Detection method of analog trunk line

Abstract

The invention relates to a communication relaying technique, in particular to a detection method for an IP audio gateway analog trunk line. The invention discloses a method for detecting the state of a telephone line and without influence on the call flow, and aims to improve the call success rate of analog trunk. The invention adopts the technical proposal that the detection method for the analog trunk line comprises the following steps: a, an analog trunk interface initiates a call after off-hook; b, the analog trunk interface is used for detecting the loop current, and if the loop current is detected, whether the analog trunk circuit for connecting the analog trunk interface is available or not is judged, and then the normal call flow is carried out; and c, if no loop current is detected, the steps are repeated to the other analog trunk interface. The invention can be used in equipment using the analog trunk line, and improve the access success rate of the analog trunk line.

Description

Technical field [0001] The present invention relates to communication relay technology, in particular to a detection method of an analog trunk line of an IP voice gateway. Background technique [0002] In equipment that uses analog trunk lines, such as telephone program-controlled exchanges (PBX) and voice gateways, there may be analog trunk interfaces, which are generally also called foreign exchange office (FXO) interfaces. This analog trunk interface uses ordinary user telephone lines as trunk lines. When an external call comes in or an internal call needs to make an outgoing call through this interface, the analog trunk interface will go off-hook, and then the voice will be transmitted through the trunk line. When the line fails, such as short circuit or open circuit, the call will not be successful, especially when the same device integrates multiple analog trunk interfaces, there is still the problem of interface gating, once a certain one or more analog trunk interfaces Wh...

AI Technical Summary

Problems solved by technology

There is usually such a problem in the existing detection method: when there is a call detection line, because the state of the telephone line can only be detected after the off-hook, generally the line is found to be abnormal after the off-hook, and the call can only be removed and then the interface is re-selected. Call flow has some impact and also increases call setup time

In addition, when the loop current is detected when idle, the PBX will respond to the off-hook action after off-hook, and the PBX will think that the user has off-hook, which will cause some abnormalities, such as finding that a certain interface is constantly off-hook and on-hook but there is no call process. Then it is judged that the line is a bad line, or a call is connected by mistake

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