Chapter 55 Configuring a VoIP Network

Understanding How a VoIP Network Works

Table 55-1 24-Port FXS Analog Interface Module Features (continued)

Digital Signal Processing Per Port

Line echo cancellation (32 ms)

Impedance (600 ohms)

Programmable analog gain, signaling timers

Fax pass-through

SPAN2 or port mirroring support

FXS Interface Features

Address signaling formats: In-band DTMF

Signaling formats: Loop start

Ringing tone: Programmable

Ringing voltage: Programmable, based on country

Ringing frequency: Programmable, based on country

Distance: 500-ohms maximum loop

1.DTMF = dual tone multifrequency

2.SPAN = Switched Port Analyzer

Analog Trunk Gateway

The Cisco access analog trunk gateways allow the IP PBX to connect to the PSTN or PBX. The gateway supports up to eight trunks to the PSTN and appears like a phone to the trunk lines coming from the PSTN. Using this gateway, the IP PBX places an IP call through the PSTN. Similar to the analog station gateway, the analog trunk gateway provides line echo cancellation and dual tone multifrequency (DTMF) tone generation and detection. The analog trunk gateway does not provide the ring voltage as it is not connected to the POTS end devices such as the POTS phones or fax machines. The analog trunk gateway requires an IP address, is registered with Cisco CallManager in its domain, and is managed by Cisco CallManager.

To configure the analog trunk gateways, refer to the documentation that shipped with the gateway.

Digital Trunk Gateway

The Catalyst 6500 series 8-port T1/E1 PSTN interface module can support both digital T1/E1 connectivity to the PSTN or transcoding and conferencing. The module requires an IP address, is registered with Cisco CallManager in its domain, and is managed by Cisco CallManager.

The module software is downloaded from a TFTP server. Depending upon which software you download, the ports can serve as the T1/E1 interfaces or the ports support transcoding and conferencing. The transcoding and conferencing functions are mutually exclusive. For every transcoding port in use, one less conferencing port is available and vice versa.

To configure the 8-port T1/E1 PSTN interfaces, see the “Configuring VoIP on a Switch” section on page 55-10. The module features are listed in Table 55-2.

Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7

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OL-8978-02

 

 

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Cisco Systems OL-8978-02 manual Analog Trunk Gateway, Digital Trunk Gateway, FXS Interface Features, 55-6

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