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Voice over IP for the Cisco AS5800
The Voice over IP for the Cisco AS5800 feature adds Voice over IP carrier-class gateway
functionality to the Cisco AS5800 platform. This document contains the following sections:
• Feature Overview, page 1
� Supported Platforms, page 5
� Supported Standards, MIBs, and RFCs, page 5
� Prerequisites, page 6
� Configuration Tasks, page 7
� Configuration Example, page 19
� Command Reference, page 21
Feature Overview
Voice over IP (VoIP) enables a Cisco AS5800 unive
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Feature Overview Benefits Two-Stage-Dial Toll Bypass With Voice over IP on the Cisco AS5800, you can leverage your network’s WAN infrastructure to offer long distance toll bypass services. Toll bypass occurs in two stages. For example, customers can be assigned an account number and a Personal Identification Number (PIN). When a user dials a local number or a 1-800-Internet Telephone Service Provider (ITSP) number, she connects to the local VoIP point of presence. She is then prompted by the
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Benefits Figure 1 Two-Stage Dial Toll Bypass Gatekeeper Gatekeeper Zone A Zone B QoS WAN Cisco RAS Cisco gatekeeper gatekeeper RAS RAS H.225/H.245 RTP Cisco Cisco gateway gateway PRI PRI Cisco Cisco IP/PSTN IP/PSTN Digital sound Fax gateway gateway voice mail server PRI PRI PSTN PSTN Voice-Traffic and Fax-Traffic Off load Carriers can leverage their WAN infrastructure to off load voice and fax traffic from their congested PSTN networks by using the Cisco AS5800 as a carrier class voice gatew
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Feature Overview Figure 2 VoIP Used as a PSTN Gateway to Off load Voice Traffic and Fax Traffic Local Exchange Local Exchange Carrier Carrier T1 ISDN T1 ISDN PRI PRI WAN Cisco AS5800 Cisco AS5800 Universally Accessible Voice-Mail and Fax-Mail Services VoIP on the Cisco AS5800 can be used to leverage the technology prefixes feature. Gateways (with voice/fax feature cards) that are connected to the voice-mail and fax-mail servers can be identified by gatekeepers based on a prefix prepended to an
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Supported Platforms � Voice, Video, and Home Applications Command Reference, Cisco IOS Release 12.0 � Quality of Service Configuration Guide, Cisco IOS Release 12.0 � Quality of Service Command Reference, Cisco IOS Release 12.0 � Voice over IP for the Cisco AS5800 Software Configuration Guide, Cisco IOS Release 12.0(4)XL. Supported Platforms � Cisco AS5800 universal access servers � Cisco AS5300 access servers � Cisco 2600 series routers � Cisco 3600 series routers Supported Standards, MIBs, an
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Prerequisites Prerequisites Before you can configure your Cisco AS5800 to use Voice over IP, you must first: � Install a version of the Cisco IOS software that supports DSPWare 3.1.7 specific to the Cisco AS5800 (for example, Cisco IOS Release 12.0(4)XL or Cisco IOS Release 12.0(7)T). � Establish a working IP network. For more information about configuring IP, refer to the “IP Overview,” “Configuring IP Addressing,” and “Configuring IP Services” chapters in the Cisco IOS 12.0 Network Protocol
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Configuration Tasks � Integrate your dial plan and telephony network into your existing IP network topology. Merging your IP and telephony networks depends on your particular IP and telephony network topology. In general, we recommend the following suggestions: — Use canonical numbers wherever possible. It is important that you avoid situations where numbering systems are significantly different on different routers or access servers in your network. — Make routing and dialing transparent to
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Configuration Tasks same operations; the QoS tasks they perform might also differ. To configure your IP network for real-time voice traffic, you need to consider the functions of both edge and backbone routers in your network, then select the appropriate QoS tool or tools. In general, edge routers perform the following QoS functions: � Packet classification � Admission control � Bandwidth management � Queuing In general, backbone routers perform the following QoS functions: � High-speed switc
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Configuring Voice Ports To configure basic ISDN parameters for Voice over IP on the Cisco AS5800, perform the following steps: Step Command Purpose 1 Router(config)# isdn switch-type switch-type Defines the telephone company’s switch type. Router(config)# controller T1 1/0/0 2 Enables the T1 0 controller on the T1 card and enters or controller configuration mode, or Router(config)# controller T1 1/0/0:1 Enables the T1 1 controller on the T3 card and enters controller configuration mode. 3 Rou
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Configuration Tasks Step Command Purpose 3 Router(config-voiceport)# cptone country Selects the appropriate voice call progress tone for this interface. The default for this command is us. For a list of supported countries, refer to the Multiservice Applications Command Reference. Router(config-voiceport)# compand-type {a-law|u-law} 4 Selects a companding type for this voice port. 5 Router(config-voiceport)# connection {plar string|trunk (Optional) Specifies either the trunk connection or the
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Configuring Voice Ports Step Command Purpose 10 Router(config-voiceport)# timeouts interdigits seconds Specifies the number of seconds the system will wait (after the caller has input the initial digit) for the caller to input a subsequent digit. Valid entries for this command are from 0 to 120. Router(config-voiceport)# timeouts ringing 11 Specifies the number of seconds the system will continue {seconds|infinity} to ring the destination if there is no answer. Router(config-voiceport)# tim
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Configuration Tasks Configuring Dial Peers The key point to understanding how VoIP functions is to understand dial peers. Each dial peer defines the characteristics associated with a call leg, as shown in Figure 3 and Figure 4. A call leg is a discrete segment of a call connection that lies between two points in the connection. All of the call legs for a particular connection have the same connection ID. There are two different kinds of dial peers: � POTS—Dial peer describing the characteris
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Configuring Dial Peers POTS peers associate a telephone number with a particular voice port so that incoming calls for that telephone number can be received and outgoing calls can be placed. VoIP peers point to specific devices (by associating destination telephone numbers with a specific IP address) so that incoming calls can be received and outgoing calls can be placed. Both POTS and VoIP peers are needed to establish VoIP connections. Configuring POTS Peers POTS peers enable incoming cal
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Configuration Tasks prefix, “9,” to the front of the remaining numbers, so that the actual numbers dialed is “9, 2222.” The comma in this example means that the router will pause for one second between dialing the “9” and the “2” to allow for a secondary dial tone. Direct Inward Dial for POTS Peers Direct inward dial (DID) is used to determine how the called number is treated for incoming POTS call legs. As shown in Figure 5, incoming means from the perspective of the router. In this case, it
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Configuring Dial Peers Using the elements, the algorithm is as follows: For all peers where call type (VoIP versus POTS) match dial peer type: if the type is matched, associate the called number with the incoming called-number else if the type is matched, associate calling-number with answer-address else if the type is matched, associate calling-number with destination-pattern else if the type is matched, associate voice port to port This algorithm shows that if a value is not configured for ans
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Configuration Tasks Step Command Purpose 1 Router(config)# dial-peer voice number pots Enter the dial peer configuration mode to configure a POTS peer. 2 Router(config-dial-peer)# incoming called-number Specify direct inward dial for this POTS peer. number Configuring VoIP Peers VoIP peers enable outgoing calls to be made from a particular telephony device. To configure a VoIP peer, you need to uniquely identify the peer (by assigning it a unique tag number), define its destination telephone
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Configuring the Cisco AS5800 as an H.323 Gateway � Use the show dialplan number command on the local and remote routers to verify that the data is configured correctly on both. � If you have configured number expansion, use the show num-exp command to check that the partial number on the local router maps to the correct full E.164 telephone number on the remote router. � If you have configured a CODEC value, there can be a problem if both VoIP dial peers on either side of the connection have
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Configuration Tasks Verifying Gateway Interface Configuration Use the show gateway command to find the current registration information and status of the gateway. Configuring the Cisco AS5800 for Interactive Voice Response The Interactive Voice Response (IVR) Service Provider application provides IVR capabilities using Tool Command Language (TCL) scripts. For example, an IVR script is played when a caller receives a voice-prompt instruction to enter a specific type of information, such as a P
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Configuration Example Step Command Purpose 4 Router(config-dial-peer)# destination-pattern string Defines the telephone number associated with this POTS dial peer. 5 Router(config-dial-peer)# port shelf/slot/port:D Associates this POTS dial peer with a specific logical dial interface. 6 Router(config-dial-peer)# prefix string (Optional) Specifies the prefix for this POTS dial peer. The prefix string value is sent to the telephony interface first, before the telephone number (destination patt
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Configuration Example Configuring the Cisco 3640 as a Gatekeeper ! Configure the Ethernet interface to be used at the gatekeeper interface. interface Ethernet0/1 ip address 172.30.00.00 255.255.255.0 no ip directed-broadcast no logging event link-status no keepalive ! ! Configure the gatekeeper interface and enable the interface. gatekeeper zone local gk3.gg-dn1 gg-dn1 173.50.00.00 zone prefix gk3.gg-dn1 21* gw-type-prefix 9#* gw ipaddr 173.60.0.0 1720 gw-type-prefix 6#* gw ipaddr 173.60.0.199 1
