Cisco Systems VC-825 appendix Voice Multicasting, VC-828

Cisco Hoot and Holler over IP

Hoot and Holler over IP Overview

This dynamic sharing of bandwidth is even more compelling with hoot and holler than with a toll-bypass application because some hoot circuits may be active for an hour or two for morning reports but dead for the rest of the day—the idle bandwidth can be used by the data applications during these long periods of inactivity.

Beginning with Cisco IOS Release 12.1(2)XH, Cisco hoot and holler over IP can be implemented using Cisco's VoIP technology. This solution leverages Cisco’s IOS expertise in VoIP, quality of service (QoS), and IP multicasting (IPmc) and is initially available on Cisco 2600 and 3600 series multiservice routers.

Figure 132 shows a diagram of the Cisco hoot and holler over IP solution connecting legacy hoot equipment over an IP network.

Note The “V” on the Cisco router icons signifies that some of the hoot and holler bridging function is being done by the router's digital signal processors (DSPs).

Figure 132 Hoot and Holler over IP Using Cisco 2600 and Cisco 3600 Series Routers

			FXO
E&M phones	Multicast group 1	V
	Multicast group 3		FXO
			V
V
FXS	Multicast group 2
		V	FXO
		T1/E1
	V
	T1/E1
			Turret

PBX

PBX

PBX

35839

E&M = ear and mouth

TurretTurret

FXO = Foreign Exchange Office

Four-wire E&M, E1/T1, FXO, and FXS configurations provide continuous VoIP connections across a packet network. By using the inherent point-to-multipoint characteristic of IPmc, the routers can take several inbound voice streams from the traditional hoot devices and forward the packetized voice over the IP network to all parties within a defined hoot and holler group.

Voice Multicasting

The voice multicasting feature on Cisco 2600 and Cisco 3600 series routers uses Cisco VoIP technology to create a point-to-multipoint hoot and holler network over an IP connection.

Cisco IOS Voice, Video, and Fax Configuration Guide

VC-828