Chapter 55 Configuring a VoIP Network

Understanding How a VoIP Network Works

Table 55-2 8-Port T1/E1 PSTN Interface Module Features

Digital Signal Processing Per T1/E1 Port

G.711 to G.723 and G.729a transcoding (maximum of 8 x 32 channels of transcoding)

Conference bridging, meet-me, and ad-hoc conference modes (maximum of 8 x 16 channels of conferencing)

Comfort noise generation

Fax pass-through

Silence suppression, voice activity detection

Line echo cancellation

Common channel signaling

For T1: 23 DS0 channels for voice traffic; 24th channel is used for signaling

For E1: 29 DS0 channels for voice traffic; 16th channel is reserved for signaling

Any channel can be configured for common channel signaling

ISDN Primary Rate Interface signaling: Each interface supports 23 channels for T1 and 30 channels for E1. The default mode is for the 24th T1 channel or 16th E1 channel to be reserved for signaling. Both network side and user side operation modes are supported.

T1 binary 8-zero substitution/alternate mark inversion (B8ZS/AMI) line coding, u-law or a-law coding

E1 HDB3 line coding

T1 line bit rate: 1.544 Mbps

E1 line bit rate: 2.048 Mbps

T1 line code: AMI, B8ZS

E1 line code: HDB3

Framing format: D4 superframe and extended superframe

Link Management

FDL1 is a link management protocol that is used to help diagnose problems and gather statistics on T1 lines

1. FDL = Facilities Data Link

Converged Voice Gateway

The Cisco Voice Gateway 200 (VG200) allows you to connect the standard POTS phones (connected directly to the gateway or anywhere on the PSTN) with Cisco IP or any H.323-compliant telephony devices. When used with Cisco CallManager, the VG200 functions as a Media Gateway Control Protocol (MGCP) gateway. The Cisco VG200 provides a 10/100BASE-T Ethernet port for connection to the data network. The following telephony connections are also available:

One to four Foreign Exchange Office (FXO) ports for connecting to a central office or PBX

One to four FXS ports for connecting to POTS telephony devices

Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7

 

OL-8978-02

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Cisco Systems OL-8978-02 manual Converged Voice Gateway, Digital Signal Processing Per T1/E1 Port, Link Management, 55-7

OL-8978-02 specifications

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