by the IMS side on the IP address and port number of the local end receiving the media stream within a predetermined time. For the sent multimedia message, the received multimedia message is converted into an analog signal and sent to the calling terminal.
可选的，上述的方法中，18x消息为180消息或183消息。Optionally, in the above method, the 18x message is a 180 message or a 183 message.
本发明的另一方面，本申请实施例提供了一种交换装置，该交换装置包括处理器、外部交换站、数字信号处理器和网口，其中，所述FXS，用于从主叫终端接收呼叫请求，并将所述呼叫请求发送给DSP；所述数字信号处理器，用于将接收到的呼叫请求转发给处理器，及提供数字信号处理资源；所述处理器，用于接收为该呼叫分配的本端接收媒体流的IP地址和端口号，记录所述本端接收媒体流的IP地址和端口号，并向IMS发送INVITE消息，在所述INVITE消息中携带所述本端接收媒体流的IP地址和端口号；用于从网口接收IMS返回的18x消息，记录所述18x消息中包括的IMS侧播放媒体流的IP地址和端口号；且，还用于确定在预定的时间内，所述本端接收媒体流的IP地址和端口号上没有接收到从所述IMS侧播放媒体流的IP地址和端口号发送的多媒体报文，向所述的数字信号处理器申请数字信号处理资源，根据申请到的数字信号处理资源为主叫终端播放本地回铃音。In another aspect of the present invention, an embodiment of the present application provides a switching device, the switching device includes a processor, an external switching station, a digital signal processor, and a network port, wherein the FXS is used for receiving from a calling terminal call request, and send the call request to the DSP; the digital signal processor is used to forward the received call request to the processor and provide digital signal processing resources; the processor is used to receive the call request as the The IP address and port number of the local end receiving the media stream assigned by the call distribution, recording the IP address and port number of the local end receiving the media stream, and sending an INVITE message to the IMS, and carrying the media stream received by the local end in the INVITE message The IP address and port number of the stream; it is used to receive the 18x message returned by the IMS from the network port, and record the IP address and port number of the media stream played on the IMS side included in the 18x message; and, also used to determine at a predetermined time If the IP address and port number of the media stream received by the local end do not receive the multimedia message sent from the IP address and port number of the media stream played from the IMS side, apply for a digital signal to the digital signal processor. Processing resources, playing the local ringback tone for the calling terminal according to the digital signal processing resources applied for.
在一种可能的设计中，所述处理器，还用于确定在预定的时间内，所述本端接收媒体流的IP地址和端口号上接收到从所述IMS侧播放媒体流的IP地址和端口号发送的多媒体报文，将所述接收到的多媒体报文转换成模拟信号发送给所述主叫终端。In a possible design, the processor is further configured to determine, within a predetermined time, the IP address of the local end for receiving the media stream and the port number for receiving the IP address for playing the media stream from the IMS side and the multimedia message sent by the port number, and convert the received multimedia message into an analog signal and send it to the calling terminal.
上述提及的“本端”是指交换装置端，18x消息是180消息或者183消息。在实际应用中，交换装置可以是IP-PBX，主叫终端是使用POTS业务的终端，被叫终端则是IMS终端，而被叫终端所在的IMS则是指为被叫终端提供服务的IMS。其中的多媒体报文具体可以是实时传输协议(英文：Real-Time Transport Protocol，缩写：RTP)报文。根据实际需求，可以设定不同的预定时长，比如设置为500ms。The "local end" mentioned above refers to the switching device end, and the 18x message is the 180 message or the 183 message. In practical applications, the switching device may be an IP-PBX, the calling terminal is a terminal using POTS services, the called terminal is an IMS terminal, and the IMS where the called terminal is located refers to the IMS that provides services for the called terminal. The multimedia message may specifically be a Real-Time Transport Protocol (English: Real-Time Transport Protocol, abbreviation: RTP) message. Different predetermined durations can be set according to actual needs, for example, 500ms.
现有技术中，当18x消息中携带SDP时，IP-PBX会利用网口接收IMS侧发送的多媒体报文，此时如果IP-PBX并未能够如期接收到IMS侧发送的多媒体报文，那么主叫用户侧一直处于静音状态，无从知晓会话是否已经接通。而本申请提供的实施例中，IP-PBX如果在预定的时间内没有检测到从IMS侧发出的媒体流，会申请本地数字信号处理资源，为主叫终端播放本地回铃音。从而避免了主叫侧一直静音，使得主叫用户无法知晓会话是否接通的问题。In the prior art, when the 18x message carries SDP, the IP-PBX will use the network port to receive the multimedia message sent by the IMS side. If the IP-PBX cannot receive the multimedia message sent by the IMS side as expected, then The calling user side is always in the mute state, and there is no way to know whether the conversation has been connected. However, in the embodiment provided in this application, if the IP-PBX does not detect the media stream sent from the IMS side within a predetermined time, it will apply for local digital signal processing resources and play the local ringback tone for the calling terminal. This avoids the problem that the calling side is always muted, so that the calling user cannot know whether the session is connected.
附图说明Description of drawings
为了更清楚地说明本发明实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍。In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments will be briefly introduced below.
图1是一种通信系统的组网示意图；Fig. 1 is a kind of networking schematic diagram of a communication system;
图2是一种呼叫处理方法的流程示意图；2 is a schematic flowchart of a call processing method;
图3是一种交换装置的结构示意图。FIG. 3 is a schematic structural diagram of a switching device.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例提供的技术方案进行描述。The technical solutions provided by the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
如图1所示，本发明实施例提供的一种通信网络，该网络包括：IP-PBX、IMS，其中，IMS包括会话边界控制器(Session Border Controller，SBC)、IMScore。其中，IP-PBX，用于完成用户终端与IMS之间的电话交换。在本发明的实施例中，PBX通过SBC接入到IMS的IMScore；其中，IMS core提供基于IP技术的话音、数据和多媒体业务以及新的应用。As shown in FIG. 1 , a communication network provided by an embodiment of the present invention includes: IP-PBX and IMS, where the IMS includes a Session Border Controller (Session Border Controller, SBC) and IMScore. Among them, the IP-PBX is used to complete the telephone exchange between the user terminal and the IMS. In the embodiment of the present invention, the PBX accesses the IMS core of the IMS through the SBC; wherein, the IMS core provides voice, data and multimedia services and new applications based on IP technology.
本发明实施例提供了一种呼叫处理方法，应用于上述图1所示的通信系统中，由使用模拟电话业务的主叫终端向IMS的被叫终端发起呼叫为例。参考图2，该方法具体包括：An embodiment of the present invention provides a call processing method, which is applied to the communication system shown in FIG. 1 , where a calling terminal using an analog telephone service initiates a call to a called terminal in the IMS as an example. Referring to Figure 2, the method specifically includes:
步骤201，当使用模拟电话业务的终端作为主叫终端摘机拨号，向IMS侧发送呼叫请求，该呼叫请求被接续到IP-PBX。Step 201, when the terminal using the analog telephone service as the calling terminal goes off-hook and dials, a call request is sent to the IMS side, and the call request is connected to the IP-PBX.
步骤202，IP-PBX为本次呼叫分配本端用于接收媒体流的IP地址和端口号，且向IMS发送INVITE，该INVITE消息通过SBC发送到IMS core。其中，该INVITE消息中包括用于媒体协商的SDP信息，该SDP信息中包括所述IP-PBX用于接收媒体流的IP地址和端口。Step 202, the IP-PBX allocates the IP address and port number of the local end for receiving the media stream for this call, and sends an INVITE to the IMS, and the INVITE message is sent to the IMS core through the SBC. Wherein, the INVITE message includes SDP information for media negotiation, and the SDP information includes the IP address and port used by the IP-PBX to receive the media stream.
步骤203，IMS core根据被叫用户的签约信息确认该被叫用户是否签约了彩铃业务。Step 203, the IMS core confirms whether the called user subscribes to the CRBT service according to the subscription information of the called user.
以被叫用户签约了彩铃业务为例，这种情况下，IMS core除了将INVITE消息转发到被叫终端，还根据接收到的INVITE消息进行多媒体协商，以确定播放多媒体彩铃的资源。其中，IMS core可以包括CSCF、MRBT AS、MRS等设备，IMS core接收到INVITE消息后，具体的多媒体协商过程参考现有技术，在此不再赘述。Take the called user subscribed to the CRBT service as an example. In this case, the IMS core not only forwards the INVITE message to the called terminal, but also performs multimedia negotiation according to the received INVITE message to determine the resources for playing multimedia CRBT. The IMS core may include devices such as CSCF, MRBT AS, and MRS. After the IMS core receives the INVITE message, the specific multimedia negotiation process refers to the prior art, which will not be repeated here.
步骤204，被叫终端振铃后，向IMS core返回18x消息。Step 204, after the called terminal rings, returns an 18x message to the IMS core.
步骤205，IMS core向SBC发送18x消息。Step 205, the IMS core sends an 18x message to the SBC.
向SBC返回的18x消息，根据被叫用户是否签约彩铃业务，而有所区别。若步骤203中确定被叫用户签约了彩铃业务，那么在向IP-PBX返回的消息中携带为主叫播放彩铃的SDP信息，该SDP信息包括IMS侧播放彩铃的媒体资源的IP地址和端口号。The 18x message returned to the SBC varies according to whether the called user subscribes to the CRBT service. If it is determined in step 203 that the called user has subscribed to the CRBT service, then the message returned to the IP-PBX carries the SDP information for playing the CRBT for the calling party, and the SDP information includes the IP address and port number of the media resource for playing the CRBT on the IMS side .
步骤206，SBC接收到18x消息之后，将SDP中包含的IMS侧播放IP地址和端口号替换为SBC的IP地址和端口号，并将修改后的18x消息发送给IP-PBX。Step 206, after receiving the 18x message, the SBC replaces the IMS side playback IP address and port number contained in the SDP with the IP address and port number of the SBC, and sends the modified 18x message to the IP-PBX.
步骤207，IP-PBX接收到18x消息后，记录SDP中包含的SBC的IP地址和端口信息，并启动RTP报文检测，检测在预定时间内，本端接收媒体流的IP地址和端口号是否从IMS侧播放媒体流的IP地址和端口号上接收到RTP报文。可以理解的是，对于IP-PBX而言，IMS侧播放媒体流的IP地址和端口号是指接收到的18x消息中包含的SBC的IP地址和端口号。Step 207, after receiving the 18x message, the IP-PBX records the IP address and port information of the SBC contained in the SDP, and starts the RTP packet detection to detect whether the IP address and port number of the media stream received by the local end within a predetermined time. The RTP packet is received from the IP address and port number of the media stream played on the IMS side. It can be understood that, for the IP-PBX, the IP address and port number of the media stream played on the IMS side refer to the IP address and port number of the SBC contained in the received 18x message.
步骤208，如果在预定的时间内，IP-PBX没有检测到上述接收媒体流的IP地址和端口号接收到播放媒体流的IP地址和端口号发送的RTP报文，那么IP-PBX申请本地的数字信号处理(英文：Digital Signal Processing，缩写：DSP)资源，为主叫终端播放本地回铃音。Step 208, if within a predetermined time, the IP-PBX does not detect the above-mentioned IP address and port number for receiving the media stream and receives the RTP message sent by the IP address and port number for playing the media stream, then the IP-PBX applies for a local Digital Signal Processing (English: Digital Signal Processing, abbreviation: DSP) resource, playing the local ringback tone for the calling terminal.
如果在预定的时间内，IP-PBX检测到上述接收媒体流的IP地址和端口号接收到了播放媒体流的IP地址和端口号发送的RTP报文，那么IP-PBX将接收到的媒体流转换成模拟信号发送给主叫终端。这样，主叫终端就可以听到IMS侧提供的多媒体彩铃。If within a predetermined time, the IP-PBX detects that the IP address and port number for receiving the media stream has received the RTP message sent by the IP address and port number for playing the media stream, then the IP-PBX converts the received media stream to It is sent to the calling terminal as an analog signal. In this way, the calling terminal can hear the multimedia CRBT provided by the IMS side.
步骤209，被叫摘机，向IP-PBX发送200OK消息。Step 209, the called party picks up the hook and sends a 200 OK message to the IP-PBX.
步骤210，IP-PBX向被叫终端返回响应ACK消息。
至此，会话建立，主被叫之间可以通话。At this point, the session is established, and the caller and the called party can talk.
可替代地，上述实施例中，如果步骤203中确定被叫用户没有签约彩铃业务，那么在向IP-PBX返回的18x消息中不携带SDP信息。在这种情况下，SBC接收到IP-PBX发送的18x消息时，会将接收到的18x消息转发给IP-PBX。IP-PBX发现接收到的18x消息中没携带SDP信息，因此，IP-PBX会申请本地存储的DSP资源，向主叫终端播放回铃音。具体过程与现有技术无异，在此不再赘述。Alternatively, in the above embodiment, if it is determined in step 203 that the called user does not subscribe to the CRBT service, the 18x message returned to the IP-PBX does not carry the SDP information. In this case, when the SBC receives the 18x message sent by the IP-PBX, it will forward the received 18x message to the IP-PBX. The IP-PBX finds that the received 18x message does not carry the SDP information. Therefore, the IP-PBX will apply for locally stored DSP resources and play the ringback tone to the calling terminal. The specific process is the same as that in the prior art, and will not be repeated here.
可以理解的是，上面步骤中IP-PBX与IMS交互时采用的是SIP协议中的消息，而其中18x消息可以是180消息或183消息。It can be understood that, in the above steps, when the IP-PBX interacts with the IMS, a message in the SIP protocol is used, and the 18x message may be a 180 message or a 183 message.
如图3所示，本发明实施例还提供一种交换装置，包括处理器301，外部交换站302(英文：Foreign Exchange Station，缩写：FXS)，数字信号处理器303(英文：DigitalSignal Processor，缩写：DSP)，网口304，处理器301，数字信号处理器303和网口304之间通过内部总线相连，FXS302与数字信号处理器之间也可以通过内部总线相连。其中，FXS，用于从主叫终端接收呼叫请求，并将所述呼叫请求发送给DSP；数字信号处理器DSP，用于将接收到的呼叫请求转发给处理器，及提供数字信号处理资源；处理器，用于接收为该呼叫分配的本端接收媒体流的IP地址和端口号，记录所述本端接收媒体流的IP地址和端口号，并向IMS发送INVITE消息，在所述INVITE消息中携带所述本端接收媒体流的IP地址和端口号；用于从网口接收IMS返回的18x消息，确定并记录所述18x消息中包括IMS侧播放媒体流的IP地址和端口号；且，处理器还用于确定在预定的时间内，所述本端接收媒体流的IP地址和端口号上是否有接收到从所述IMS侧播放媒体流的IP地址和端口号发送的多媒体报文；当确定没有接收到的时候，向所述的数字信号处理器申请数字信号处理资源，根据申请到的数字信号处理资源为主叫终端播放本地回铃音，而当确定接收到的时候，将接收到的多媒体报文转换成模拟信号发送给主叫终端。As shown in FIG. 3, an embodiment of the present invention further provides an exchange device, including a
在具体的实现中，上述的交换装置，可以是IP用户级交换机IP-PBX，而其中的网口可以为以太网口。可以理解的是，IP-PBX可以通过该网口的不同端口接收到IMS发送的信令或者媒体流的。In a specific implementation, the above-mentioned switching device may be an IP user-level switch IP-PBX, and the network port therein may be an Ethernet port. It can be understood that the IP-PBX can receive the signaling or media stream sent by the IMS through different ports of the network port.
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明实施例所描述的功能，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者通过所述计算机可读存储介质进行传输。所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。Those skilled in the art should realize that, in one or more of the above examples, the functions described in the embodiments of the present invention may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted over a computer-readable storage medium. The computer instructions can be sent from one website site, computer, server, or data center to another website site by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) , computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), among others.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的保护范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the protection scope of the technical solutions of the embodiments of the present invention.
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| CN112188005B (en)* | 2019-07-03 | 2021-11-12 | 中国电信股份有限公司 | Ring back tone playing method and system and internetwork interconnection access control equipment |
| CN111182163B (en)* | 2019-11-25 | 2022-02-18 | 深圳震有科技股份有限公司 | Automatic call test method and device, computer equipment and medium |
| CN112910892B (en)* | 2021-01-29 | 2022-12-20 | Oppo广东移动通信有限公司 | Method and terminal for playing call hold audio and video signals |
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| CN100563283C (en)* | 2005-06-30 | 2009-11-25 | 华为技术有限公司 | Method and system for controlling ring back tone |
| CN101141519B (en)* | 2006-09-08 | 2011-09-14 | 华为技术有限公司 | Method and device to determine calling audio playback |
| CN101448044B (en)* | 2007-11-26 | 2014-02-19 | 中兴通讯股份有限公司 | A method for playing color ring tone without crosstalk based on SIP protocol |
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