Cisco Hoot and Holler over IP
Feature Overview
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Cisco IOS Release 12.1(5)T
Figure 2 Hoot and Holler over IP using Cisco 2600 and Cisco 3600 Series Routers
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 ov er
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 Voice over IP
(VoIP) technology to create a point-to-multipoint hoot and holler network over an IP connection.
Voice multicasting telephones can be connected to routers in the following ways:
•Connect a 4-wire E&M telephone, which has no dial and is always off-hook, directly to an E&M
voice interface card that is installed in a voice network module. Configure the E&M interface for
four-wire trunk operation. For information about configuring E&M interfaces, see the
Cisco IOS Multiservice Applications Configuration Guide, Release 12.1.
•Connect a conventional telephone to a PBX that is connected to an E&M voice interface card.
•Connect a conventional telephone to an FXS voice interface card that is installed in a voice network
module.
•Connect a conventional telephone to a PBX that is connected through a E1/T1 line to a multiflex
trunk interface card that is installed in a high-density voice network module.
Note The voice multicasting feature supports only one E1/T1 line per high-density voice
network module.
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Multicast group 1
Multicast group 2
FXS
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&M phones
Turret Turret
Turret
PBX
PBX
PBX
FXO
FXO
FXO
T1/E1
T1/E1
Multicast group 3
E&M = ear and mouth