CHAPTER 1
Introduction to Cisco VG400 Voice Gateway
Cisco medium-density Analog Voice Gateway provide enterprises, managed services providers, and service
providers the ability to directly connect public-switched telephone networks (PSTNs) and existing telephony
equipment to Cisco 4000 Series Integrated Services Routers. These FXS and FXO ports provide Dual-Tone
Multifrequency (DTMF) detection, voice compression and decompression, call progress tone generation,
Voice Activity Detection (VAD), echo cancellation, and adaptive jitter buffering. Cisco VG400 Voice Gateway
is a medium-density analog voice gateway. It is an intermediate path that enables TDM to IP transition.
The Cisco VG400 Voice Gateway supports the following interfaces:
• Two RJ45 Gigabit Ethernet (GE) ports
• One RJ45 Console Port
• One USB 2.0 Port
• LED for System, GE Port, and Console Port Status
• Features and Benefits of Cisco VG400 Voice Gateway, on page 1
• Cisco VG400 Voice Gateway Chassis, on page 3
• LED Indicators, on page 4
• Slot, Bay, and Ports, on page 5
• Technical and Compliance Specifications, on page 7
• Platform and Software Requirements, on page 9
Features and Benefits of Cisco VG400 Voice Gateway
Cisco VG400 Voice Gateway provides VoIP connectivity to analog devices, such as analog desk phones,
analog conference room phones, fax machines, and modems. Cisco 400 Voice Gateway provides several
improvements from the previous high-density analog and digital extension modules (EVMs), in the following
ways:
• On-board Digital Signal Processor (DSP)—The FXO and FXS ports contain an onboard DSP and
don’t require the router to have a dedicated packet voice DSP module (PVDM) on the motherboard. The
DSP on the voice module is necessary for the voice features. It also provides for echo cancellation of up
to 128-ms echo-tail length for demanding network conditions.
• FXS-E (extended loops) support—FXS ports on the new modules support FXS-E with the following
details:
• Higher loop current (35 mA) to accommodate specialty phones
• Longer loop length for loops with 26 AWG wire, up to 11,000 feet (3400 meters)
Cisco VG400 Voice Gateway Hardware Installation Guide
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