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Cisco Hoot and Holler over IP
The voice multicasting feature on Cisco 2600 and Cisco 3600 series routers uses Cisco Voice-over-IP
(VoIP) technology to create a permanently connected point-to-multipoint hoot and holler network over
an IP connection.
Four-wire E&M, E1/T1, FXO, and FXS configurations provide continuous VoIP connections across a
packet network using the connection-trunk mechanism. By using the inherent point-to-multipoint
connectivity of IP multicast (IPmc), the routers can ta
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Cisco Hoot and Holler over IP Feature Overview Hoot and holler is used in these various industries as a way to provide a one-to-many or many-to-many conferencing service for voice communications. In the past, hoot and holler was deployed using point-to-point telco circuits and a hoot and holler bridging and mixing functionality that was provided either by the customer or as a service of the Public Switched Telephone Network (PSTN) carrier. A common use of hoot and holler is a broadcast audi
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Cisco Hoot and Holler over IP Feature Overview Hoot and holler networks are typically spread over four to eight sites, although financial retail networks may have hundreds of sites interconnected. Within a site, bridging (mixing voice signals) is done locally with a standard analog or digital bridge that may be part of a trading turret system. Between sites, there are two prevalent methods for providing transport: � Point-to-point leased lines with customer-provided audio bridging at a cent
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Cisco Hoot and Holler over IP Feature Overview Figure 2 Hoot and Holler over IP using Cisco 2600 and Cisco 3600 Series Routers PBX V FXO Multicast group 1 E&M phones V PBX FXO Multicast group 3 V V FXS Multicast group 2 FXO V PBX T1/E1 V T1/E1 Turret Turret Turret E&M = ear and mouth 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 inbou
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Cisco Hoot and Holler over IP Feature Overview IP/TV Access The Cisco Hoot and Holler over IP feature enables you to access ongoing IP/TV multicasts for listening to voice content of the IP/TV session. For complete information on IP/TV, see the IP/TV Content Manager Installation and User Guide . Figure 3 Cisco Hoot and Holler over IP Access to IP/TV Multicast IP/TV IP/TV Content Manager server IP/TV viewer For the Cisco Hoot and Holler over IP and IP/TV interaction to work correctly: � Ensur
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Cisco Hoot and Holler over IP Feature Overview – The port number must be 80, because it is HTTP. – Click OK and exit. Note In the Content Manager, be sure to specify the multicast IP address and RTP port for the Cisco Hoot and Holler over IP session. Interactive Voice Response (IVR) The Cisco Hoot and Holler over IP feature can support Interactive Voice Response (IVR) as a means of authentication, authorization, and accounting (AAA) control. See the section “Configuring Interactive Voice Re
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Cisco Hoot and Holler over IP Feature Overview Technical Details of the Cisco Hoot and Holler over IP Solution This section describes how Cisco Hoot and Holler over IP works from a technical perspective. It covers design considerations in terms of IOS configurations and DSP mixing functionality as well as bandwidth planning and QoS, with the following assumptions: 1. That you have some level of Cisco IOS experience. 2. That you have some experience configuring QoS features with Cisco IOS. If
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Cisco Hoot and Holler over IP Feature Overview is handled by the onboard DSPs on each voice-card (NM-1V, NM-2V or NM-HDV). Arbitration involves identifying the various sources of the voice stream, and mixing involves taking some of those voice streams and combining them into a single-sourced voice stream. Cisco Hoot and Holler over IP can handle many inbound voice streams, but it only arbitrates and mixes three streams to be heard within the Hoot group. This value works fine in most applic
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Cisco Hoot and Holler over IP Feature Overview The uncompressed bandwidth includes IP/UDP/RTP headers (40 bytes) in the bandwidth calculation. Compressed RTP (cRTP) reduces the IP/UDP/RTP headers to between 2 to 4 bytes per packet. The calculation of compressed bandwidth below uses 4 bytes for a compressed IP/UDP/RTP header per packet. Maximum RTCP bandwidth is five percent of the total RTP traffic in a hoot and holler session. Since the Cisco Hoot and Holler over IP application supports m
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Cisco Hoot and Holler over IP Feature Overview enabled or disabled, but since the DSPs also have to do arbitration and mixing, VAD must be disabled to reduce the DSPs processing load. In addition to enabling VAD (which is on by default), network administrators should modify the VAD parameters that sense background noise so that idle noise does not consume bandwidth. This can be configured as in the following E&M port example: voice class permanent 1 signal timing oos timeout disabled signal
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Cisco Hoot and Holler over IP Feature Overview In this example, the digits in the connection trunk 111 string match the destination pattern of the VoIP dial peer. Also, the session protocol is set to multicast and the session target is pointing to the IPmc group number with the UDP port (22222) predefined. Benefits Cisco Hoot and Holler over IP provides the following benefits: � Eliminates yearly reoccurring circuit-switched telecom charges (toll-bypass). � Eliminates the need for leased-lin
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Cisco Hoot and Holler over IP Supported Platforms Supported Platforms Router Platforms: � Cisco 2600 � Cisco 3600 series Network Modules: � NM-HDV � NM-1V � NM-2V Supported Standards, MIBs, and RFCs Standards No new or modified standards are supported by this feature. MIBs No new or modified MIBs are supported by this feature. To obtain lists of MIBs supported by platform and Cisco IOS release and to download MIB modules, go to the Cisco MIB web site on Cisco Connection Online (CCO) at http
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Cisco Hoot and Holler over IP Configuration Tasks Configuring Multicast Routing (Required) To enable multicast routing on the platform, perform the following steps: Command Purpose Router(config)# ip multicast-routing Step 1 Enables multicast routing. Configuring the Virtual Interface (Required) To configure the virtual interface for multicast fast switching, perform the following steps: Command Purpose Router(config)# interface vif1 Step 1 Defines a virtual interface for multicast fast switc
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Cisco Hoot and Holler over IP Configuration Tasks Command Purpose Router(config-dial-peer)# ip precedence number Step 5 (Optional) Specifies the IP precedence. Step 6 Router(config-dial-peer)# codec (codec-type} Configures the codec. You must configure the same codec on all dial peers in a session. When the default codec, g729r8, is used, it does not appear in the configuration when the show running command is used. Cisco IOS Release 12.1(5)T 14
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Cisco Hoot and Holler over IP Configuration Tasks Configuring E&M Voice Ports (Required, if used) If using E&M voice ports, configure them by performing the following steps: Command Purpose Router(config)# voice class permanent tag1 Step 1 Defines voice class for transmit-receive mode. Step 2 Router(config-class)# signal timing oos timeout Disables signaling loss detection. disabled Router(config-class)# signal keepalive number Step 3 Specifies keepalive signaling packet interval. Router(confi
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Cisco Hoot and Holler over IP Configuration Tasks Command Purpose Router(config-voice-port)# signal { wink-start | Step 11 Configures the signaling type for E&M voice immediate | delay-dial } ports. The default is wink-start. Select immediate for the Cisco Hoot and Holler over IP application. In the immediate-start protocol, the originating side does not wait for a wink before sending addressing information. After receiving addressing digits, the terminating side then goes off-hook for
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Cisco Hoot and Holler over IP Configuration Examples Command Purpose Router(config-if)# ip pim { sparse mode | dense-mode | Step 3 Specifies Protocol Independent Multicast (PIM). sparse-dense-mode } Whatever mode you choose should match all the interfaces in all the routers of your network. Step 4 Router(config-if)# no shutdown Enables the interface. Configuring Voice Ports in High-Density Voice Network Modules (Required, if using T1/E1) A multiflex trunk interface card (NM-HDV) in a high-
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Cisco Hoot and Holler over IP Configuration Examples Note In all of the following configuration examples, the routers are configured with an interface vif1 command. This is a virtual interface that is similar to a loopback interface—it is a logical IP interface that is always up when the router is active. In addition, it must be configured so that the Cisco Hoot and Holler over IP packets that are locally mixed on the DSPs can be fast-switched along with the other data packets. This inter
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Cisco Hoot and Holler over IP Configuration Examples Note The connection-trunk connection type is a point-to-point connection, similar to a tie-line on a PBX network. All voice traffic—including signaling—placed at one end is immediately transferred to the other. Note The E&M voice port must be configured for 4-wire operation. Configuring the Second Router In router Costello (Figure 4), the E&M phone is connected to voice port 3/1/1. Router Costello uses the same configuration as Abbott, ex
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Cisco Hoot and Holler over IP Configuration Examples Verifying the Configuration If you have configured your routers by following these examples, you should now be able to talk over the telephones. You can also use the show dial-peer voice command on each router to verify that the data you configured is correct. To verify that an audio path has been established, use the show call active voice command. This command displays all active voice calls traveling through the router. High-Density Vo
