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Voice Over Internet Protocol

(VoIP)

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What is Voice over Internet Protocol?

IP

Network

Conversion of sound into digital signal

Encapsulation in IP packet

Transport over network

De-encapsulation and reconversion of digital signal into sound

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Internet

SP MUX

Telco MUX

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Internet

SP MUX

Telco MUX

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VoIP USING CISCO ROUTER

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VoIP

CISCO 1700, 2600, 3600 and above

VIC voice interface card

FXOFXS

E&M

NM-1VNM-2V

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A B

VIC-2FXS

Foreign Exchange Station (FXS) interface connects directly to astandard telephone, fax machine, or similar device and supplies

ring, voltage, and dial tone.

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A

VIC-2E/M

An Ear and Mouth (E&M) interface supports tie-line facilities orsignals between telephone switches. You can use the E&M voiceinterface card (VIC) to integrate VoIP with the legacy voicesolution. The E&M VIC connects the Cisco router to a PBX

PBX

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A

VIC-2FXO

The Cisco Foreign Exchange Office (FXO) interface connection to be directedat the public switched telephone network's (PSTN's) central office or to astation interface on a private branch exchange (PBX). The FXO sits on theswitch end of the connection. It plugs directly into the line side of the switchso the switch thinks the FXO interface is a telephone

PBX

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A B

VIC-2FXS

101 102201 202

10.0.0.1

10.0.0.2

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A(config)#dial-peer voice 10 pots

A(config-dial-peer)#destination-pattern 101

A(config-dial-peer)#port 1/0/0

A(config-dial-peer)#exit

A(config)#dial-peer voice 20 pots

A(config-dial-peer)#destination-pattern 102A(config-dial-peer)#port 1/0/1

A(config-dial-peer)#dial-peer voice 30 voip

A(config-dial-peer)#destination-pattern 201

A(config-dial-peer)#session target ipv4:10.0.0.2

A(config-dial-peer)#dial-peer voice 40 voip

A(config-dial-peer)#destination-pattern 2..

A(config-dial-peer)#session target ipv4:10.0.0.2

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Cisco IP Telephony

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Network Infrastructure forIP Telephony

Determine the features required for each device in thecampus network.

Determine if the physical plant in the campus can supportIP telephony or if an upgrade required.

Provision switches with inline power to support IPphones.

Determine if the network can provide the bandwidthrequired to support both voice and call control traffic.

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Bandwidth Provisioning

Consider voice, video, and data.

Do not exceed 75 percent of the total availablebandwidth for each link.

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Implementing IP Telephony with AuxiliaryVLANs

Requires no end-user intervention

Provides the benefits of VLAN technology for the phone

Preserves existing IP address structure

Uses standards-based 802.1Q/p technology between theswitch and phone

Voice VLAN ID (VVID) = Auxiliary VLAN

IP T l h f th

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IP Telephony for theBuilding Access Submodule

Auxiliary VLANs

802.1p/Q

STP PortFast

UplinkFast

IP T l h f h

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IP Telephony for theBuilding Distribution Submodule

HSRP, HSRP Track

Preempt