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Understanding SRX Series Integrated Convergence Services Media Gateway Analog Stations Configuration
This topic explains analog stations.
The SRX Series media gateway (SRX Series MGW) supports Foreign Exchange Station (FXS) interfaces for connecting analog phones and faxes. Users of analog telephones (or faxes) can make calls only if at least the required station information is configured for the phone. The FXS interface, the unit (the analog telephone or the fax machine), and the information used to configure them comprise an analog station.
The SRX Series MGW intercedes on behalf of analog phones and faxes, converting analog signals for calls from them to digital ones to send over the IP WAN to the peer call server. The peer call server applies call services to the calls and routes them. If the calls are intended for an analog phone or fax at the branch, the peer call server routes the call to the SRX Series MGW, and it forwards it to the analog station after having converted the signal from digital to analog.
Table 5 shows parameters used to configure an analog station.
Table 5: Analog Station Configuration Information
Configuration Parameter | Description |
|---|---|
Required information. | These parameters include the station name, extension, and station type. |
FXS interface name. | The name of the FXS interface for the station. |
Caller ID user information, such as the station telephone number and the user’s name. | Caller ID information is routed to all called parties, depending on the state of the caller ID transmit parameter (caller-id-transmit), which is specified in a template. Caller ID transmit is enabled by default. Note: If caller-id-transmit is enabled and no caller ID information is configured for the station, the station’s extension number is routed to all called parties. |
Class of restriction information. | This information defines the types of calls that can be made from the station, for example, local calls and long-distance calls. By default, intra-branch and emergency calls are allowed. |
Authentication ID and password. | This information allows the station to authenticate to the SRX Series survivable call server (SRX Series SCS), when it is in control because the peer call server is unreachable. |
Direct inward dialing (DID) number and line. | This information specifies the DID number that external users can dial to reach the extension directly, bypassing an operator. It also specifies the line to be used for DID. |
Voice activity detection (VAD) and comfort noise generation. | VAD and comfort noise generation pertain to the quality of the transmission. VAD detects the presence of speech in an audio signal and sends only audio packets. VAD can reduce bandwidth and computational costs, but because people are uncomfortable with total silence during phone conversations when VAD is enabled and no one is speaking, comfort noise generation is often used with VAD to provide familiar background sound. VAD and comfort noise generation are enabled by default. You can disable them in a template and apply the template to a station. |
Caller ID transmission (caller-id-transmit). | This parameter specifies whether caller ID information configured for the station is transmitted on outgoing calls. You can disable caller ID transmission to ensure that no information is transmitted. Note: If the caller-id-transmit parameter is enabled and no caller ID information is configured for the station, then the station’s extension number is routed to all called parties. |
