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Configuring Voice Ports

Understanding CallTypes

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Local: Does not traverse the WAN or PSTN.

On-net: Occurs between two telephones on the same datanetwork.

Off-net: Occurs when a user dials an access code (such as 9) togain access to the public switched telephone network (PSTN).

PLAR: Automatically connects one telephone to a secondtelephone.

PBX-to-PBX: Originates at one PBX and terminates at another.

Intercluster trunk calls: Occurs when calls are routed by twoseparate Cisco Unified Communications Managers.

On-net-to-off-net: Occurs when calls originate on an internalnetwork and are routed to an external network (usually thePSTN).

Call Types

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Local Calls

IP WAN

555-0188Dial 555-0188PBX

GatewayGateway

Ring!

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On-Net Calls

IP WAN

555-0123

Dial 555-0123PBX

PSTN

Toll Bypass San JoseAustin

GatewayGateway

Ring!

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Off-Net Calls

PSTN

Dial AccessCode 9

Gateway

Ring!

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PLAR Calls

555-0199 Voice PortConfigured toDial:555-0199

PBX

Gateway Gateway

IP WAN

Ring!

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PBX-to-PBX Calls

Toll Bypass

PSTN

Gateway Gateway

555-0150

IP WAN

PBX BPBX A

Ring!!

User Dials 555-0150

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Intercluster Trunk Call

Cisco UnifiedCommunications

ManagerSite A

Cisco UnifiedCommunications

ManagerSite B

IP WAN

IP

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On-Net-to-Off-Net Call

Toll Bypass

PSTN

Gateway

IP WAN

Gateway

1. 2.

3.

WAN is down orcongested.

4.

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Summary

There are seven typical call types in a VoIP network.

A local call is handled entirely by the router and does not travelover an external network.

On-net calls can be routed through one or more voice-enabledrouters, but the calls remain on the same network.

An off-net call occurs when a user dials an access code (such as9) from a telephone that is directly connected to a voice-enabledrouter or PBX to gain access to the PSTN.

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Summary (Cont.)

PLAR calls automatically connect one telephone to a secondtelephone when the first telephone goes off hook.

A PBX-to-PBX call originates at one PBX and terminates at anotherPBX while using the network for voice transport.

Intercluster trunk calls are routed between Cisco UnifiedCommunications Manager clusters using a trunk.

On-net to off-net calls originate on an internal network and arerouted to an external network.

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