CN1295911C - A routing method for IP telephone system - Google Patents

Abstract

The present invention relates to a route selecting method for an IP telephone system. Speech data packets of calling parties and called parties are conveyed among nodes in an IP network; for each called party, address information of each calling party can be corresponding to one node connected with the called party, and the address information is a calling number and/or an IP address of a calling node. When each calling party initiates a call, the IP telephone system performs the following steps: (1) one of the nodes connected with each corresponding called party is determined according to the address information and a called number; (2) an IP address of the node connected with the called party, which is determined in the step (1) is conveyed to the calling node to instruct the calling node to set up a call with the node connected with the called party. Since route search is based on the called number and the address information of the calling party, a plurality of routes from the calling node to the node connected with the called party can be distinguished by the address information of the calling party, and thereby, the present invention realizes flexible route selection.

Description

A Routing Method for IP Telephone System

technical field

The invention relates to IP telephone technology, in particular to a routing selection method for an IP telephone system.

Background technique

Traditional telephony transmits voice information through a circuit switching network and a connection-based circuit method. Modern program-controlled telephones mainly use time-division multiplexing technology to improve circuit utilization, and use each fixed time slot that periodically appears on a physical line as a logic circuit, and assign a fixed logic circuit to each voice channel communication.

The so-called IP phone refers to a new type of telephone system that mainly uses the Internet as the transmission medium. The network sends the data packet to the receiving place; the receiving end connects these voice data in series, and restores the original voice signal after decoding and decompressing, so as to achieve the purpose of transmitting voice through the Internet.

For example, in an IP telephone system based on the ITU (International Telecommunication Union) H.323 standard, in terms of logical function level, the system may include terminals, gateways, gatekeepers and multipoint control units, and both terminals and gateways are regarded as H. .323 nodes, where the terminal is a node device that provides real-time, two-way communication in the IP network; the gateway completes the functions of data transmission format and communication process conversion, and provides the call, signaling and communication between the IP network and the telephone network Transparent transmission; the function of the gatekeeper is to provide call control services to H.323 nodes; the multipoint control unit is used to provide multipoint conference control functions.

The route selection of the packaged voice data packet in the IP network can be realized by the gatekeeper, the gateway or the H.323 terminal. The following describes an example of route selection in the process of an IP phone call with the help of Figure 1. In this example , assuming that the gatekeeper is responsible for implementing the routing function, and both the calling party and the called party are connected to the IP network through the gateway, but the calling party or the called party can also be an H.323 terminal and still use the following route to The selection mode determines the routing of voice packets. As shown in Figure 1, when gateway 11 receives the call that calling party initiates (because receiving the call that calling party initiates, so gateway 11 is equivalent to calling gateway), it first sends call access request message ARQ to gatekeeper , the message includes information such as the IP address of the gateway 11, the calling number and the called number (wherein the first three digits of the called number are 020). The gatekeeper obtains the called number from the access request message ARQ and searches for a matching landing gateway (that is, the gateway connected to the called party) according to the corresponding relationship between the called number and the route stored in it. In this example, when the gateway 11 When gateway 12 and gateway 13 are used as calling gateways as calling gateways, the called number whose first three digits are 010 corresponds to the route numbered 010, and the called number whose first three digits are 010 corresponds to the route numbered 020, that is, If the first three digits of the called number are 010, the destination gateway of the call is gateway 12; if the first three digits of the called number are 020, the destination gateway of the call is gateway 13. Therefore, here, the gatekeeper sends a call response message ACF containing the call signaling address of the gateway 13 and other relevant information to the gateway 11, and the gateway 11 establishes a call connection with the gateway 13 according to the ACF message.

In the above route selection method, for each calling party, there is a certain corresponding relationship between the route and the called number, so the gatekeeper can determine or select the route from the called number according to the corresponding relationship. This route selection method is simple and feasible, but has the disadvantage of inflexible processing method, so it cannot meet the actual needs of users with various types and rich content. For example, suppose there are two calling gateways gw1 and gw2 and two called gateways gw3 and gw4, and both gateways gw3 and gw4 support the route numbered 010. For some reason, gw1 can only establish a call connection with gw3, and gw2 only Can establish call connection with gw4. For this situation where multiple gateways support the same route, the above route selection method cannot distinguish the route with the number 010 but different destination gateways according to the called number, so the destination gateway desired by the calling party cannot be selected.

Contents of the invention

The purpose of the present invention is to provide a routing selection method for an IP telephone system, which can flexibly configure the routing between the calling party and the called party as required when the called party has multiple connected gateways or terminals .

In the routing method for IP telephone system according to the present invention, the calling party and the called party transmit voice data packets in the IP network via the nodes connected respectively, for each called party, each calling party The address information can correspond to a connected node of the called party, and the address information is the calling number and/or the IP address of the calling node. When the calling party initiates a call, the IP telephone system performs the following steps:

(1) Determine a set node connected to the called party according to the correspondence between the address information, the called number and the address information of the calling party and the node connected to the called party; and

(2) Sending the call signaling address of the node connected to the called party determined in step (1) to the calling node to instruct the calling node to establish a call with the node connected to the called party.

In the above route selection method, preferably, for each called party, the address information of each calling party corresponds to one of the connected nodes of the called party in the following manner: the called party of each called party The calling number corresponds to a plurality of transformed called numbers, and each transformed called number is in one-to-one correspondence with the address information of each calling party and corresponds to one of the connected nodes of the called party.

In the above routing method, preferably, the IP telephone system follows the H.323 protocol, and the node is a gateway or a terminal.

As can be seen from above, in the route selection method according to the present invention, the search of the route is not only based on the called number, but also based on the address information of the calling party, so multiple routes from the calling node to the connected node of the called party can be The caller's address information is used to distinguish, which realizes the flexible selection of routes.

Description of drawings

Fig. 1 is a schematic diagram of selecting a route based on a called number in the prior art.

Fig. 2 is a schematic diagram of a preferred embodiment of the route selection method according to the present invention.

Fig. 3 is a schematic diagram of another preferred embodiment of the route selection method according to the present invention.

Fig. 4 is a schematic diagram of another preferred embodiment of the route selection method according to the present invention.

Detailed ways

As mentioned above, for each called party, when the calling party calls, only using the called number cannot effectively distinguish multiple nodes connected to the called party, or in other words, it cannot effectively distinguish the number of nodes connected to the called party from the calling node to the called party. Multiple routes of the connected node, for this reason, also introduce the address information of the calling party in the routing selection method of the present invention, combine the address information of the calling party with the multiple routes of the connected node from the calling node to the called party One of the routes corresponds to it. Apparently, there may be multiple ways of this correspondence, as long as the requirements for flexible routing configuration can be met. Preferably, the address information of the calling party corresponds to one of the multiple routes from the calling node to the node connected to the called party (or one of the nodes connected to the called party) in the following manner : The called number of each called party corresponds to a plurality of transformed called numbers, and each said transformed called number is in one-to-one correspondence with the address information of each calling party and is connected to one of the called parties. corresponding to the node.

It is worth pointing out that in this paper, the meaning of address information refers to one of the following three situations: a) the calling number of the calling party; b) the IP address of the calling node; and c) the calling number of the calling party number and the IP address of the calling node. The calling node is a node connected to the calling party, which is responsible for sending the voice data packets of the calling party to the IP network and receiving the voice data packets sent to the calling party from the IP network.

The preferred embodiments of the present invention are described below with the help of drawings. In the following embodiments, it is assumed that the IP telephone system complies with the H.323 protocol, and the nodes are gateways or terminals.

first embodiment

In the first embodiment, for each called number, the called gateway is selected according to the IP address of the calling gateway, so that each calling gateway is configured with a corresponding called gateway. Assume that when the gateway 21 with the IP address of 1.1.1.1 is used as the calling gateway, the calling party can reach a certain called party via gateways 23 and 24, and the routes are all 010; when the gateway 22 with the IP address as 1.1.1.2 acts as When calling the gateway, the calling party can also reach the called party via gateways 23 and 24, and the routes are also 010. In order to make the calling gateway correspond to one of the gateways connected to the called party, in this embodiment, the called number of the called party is formed as a transformation by adding 2 prefix symbols 1# or 2# at the beginning The corresponding relationship between the called number and the IP addresses of calling gateways 21 and 22 is as follows:

IP address＝1.1.1.1—→1#+called number

IP address＝1.1.1.2—→2#+called number

At the same time, the converted called number corresponds to one of the connected gateways of the called party in the following manner: the converted called number "1#+called number" corresponds to gateway 23, and the converted called number "2 #+called number" corresponds to gateway 24, correspondingly, the routes of called gateways 23 and 24 should also be changed accordingly, that is, the route of gateway 23 changes from 010 to 1#010, and the route of gateway 24 changes from 010 to 2 #010. In this way, the call from the calling gateway 21 should be routed to the called gateway 23 , and the call from the gateway 22 should be routed to the called gateway 24 . For other called numbers, the setting of the corresponding relationship between the calling gateway and the gateway connected to the called party can also be completed in the manner of this embodiment.

When the gateway 21 sends the call access request message ARQ to the gatekeeper, the called number included is assumed to be 01067899998, then the gatekeeper converts the called number to 1#01067899998 according to the above-mentioned correspondence, and then determines the route to be 1# by routing lookup 010, the called gateway is the gateway 23, and returns the call response message ACF including the calling signaling address of the gateway 23 to the gateway 21, so that the gateway 21 starts to establish a call connection with the gateway 23. When the gateway 22 is used as the calling gateway, it also completes the routing selection in the same manner, so that it establishes a call connection with the gateway 24 .

second embodiment

In the second embodiment, for each called number, the gateway connected to the called party is selected according to the calling number, so that each calling number is configured with a corresponding called gateway. Assume that the calling party whose phone number starts with 021 or 020 can reach a called party via gateways 33 and 34 through the H.323 node as the calling node, and the routes are both 010. In order to make each calling party correspond to one of the gateways connected to the called party, in this embodiment, the called number of the called party is formed by adding a 3-digit prefix symbol 21# or 20# at the beginning After conversion, the corresponding relationship between the called number and the calling number is as follows:

The calling number starting with 020—→20#+called number

The calling number starting with 021—→21#+called number

At the same time, the converted called number corresponds to one of the connected gateways of the called party in the following manner: the converted called number "21#+called number" corresponds to gateway 33, and the converted called number "20# #+called number" corresponds to gateway 34, correspondingly, the routes of called gateways 33 and 34 should be changed accordingly, that is, the route of gateway 33 is changed from 010 to 21#010, and the route of gateway 34 is changed from 010 to 20 #010. In this way, calls to the 021 office are routed to the called gateway 33 , and calls to the 020 office are routed to the called gateway 34 . For other called numbers, the setting of the corresponding relationship between the calling number and the gateway connected to the called party can also be completed in the manner of this embodiment.

When the calling party is the 021 office, the call sends a call access request message ARQ to the gatekeeper through the H.323 node, and the called number contained is assumed to be 02776236288, and the gatekeeper changes the called number to 21 according to the above correspondence #02776236288, then determine that the route is 21#010 through routing search, the called gateway is gateway 33, and return the call response message ACF containing the calling signaling address of gateway 33 to the H.323 node, so that the H.323 node starts to communicate with The gateway 33 establishes a call connection. When the calling party calls the above-mentioned called party for the 020 office, the routing selection is also completed in the same way, so that it establishes a conversation with the gateway 34 .

third embodiment

In the third embodiment, for each called number, the gateway connected to the called party is selected according to the calling number and the IP address of the calling gateway, so that each combination of the calling number and the IP address of the calling gateway corresponds to a called number. called gateway. Assume that the calling party whose phone number starts with 021xxx or 020xxx can use the gateway 41 whose IP address is 1.1.1.1 as the calling gateway to reach a certain called party via gateways 43 and 44, and the routes are all 010. Similarly, the phone number starts with The calling party beginning with 027xxx can reach the called party via gateways 43 and 44 with the gateway 42 whose IP address is 1.1.1.2 as the calling gateway, and the routes are both 010. In order to make the calling party correspond to one of the gateways connected to the called party, in this embodiment, the called number of the called party is converted by sequentially adding two types of prefix symbols representing the office route and IP address at the beginning After the called number, if the IP address prefix symbol is added first and then the office prefix symbol is added, the corresponding relationship with the calling number is as follows:

The calling number starting with 021 and using the gateway with IP address 1.1.1.1 as the calling gateway—→211#010

The calling number starting with 020 and using the gateway with IP address 1.1.1.1 as the calling gateway—→201#010

The calling number starting with 027 and using the gateway with IP address 1.1.1.2 as the calling gateway—→272#010

If the office prefix symbol is added first and then the IP address prefix symbol is added, the corresponding relationship with the calling number is as follows:

The calling number starting with 021 and using the gateway with IP address 1.1.1.1 as the calling gateway—→121#010

The calling number starting with 020 and using the gateway with IP address 1.1.1.1 as the calling gateway—→120#010

The calling number starting with 027 and using the gateway with IP address 1.1.1.2 as the calling gateway—→227#010

At the same time, the converted called number corresponds to one of the connected gateways of the called party in the following manner (take the converted called number formed by first adding the IP address prefix symbol and then adding the office prefix symbol as an example): The converted called number "211#+called number" corresponds to gateway 43, the converted called number "201#+ called number" corresponds to gateway 43, and the converted called number "272#+ called number" corresponds to gateway 44 Correspondingly, the routes of the called gateways 43 and 44 also need to be changed accordingly, that is, the route of the gateway 43 is changed from 010 to 211#010 and 201#010, and the route of the gateway 44 is changed from 010 to 272#010. In this way, calls to the 021 and 020 offices and gateway 41 as the calling gateway are routed to the called gateway 43 , and calls to the 027 office and the gateway 42 is the calling gateway are routed to the called gateway 44 . For other called numbers, the setting of the corresponding relationship between the combination of the calling number and the calling gateway and the gateway connected to the called party can also be completed in the manner of this embodiment.

When the calling party with the 020 or 021 office direction initiates a call through the gateway 41, the calling gateway 41 sends a call access request message ARQ to the gatekeeper, and the called number contained is assumed to be 02876236288, then the gatekeeper Change the called number to 20#02876236288 or 21#02876236288, then determine the route as 201#010 or 211#010 through routing search, the called gateway is gateway 43, and send the call response message ACF containing the calling signaling address of gateway 43 Return to gateway 41, like this, gateway 41 starts to establish call connection with gateway 33. When the calling party with the 027 office direction calls the called party through the gateway 42, the routing selection is also completed in the same way, so that it establishes a conversation with the gateway 44.

In the above-mentioned embodiment, the route selection function is realized by the gatekeeper, and logically speaking, the gatekeeper is separated from the H.323 node equipment, but in the present invention, the function of the gatekeeper can be fully integrated into the terminal, gateway or multi-point control unit and other physical devices, this has no substantial impact on the realization of the method of the present invention.

Claims (7)

1. a kind of routing selection method that is used for IP telephone system, calling party and called party transmit voice data packet in IP network through the node that is connected respectively, and the node that calling party is connected is calling node, it is characterized in that , for each called party, the address information of each calling party may correspond to a connected node of the called party, and the address information is the calling number and/or the IP address of the calling node, when the calling party When a party initiates a call, the IP telephony system performs the following steps: (1) Determine a set node connected to the called party according to the correspondence between the address information, the called number and the address information of the calling party and the node connected to the called party; and (2) Sending the call signaling address of the node connected to the called party determined in step (1) to the calling node to instruct the calling node to establish a call with the node connected to the called party. 2. The route selection method as claimed in claim 1, wherein, for each called party, the address information of each calling party corresponds to one of the connected nodes of the called party in the following manner: each The called number of the called party corresponds to a plurality of converted called numbers, each of which is in one-to-one correspondence with the address information of each calling party and corresponds to one of the connected nodes of the called party. 3. The routing method according to claim 2, wherein the IP telephone system follows the H.323 protocol, and the node is a gateway or an H.323 terminal. 4. routing method as claimed in claim 3 is characterized in that, IP telephone system comprises gatekeeper, and described address information is the IP address of calling node, and described step (1) comprises the following steps: (1a) the calling node sends an access request message comprising the called number to the gatekeeper; and (1b) The gatekeeper determines the converted called number according to the IP address of the calling node and determines a set called party connected node according to the converted called number. 5. routing method as claimed in claim 3 is characterized in that, IP telephone system comprises gatekeeper, and described address information is the calling number of calling party, and described step (1) comprises the following steps: (1a) the calling node sends an access request message comprising the called number to the gatekeeper; and (1b) The gatekeeper determines the converted called number according to the calling number and determines a set node connected to the called party according to the converted called number. 6. routing method as claimed in claim 3 is characterized in that, IP telephone system comprises gatekeeper, and described address information is the calling number of calling party and the IP address of calling node, and described step (1 ) includes the following steps: (1a) the calling node sends an access request message comprising the called number to the gatekeeper; and (1b) The gatekeeper determines the converted called number according to the calling number of the calling party and the IP address of the connected node, and determines a set connected node of the called party according to the converted called number. 7. The routing method according to any one of claims 4 to 6, characterized in that, in the step (2), the gatekeeper sends a call response message to the calling node to transmit The call signaling address of the node.

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