CN1157924C - Routing selection method for IP telephone continued back-up - Google Patents

Abstract

The present invention relates to a path selection method for the connection backup of an IP telephone. In the path selection method for the connection backup of an IP telephone, the call of the IP telephone is not released when a call link can not be established because of the faults of an IP network. According to different conditions of the faults of the IP network in a call connection process, a static-state IP address of a VoIP type configuration item of the number of the IP telephone is respectively used as the connection backup of a dynamic-state IP address of an RAS type configuration item of the number of the IP telephone, or a public-telephone switched network PSTN is used as a backup network of a POTS type telephone number of the IP telephone; therefore, the connection of the conversation link can become successful. Therefore, the call link with an opposite end router can be established by the two backup methods when the faults of the IP network appear, the access success ratio of the IP telephone is enhanced, and the satisfaction degree of a user for the IP telephone can be increased. The path selection method for the connection backup of an IP telephone does not add any hardware facility, and the path selection method for the connection backup of an IP telephone has the advantages of simple measure and easy operation and also has good application prospect.

Description

A Path Selection Method for IP Telephone Connection Backup

Field

The present invention relates to a kind of path selection method for IP phone connection backup, to be precise, relates to a kind of connection backup using static IP routing as dynamic IP routing, and using the public telephone network as the backup network of IP phone to make the call link Path selection method for successful continuation. It belongs to the technical field of IP telephony.

Background technique

With the rapid development of IP telephony, IP telephony/fax technology has become a hot spot since the development of Internet. IP phone/fax technology has a great impact on the existing public switched telephone network because of its narrow bandwidth, low cost, and complete functions. At the same time, IP phone also has many shortcomings. For example, the existing public switched telephone network (PSTN) provides a fixed channel of 64Kbps for each call, and this channel is always occupied during the conversation, so the transmitted voice quality is better. However, the Internet does not guarantee bandwidth. Due to the shortage of network resources, sometimes the call link required by the user cannot be established, the voice delay is increased, and the voice data is lost; moreover, the traditional IP network cannot guarantee real-time voice. The quality of the business makes the call quality of the IP telephone unable to compare with the existing telephone. This is because the Internet is a combination of different networks and different service providers, any failure of network equipment and resource constraints will make voice calls unable to be established normally. At present, after the user dials out the IP call, as long as the gatekeeper (GK, Gatekeeper) server does not respond, or the IP network breaks down, the call connection cannot be established. It is precisely because of the uncertainty of the composition of the IP network that the serious disadvantages such as the low call rate and poor service quality of the IP phone have been caused, which have affected the popularization and promotion of the use of the IP phone.

Contents of the invention

The purpose of the present invention is to provide a kind of path selection method that connects backup for IP phone, this method adopts brand-new path selection strategy, when gatekeeper (GK, Gatekeeper) server breaks down, the static IP route that configures in the router is used as slave The backup of the dynamic IP route returned by the gatekeeper establishes a call link with the other party; or when the IP network between the calling and called routers fails and cannot be connected normally, a call link is established with the other party through the public switched telephone network PSTN. In this way, it is ensured that in the case of network failure, the respective advantages of traditional telephone and IP telephone technology are fully utilized, and the static routing of IP telephone is used as the connection backup of its dynamic routing, and the public switched telephone network PSTN is used as a backup network to effectively improve Quality of service for IP telephony.

The purpose of the present invention is achieved like this: a kind of path selection method for IP phone connection backup, is characterized in that:

(1) When the IP phone fails to establish a call link during the call connection process, determine the type of network failure;

(2) According to different situations of network failures, select the static IP address of the VoIP (Voice Over IP) type configuration item of the IP phone number as its registration, authentication and status RAS (Registration, Admission and Status) type configuration item The connection backup of the dynamic IP address, or use the public switched telephone network PSTN as the backup network of its ordinary telephone service POTS (Plain Old Telephone Service) type telephone number, so that the call link can be successfully connected.

The IP network failure situation that occurs in the call connection process includes: After the voice router receives the IP phone call input by the calling user, it finds that the called number is in the configuration item of registration, authentication and status RAS type , Send a request to the gatekeeper GK, the gatekeeper GK fails, and does not respond to the request sent by the router to obtain a dynamic IP address.

The IP network failure situation that occurs in the call connection process includes: After the voice router receives the IP phone call input by the calling user, it finds that the called number is in the configuration item of registration, authentication and status RAS type , send a request to the gatekeeper GK, and the gatekeeper GK responds, but the call link still cannot be established with the opposite end gateway according to the opposite end dynamic IP address returned by the gate keeper GK.

The IP network failure situation that occurs in the call connection process includes: when the voice router uses the registration, authentication and status RAS type to establish a call link without success and continues to search for the called number, it is found that it is in the Internet phone In the configuration item of VoIP type, but the call link cannot be established with the peer gateway according to the specified static IP address.

The static IP address of described selection IP phone is used as the backup of its dynamic IP address and refers to: after voice router receives the IP phone call of calling user's input, does not find this IP phone in the configuration item of registration, authentication and status RAS type or find the number in the configuration items of the registration, authentication and status RAS type, and send a request to the gatekeeper GK, and the gatekeeper GK fails and does not respond to the request sent by the router to obtain a dynamic IP address; or When the gatekeeper GK answers, but the peer dynamic IP address returned by the gatekeeper GK still fails to establish a connection with the peer gateway; firstly, do not release the IP phone call, and then continue to check whether the called phone number belongs to the Internet phone VoIP In the configuration item of the VoIP type, if the called phone number is found in the configuration item of the VoIP type of Internet phone, the process of establishing a call link with the called party through the specified static IP address to make the call connection successful.

The described backup network of selecting the public switched telephone network PSTN as the Internet telephone POTS type telephone number of the IP telephone refers to: when the voice router uses the registration, authentication and state RAS type and the Internet telephone VoIP type to establish the operation of the call link, there is no When successful, firstly do not release the IP phone call, and then continue to check whether the called phone number is in the configuration item of the ordinary telephone service POTS type, if the called phone number is found in the configuration item of the ordinary phone service POTS type , the process of establishing a call link with the called party through the public switched telephone network PSTN to make the call connection successful.

The method includes the following specific steps:

(1) After the voice router receives the IP phone call input by the calling user, it first checks whether it is in the configuration item of the registration, authentication and status RAS type according to the called number; if the registration, authentication and status of the called number are found RAS type configuration item, the router sends a request to the gatekeeper GK, and the gatekeeper GK returns the dynamic IP address of the peer gateway corresponding to the called number to the router, and the router establishes a connection with the peer gateway based on the dynamic IP address. Carry out normal speech processing flow;

(2) If the registration, authentication and status RAS configuration items of the called number are not found, or the gatekeeper GK fails, it does not respond to the request for obtaining a dynamic IP address sent by the router; or the gatekeeper GK responds, but according to When the opposite end dynamic IP address returned by the gatekeeper GK still fails to establish a connection with the opposite end gateway, the IP telephone call is not released at first, and then continues to search whether the called number is in the configuration item of the corresponding Internet telephone VoIP type; If there is the called number in the Internet phone VoIP type configuration item, establish a connection with the peer gateway according to the specified static IP address, and perform normal voice processing;

(3) If the connection with the peer gateway fails according to the specified static IP address, the router will not release the IP phone call at first, and then continue to check whether the called number is in the configuration item of the corresponding ordinary telephone service POTS type If the called number has configuration items of the POTS type for ordinary telephone services, it will directly connect to the opposite end through the local exchange and the public switched telephone network PSTN, and perform normal voice processing procedures;

(4) If no common telephone service POTS type configuration item corresponding to the called number is found, the call fails.

The feature of the present invention is to provide a routing selection method of IP telephone link, which is an important improvement to the traditional connection process of IP telephone link. The order of searching numbers in the existing IP phone connection process is: RAS→VoIP→POTS, that is, after the configuration item of the RAS type is not found, the configuration item of the VoIP type is searched, and the configuration item of the VoIP type cannot be found. After that, go to the configuration item of POTS type. However, in the traditional connection process, once the network fails, the link will be disconnected immediately, and the subsequent configuration items will not be searched. IP telephony usually uses the Internet composed of various networks to form a call link, and the probability of network failure is relatively high. Therefore, it is natural that people generally feel that the connection rate of IP phones is low, that is, the call loss rate is high. The method of the present invention does not change the selection order of the IP telephone link; its improvement is: when the IP network breaks down and the call link cannot be established, at first the IP telephone call is not released, and then the call is continued according to the occurrence of the call. In the different situations of the IP network failure in the process, the static IP address of the VoIP type configuration item of the IP phone number is selected as the continuous backup of the dynamic IP address of the RAS type configuration item, or the public switched telephone network PSTN is selected as its POTS The backup network of type phone numbers, so that the call link can be successfully connected. In this way, it is ensured that in the case of IP network failure, the respective advantages of traditional telephone and IP telephone technology are fully utilized, by using the static IP address routing of IP telephone as the connection backup of its dynamic IP address routing, and using the public switched telephone network PSTN as Its POTS-type telephone number backup network effectively solves the service quality problem of low IP telephone connection rate. Moreover, the method utilizes the hardware itself of the voice router and the software characteristics of the operating system to realize the selective backup function of the call link on the voice router, without adding any hardware facilities, and guarantees the provision of basic call functions. In addition, this method is relatively simple and easy to implement technically, and there is no need to add new commands. The user only needs to add the called phone number to be backed up into configuration items of different types (RAS type, VoIP type, POTS type), and the When the IP network fails, the above two backup methods can be used to establish a call link with the peer router to improve the connection rate of the IP phone, which will undoubtedly increase the user's satisfaction with the IP phone. Therefore, the present invention has good application prospects.

Description of drawings

FIG. 1 is a schematic diagram of a basic network system structure of an IP phone.

Fig. 2 is a flow diagram of the present invention using the static IP routing as the connection backup of the dynamic IP routing, and using the public telephone network as the backup network of the IP phone to make the call link connection succeed.

Detailed ways

Referring to the schematic diagram of the basic network system structure of IP telephone shown in Figure 1, this is a centralized IP telephone network system composition, including: a gatekeeper server (GK Sever) for unified management, multiple IP network connection The routers (Routers, shown as two in the figure) and multiple switches (shown as two in the figure) connected to each router and the public switched telephone network PSTN.

Generally, there are three types of phone numbers configured on voice routers: 1. POTS type, that is, a local number; 2. VoIP type, which selects a route by specifying the static IP address of the called number; 3. RAS type, which communicates with the gatekeeper The GK interacts to determine the dynamic IP address of the peer gateway to select a route. The dynamic address mentioned here means: when the gatekeeper GK receives the call request sent by the calling gateway, it returns the IP address of the called gateway sent to the calling gateway according to the called phone number in the request. The static address refers to: the IP address of the called gateway at the opposite end obtained by the calling gateway by searching the VoIP configuration items set by it. Because this IP address is configured in the VoIP configuration item of the calling gateway and is not obtained from the gatekeeper GK, it is called a static address.

The problem to be solved by the present invention is: when the calling user A dials an IP phone to the called user B and the router searches for the called number of the RAS type, if the gatekeeper GK or the network fails, etc., the connection initiated by the router If there is no response to the request, the router will not release the call at first, and then establish a call with the other party through the new routing strategy, that is, the static IP address of VoIP type configured in the router will be used as the backup of the dynamic IP address returned from the gatekeeper GK or when the IP network between the calling and called gateways breaks down, and the call link cannot be established by adopting dynamic and static IP addresses, the public switched telephone network PSTN is used as a backup network to establish a connection with the called user B, and then you can Ensure the successful connection of this call.

The present invention is a backup path selection method for IP telephone connection. When the IP network breaks down and the call link cannot be established, the call is not released at first, and then according to the IP network in the call connection process, In different cases of failure, choose the static IP address of the VoIP type configuration item of the IP phone number as the connection backup of the dynamic IP address of the RAS type configuration item, or use the public switched telephone network PSTN as the backup network of the POTS type phone number , so that the call link is successfully connected.

The situation that the described IP network breaks down and the call cannot be established includes multiple types: after the voice router receives the IP phone call input by the calling user, it finds that the called number is in the configuration item of the RAS type, and reports to the gatekeeper When the GK sends out the request, the gatekeeper GK fails and does not respond to the request sent by the router to obtain a dynamic IP address; or the gatekeeper GK responds, but still cannot establish a connection with the peer gateway according to the peer IP address returned by the gatekeeper GK. And the voice router continues to find that the called number is in the configuration item of the corresponding VoIP type, and the connection with the peer gateway cannot be established according to the specified static IP address.

The present invention improves the path selection method of the prior art: after the voice router receives the IP phone call input by the calling user, when the number is not found in the configuration item of the RAS type; or in the configuration item of the RAS type Find the number and send a request to the gatekeeper GK, and the gatekeeper GK fails and does not respond to the request sent by the router to obtain a dynamic IP address; or the gatekeeper GK responds, but the peer dynamic IP address returned by the gatekeeper GK When still unable to establish a connection with the peer gateway; firstly do not release the IP phone call, and then continue to check whether the called phone number is in the configuration item of the VoIP type. If it can be found, use the specified static IP address to contact the called call to establish a connection so that the call is successfully connected. In addition, when the voice router fails to establish a call link using the RAS type or the VoIP type, it will not release the IP phone call first, and then continue to check whether the called phone number is in the configuration item belonging to the POTS type. If there is, then establish a connection with the called party through the public switched telephone network PSTN to make this conversation succeed.

Referring to Fig. 2, the path selection method of the present invention includes the following specific steps:

(1) After the voice router receives the IP phone call input by the calling user, it first checks whether it is in the configuration item of RAS type according to the called number; if the RAS type configuration item of the called number is found, the router sends GK sends a request, and the gatekeeper GK returns the dynamic IP address of the peer gateway corresponding to the called number to the router, and the router establishes a connection with the peer gateway according to the dynamic IP address, and performs normal voice processing;

(2) If the RAS configuration item of the called number is not found, or the gatekeeper GK fails, it does not respond to the request sent by the router to obtain a dynamic IP address; or the gatekeeper GK responds, but according to the When the dynamic IP address of the opposite end still cannot establish a connection with the opposite end gateway, first do not release the IP phone call, and then continue to check whether the called number is in the corresponding VoIP type configuration item; if so, according to the specified The static IP address establishes a connection with the peer gateway for normal voice processing;

(3) If the connection with the peer gateway fails according to the specified static IP address, the router will not release the IP phone call at first, and then continue to search whether the called number is in the corresponding POTS type configuration item; if If the called number has configuration items of POTS type, it will be directly connected to the opposite end through the local exchange and the public switched telephone network PSTN, and the normal voice processing process will be carried out;

(4) If no POTS type configuration item corresponding to the called number is found, the call fails.

The routing selection method of the present invention has been tested and implemented on a router equipped with a voice single board developed by the applicant, and the program software of the routing selection method is set on the main board side of the voice router. The result of the test is successful, and the purpose of the invention has been realized.

Claims (7)

1, a kind of for IP phone continue the backup routing resource, it is characterized in that:

(1) when IP phone can't be set up call link in the call proceeding process, judges the fault type of network;

(2) according to the different situations of network failure, the static ip address of Internet Protocol telephone VoIP type configuration item of selecting this IP phone number respectively for use is as the backup that continues of the dynamic IP addressing of its registration, authentication and state RAS type configuration item, perhaps select the backup network of public switched telephone network (PSTN) PSTN for use, talking link is continued successfully as its plain old telephone service POTS type telephone number.

2, according to claim 1 for IP phone continue the backup routing resource, it is characterized in that: the described IP network failure condition that occurs in the call proceeding process includes: receive the IP phone calling of calling subscriber's input at voice router after, find this called number in the configuration item of registration, authentication and state RAS type, GK sends request to the gatekeeper, gatekeeper GK breaks down, and the request of obtaining dynamic IP addressing that router sends is not responded.

3, according to claim 1 for IP phone continue the backup routing resource, it is characterized in that: the described IP network failure condition that occurs in the call proceeding process includes: receive the IP phone calling of calling subscriber's input at voice router after, find this called number in the configuration item of registration, authentication and state RAS type, GK sends request to the gatekeeper, gatekeeper GK replys, but still can't set up call link according to opposite end dynamic IP addressing and opposite end gateway that gatekeeper GK returns.

4, according to claim 1 for IP phone continue the backup routing resource, it is characterized in that: the described IP network failure condition that occurs in the call proceeding process includes: when voice router uses not success and when not continuing to search this called number of operation that registration, authentication and state RAS type set up talking link, find it in the configuration item of Internet Protocol telephone VoIP type, but do not have to set up call link according to the static ip address and the opposite end gateway of appointment.

5, according to claim 1 or 2 or 3 described for IP phone continue the backup routing resource, it is characterized in that: the described static ip address of selecting IP phone for use is meant as the backup of its dynamic IP addressing: after the IP phone that voice router receives calling subscriber's input is called out, when not finding this number in the configuration item of registration, authentication and state RAS type; Perhaps find this number in the configuration item of registration, authentication and state RAS type, and GK sends request to the gatekeeper, gatekeeper GK breaks down, when the request of obtaining dynamic IP addressing of router transmission is not responded; Perhaps gatekeeper GK replys, but still can't connect with the opposite end gateway according to the opposite end dynamic IP addressing that gatekeeper GK returns the time; At first not discharging this IP phone calls out, continue to search this called phone number then whether in the configuration item that belongs to Internet Protocol telephone VoIP type, if in the configuration item of Internet Protocol telephone VoIP type, find this called phone number, the static ip address by appointment and calledly set up the process that call link makes this talking connection success then.

6, according to claim 1 or 2 or 3 or 4 described for IP phone continue the backup routing resource, it is characterized in that: the described public switched telephone network (PSTN) PSTN that selects for use is meant as the backup network of the Internet Protocol telephone POTS type telephone number of this IP phone: when voice router uses registration, the operation that authentication and state RAS type and Internet Protocol telephone VoIP type are set up talking link does not all have when successful, at first not discharging this IP phone calls out, continue to search this called phone number then whether in the configuration item that belongs to plain old telephone service POTS type, if in the configuration item of plain old telephone service POTS type, find this called phone number, then by public switched telephone network (PSTN) PSTN and calledly set up the process that call link makes this talking connection success.

7, according to claim 1 for IP phone continue the backup routing resource, it is characterized in that: this method includes following concrete steps:

(1) after the voice router IP phone that receives calling subscriber input is called out, at first searches it whether in the configuration item of registration, authentication and state RAS type according to called number; If find registration, authentication and the state RAS type configuration item of this called number, this router GK to the gatekeeper sends request, gatekeeper GK will be corresponding with this called number the dynamic IP addressing of opposite end gateway return to router, this router connects according to this dynamic IP addressing and opposite end gateway, carries out normal speech processes flow process;

(2) if do not find the configuration item of registration, authentication and the state RAS type of this called number, perhaps gatekeeper GK breaks down, and the request of obtaining dynamic IP addressing that router sends is not responded; Perhaps gatekeeper GK replys, but in the time of still can't connecting according to the opposite end dynamic IP addressing that gatekeeper GK returns with the opposite end gateway, at first do not discharge this IP phone and call out, continue to search this called number then whether in the configuration item of corresponding Internet Protocol telephone VoIP type; If in Internet Protocol telephone VoIP type configuration item this called number is arranged, then static ip address and the opposite end gateway according to appointment connects, and carries out normal speech processes flow process;

(3) if according to the connection failure of the static ip address and the opposite end gateway of appointment, then this router does not at first discharge this IP phone and calls out, and continues to search this called number then whether in the configuration item of corresponding plain old telephone service POTS type; If this called number has the configuration item of plain old telephone service POTS type, then directly continue by local switch and public switched telephone network (PSTN) PSTN and opposite end, carry out normal speech processes flow process;

(4) if do not find and the corresponding plain old telephone service POTS of called number type configuration item, this call failure.