Table Of Contents
FXO, FXS, and E&M Voice Interface Card Support on Cisco 1700 Series Routers
VIC2-2FXS, VIC2-2FXO, and VIC2-4FXO
Restrictions on VIC2-4FXO Usage
CAMA Functionality on VIC2-2FXO and VIC2-4FXO
Configuration and Verification
Obtaining Technical Assistance
Obtaining Additional Publications and Information
FXO, FXS, and E&M Voice Interface Card Support on Cisco 1700 Series Routers
This document describes the support on the Cisco 1751 and Cisco 1760 routers for the following new voice interface cards (VICs):
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VIC2-2FXO, the 2-port Foreign Exchange Office (FXO) VIC, including CAMA functionality
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This document contains the following sections:
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VIC2-2FXS, VIC2-2FXO, and VIC2-4FXO
An FXS interface connects directly to a standard telephone, fax machine, PBX, or similar device, and supplies ring, voltage, and dial tone to the station.
An FXO interface connects local calls to a public switched telephone network (PSTN) central office or to a PBX that does not support E&M signaling. This is the interface a standard telephone provides.
To configure the ports on the 2-port VIC2-2FXS VIC, the 2-port VIC2-2FXO VIC and the 4-port VIC2-4FXO VIC, refer to the "Configure FXS or FXO Voice Ports" section in the Cisco 1751 Router Software Configuration Guide.
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Restrictions on VIC2-4FXO Usage
When configured for operation in countries that use the TBR21 mode, the use of VIC2-4FXO cards is subject to the following limitations.
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When not operating in the TBR21 mode, these limitations do not apply.
These restrictions do not apply to VIC2-2FXO cards.
CAMA Functionality on VIC2-2FXO and VIC2-4FXO
The 2-port VIC2-2FXO VIC and the 4-port VIC2-4FXO VIC have the capabilty to operate in the Centralized Automated Message Accounting (CAMA) mode of operation.
Software Requirements
CAMA functionality on VIC2-2FXO and VIC2-4FXO VICs in Cisco 1751 and Cisco 1760 routers requires Cisco IOS Release 12.3(2)XA or later.
Overview of CAMA
CAMA is a signaling protocol that was originally designed for toll call billing purposes but has been adapted to carry a single telephone number for Enhanced 911 (E911) purposes. E911 is an emergency telephone system capable of automatically displaying the callback number (and in some cases the location) of a person who dials 911 to request emergency help from public safety agencies.
The North American emergency E911 phone system consists of a voice network that is built largely outside of the normal PSTN on which common voice traffic rides. Calls to emergency services are treated specially because they are routed differently from normal traffic within the PSTN. Calls to emergency services are routed on the basis of the calling number, not the called number. The calling number is checked against a database of emergency service providers that cross-references the service providers for the caller's particular location. When this information is determined, the call is then routed to the proper public service answering point (PSAP), which dispatches services to the caller's location.
During setup of a call to E911, before the audio channel is connected, the calling number is transmitted to each switching point, known as a Selective Router (SR), via CAMA. CAMA is used because it carries both the calling and called number using in-band signaling.This allows the telephone system to send a station identification number to the PSAP through the telephone company's E911 equipment. CAMA trunks are used in 80 percent of the E911 network today.
The calling number is needed at the PSAP for two reasons:
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Figure 1 shows the topography in existing E911 networks. Figure 2 shows an E911 network using the VIC2-2FXO or VIC2-4FXO card, configured for CAMA, in a Cisco 1751 or Cisco 1760 router.
Figure 1 Existing E911 Networks
Figure 2 Analog CAMA E911 Networks
Configuring CAMA
To configure a VIC2-2FXO or VIC2-4FXO card to recognize CAMA signaling, perform the following steps in global configuration mode.
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The CAMA signaling options are as follows:
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NPD values range from 0 through 3. Examples of telephone numbers in this signaling option are:
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Configuring ANI Mapping
To configure a VIC2-2FXO or VIC2-4FXO card for 8-digit ANI transmission, perform the following steps in global configuration mode.
Configuration and Verification
The following example shows the configuration of the VIC2-2FXO card for 8-digit transmission. In this example, ANI mapping is shown for the following area codes (NPAs): 0=408, 1=510, 2=650, 3=415.
voice-port 0/0ani mapping 0 408ani mapping 1 510ani mapping 2 650ani mapping 3 415signal cama KP-NPD-NXX-XXXX-STshutno shutConfiguration may be verified by use of the show run command, or the show voice port command, or the show voice port summary command.
router # show run...!voice-port 0/0ani mapping 0 408ani mapping 1 510ani mapping 2 650ani mapping 3 415signal cama KP-NPD-NXX-XXXX-ST!...endThe following example shows the result of a show voice port summary command on a router with a VIC2-2FXO card in slot 0. Port 0 is configured for CAMA, and port 1 is configured for normal FXO operation.
router# show voice port summary----------------------------------------------------PORT CH SIG-TYPE ADMIN OPER STATUS STATUS EC========= == ============ ===== ==== ======== ======== ==0/0 -- fxo-cama up up idle on-hook y0/1 -- fxo-ls up up idle on-hook yVIC2-2E/M
An E&M interface connects remote calls from an IP network to PBX trunk lines (tie lines) for local distribution.
To configure the ports on the 2-port VIC2-2E/M VIC, refer to the "Configure E&M Voice Ports section" in the Cisco 1751 Router Software Configuration Guide.
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Related Documentation
For information on installing FXO, FXS, and E&M VICs in Cisco 1700 series routers, refer to the following:
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For additional information about installing and configuring the Cisco 1751 and Cisco 1760 routers, go to the Cisco 1700 series routers website
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1700/index.htm
and refer to the following documentation:
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Obtaining Documentation
Cisco provides several ways to obtain documentation, technical assistance, and other technical resources. These sections explain how to obtain technical information from Cisco Systems.
Cisco.com
You can access the most current Cisco documentation on the World Wide Web at this URL:
http://www.cisco.com/univercd/home/home.htm
You can access the Cisco website at this URL:
International Cisco web sites can be accessed from this URL:
http://www.cisco.com/public/countries_languages.shtml
Documentation CD-ROM
Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which may have shipped with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription.
Registered Cisco.com users can order the Documentation CD-ROM (product number DOC-CONDOCCD=) through the online Subscription Store:
http://www.cisco.com/go/subscription
Ordering Documentation
You can find instructions for ordering documentation at this URL:
http://www.cisco.com/univercd/cc/td/doc/es_inpck/pdi.htm
You can order Cisco documentation in these ways:
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http://www.cisco.com/en/US/partner/ordering/index.shtml
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http://www.cisco.com/go/subscription
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Documentation Feedback
You can submit comments electronically on Cisco.com. On the Cisco Documentation home page, click Feedback at the top of the page.
You can e-mail your comments to bug-doc@cisco.com.
You can submit your comments by mail by using the response card behind the front cover of your document or by writing to the following address:
Cisco Systems
Attn: Customer Document Ordering
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com, which includes the Cisco Technical Assistance Center (TAC) Website, as a starting point for all technical assistance. Customers and partners can obtain online documentation, troubleshooting tips, and sample configurations from the Cisco TAC website. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC website, including TAC tools and utilities.
Cisco.com
Cisco.com offers a suite of interactive, networked services that let you access Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.
Cisco.com provides a broad range of features and services to help you with these tasks:
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To obtain customized information and service, you can self-register on Cisco.com at this URL:
Technical Assistance Center
The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two levels of support are available: the Cisco TAC website and the Cisco TAC Escalation Center. The avenue of support that you choose depends on the priority of the problem and the conditions stated in service contracts, when applicable.
We categorize Cisco TAC inquiries according to urgency:
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Cisco TAC Website
You can use the Cisco TAC website to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC website, go to this URL:
All customers, partners, and resellers who have a valid Cisco service contract have complete access to the technical support resources on the Cisco TAC website. Some services on the Cisco TAC website require a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to this URL to register:
http://tools.cisco.com/RPF/register/register.do
If you are a Cisco.com registered user, and you cannot resolve your technical issues by using the Cisco TAC website, you can open a case online at this URL:
http://www.cisco.com/en/US/support/index.html
If you have Internet access, we recommend that you open P3 and P4 cases through the Cisco TAC website so that you can describe the situation in your own words and attach any necessary files.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses priority level 1 or priority level 2 issues. These classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer automatically opens a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to this URL:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
Before calling, please check with your network operations center to determine the level of Cisco support services to which your company is entitled: for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). When you call the center, please have available your service agreement number and your product serial number.
Obtaining Additional Publications and Information
Information about Cisco products, technologies, and network solutions is available from various online and printed sources.
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http://www.cisco.com/en/US/about/ac123/ac114/about_cisco_packet_magazine.html
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http://business.cisco.com/prod/tree.taf%3fasset_id=44699&public_view=true&kbns=1.html
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http://www.cisco.com/en/US/about/ac123/ac147/about_cisco_the_internet_protocol_journal.html
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http://www.cisco.com/en/US/learning/le31/learning_recommended_training_list.html
This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
Copyright © 2003 Cisco Systems, Inc. All rights reserved.
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