Table Of Contents
Configuring ISDN NSF on Cisco 1751 and Cisco 1760 Routers
ISDN NSF Route Pattern and PRI Backhaul
Understanding Route Plans and Route Patterns
Considerations for Using Route Patterns
Obtaining Technical Assistance
Obtaining Additional Publications and Information
Configuring ISDN NSF on Cisco 1751 and Cisco 1760 Routers
This document describes support for Integrated Services Digital Network (ISDN) Network Specific Facility (NSF) on Cisco 1751 and Cisco 1760 routers.
Note
Cisco CallManager 3.3(2) is the first Cisco CallManager release that supports this feature.
Contents
This document includes the following sections:
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Configuring NSF
By configuring a gateway for NSF, you can have the gateway request a particular service from the network or provide an indication of the service being provided. NSF provides call-by-call support, meaning that an ISDN B channel can be used for any service; its use is not restricted to a certain preconfigured service, such as incoming 800 calls or outgoing 800 calls.
Cisco CallManager 3.3(2) enables you to configure NSF. Configuring NSF makes it possible to invoke network-specific services or facilities on a call-by-call basis by configuring the fields in the ISDN Network-Specific Facilities Information Element section in the Cisco CallManager Route Pattern Configuration window. Cisco CallManager uses the network-specific services and facilities when the user dials the route pattern.
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MGCP Gateway Fallback
Media Gateway Control Protocol (MGCP) gateway fallback is designed to improve the reliability of PSTN interfaces on MGCP gateways in a network. Basic call processing support is provided when the gateway loses connectivity to all of the CCM servers. A prioritized list of CCM servers is configured on the gateway, making each CCM server potentially available for use as a backup call agent.
On startup, the MGCP gateway attempts to establish a TCP connection to the highest order CCM server on the configured list. If successful, the gateway registers itself with the primary (highest priority) call agent. If no call agent is accessible, the gateway falls back to the default H.323 session application (Version 2) to perform basic call-handling functions.
ISDN NSF Route Pattern and PRI Backhaul
The ISDN NSF route pattern design has been changed in the Cisco CallManager database to enable invocation of facilities or services on a call-by-call basis. The NSF information is used in ISDN PRI call setup for outgoing calls and includes carrier identification code (CIC) and service parameters. The NSF configuration tasks are done in Cisco CallManager.
The NSF configuration has been added in the route pattern user interface page for MGCP-controlled PRI ports. Without the NSF configuration, users have to configure their associated gateways as stand-alone H.323 gateways for which NSF services are configured locally within the router. With NSF configured, NSF can be used on a call-by-call basis.
ISDN PRI backhaul provides a method for transporting complete IP telephony signaling information from an ISDN PRI interface of an MGCP gateway to Cisco CallManager using a highly reliable TCP connection. A single TCP connection is used by the gateway to backhaul all the ISDN D channels to Cisco CallManager. The "SAP/Channel ID" parameter in the header of each message identifies individual D channels. In addition to carrying the backhaul traffic, the inherent TCP keepalive mechanism is also used to determine MGCP gateway connectivity to an available call agent.
ISDN PRI backhaul terminates all the ISDN PRI Layer 2 (Q.921) signaling functions in the Cisco IOS code on the MGCP gateway while, at the same time, packaging all the ISDN PRI Layer 3 (Q.931) signaling information into packets for transmission to Cisco CallManager through an IP tunnel over a highly reliable TCP connection. This methodology ensures the integrity of the Q.931 signaling information being passed through the network for managing IP telephony devices. A rich set of user-side and network-side ISDN PRI calling functions is supported by ISDN PRI backhaul.
The MGCP gateway also establishes a TCP link to a backup Cisco CallManager server. In the event of Cisco CallManager switchover, the ISDN PRI backhaul functions are assumed by the secondary server.
Understanding Route Plans and Route Patterns
The Route Plan drop-down list on the Cisco CallManager menu bar allows you to configure Cisco CallManager route plans by using route patterns, route filters, route lists, and route groups.
Route patterns, route filters, route lists, and route groups provide flexibility in network design. Route patterns work in conjunction with route filters to direct calls to specific devices and to include or exclude specific digit patterns.
Tip
Note
Cisco CallManager uses route patterns to route or block both internal and external calls. A directory number specifies a type of route pattern that is applied to a Cisco IP Phone. Gateways and Cisco IP Phones can also use more complex route patterns that can contain wildcards.
Updates to route patterns automatically reset the associated gateway and route list.
Caution
For route pattern configuration instructions, refer to the "Route Pattern Configuration" chapter in the Cisco CallManager Administration Guide, Release 3.3(2).
Considerations for Using Route Patterns
When using route patterns, take the following considerations into account:
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Related Documentation
For additional information, refer to the following documentation:
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Obtaining Documentation
The following sections provide sources for obtaining documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at the following sites:
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Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package, which ships 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 as an annual subscription.
Ordering Documentation
Cisco documentation is available in the following ways:
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http://www.cisco.com/cgi-bin/order/order_root.pl
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http://www.cisco.com/go/subscription
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Documentation Feedback
If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address:
Attn Document Resource Connection
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.
Cisco.com
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.
Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you to:
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You can self-register on Cisco.com to obtain customized information and service. To access Cisco.com, go to the following URL:
Technical Assistance Center
The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two types of support are available through the Cisco TAC: the Cisco TAC Web Site and the Cisco TAC Escalation Center.
Inquiries to Cisco TAC are categorized according to the urgency of the issue:
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Which Cisco TAC resource you choose is based on the priority of the problem and the conditions of service contracts, when applicable.
Cisco TAC Web Site
The Cisco TAC Web Site allows you 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 Web Site, go to the following URL:
All customers, partners, and resellers who have a valid Cisco services contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires 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 the following URL to register:
http://www.cisco.com/register/
If you cannot resolve your technical issues by using the Cisco TAC Web Site, and you are a Cisco.com registered user, you can open a case online by using the TAC Case Open tool at the following URL:
http://www.cisco.com/tac/caseopen
If you have Internet access, it is recommended that you open P3 and P4 cases through the Cisco TAC Web Site.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses issues that are classified as priority level 1 or priority level 2; 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 will automatically open a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to the following 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). In addition, 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/products/products_catalog_links_launch.html
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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.
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