Home > Articles > Cisco Network Technology > IP Communications/VoIP > Voice, IP, and ATM MPLS Features

Voice, IP, and ATM MPLS Features

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: May 17, 2002.

Voice Over ATM Services on the VISM

A Cisco MGX 8850 Wide-Area Edge Switch, when equipped with one or more VISM cards, can transport digitized voice signals across a packet network while providing voice quality and reliability equal to the quality expected on the public telephone network. By transporting the voice traffic over ATM packet networks instead of traditional time-division multiplexing (TDM) networks, you realize considerable savings in network bandwidth requirements. Thus, the VISM/MGX 8850 combination provides an interface or voice gateway between conventional voice TDM networks and networks based on packet-switching technology.

The MGX network supports VISM-to-ATM connections. The primary use of this type of connection is to provide interworking with Cisco 3810 voice services.

Figure 22-8 shows an example of VISM and 3810 voice interworking.

Figure 22-8 VISM and Voice Interworking

Follow these steps to create Voice over ATM (VoATM) services in the MGX network on VISM:

Step 1

Type dspvismparam and confirm that the VISM mode is aal2Trunking. If it isn't, type cnfvismmode 2. This outputs the VISM voice mode and changes the voice mode to AAL2 trunking.

Step 2

Type dsplns. This outputs summary information for all lines on the card. Confirm that the line you want to use is enabled and free of alarms.

Step 3

Type dspln <line number> and verify the line signaling type. If you need to change it, use the cnflnsig command. This outputs the line configuration and changes the signaling type.

Step 4

Type dspport. If no port exists, type addport. This outputs the port information and creates a new logical port between the VISM and the PXM1.

Step 5

Type dsprscprtn. If no resource partitions exist, type addrscprtn 1. This outputs the resource partition information and creates a new portable AutoRoute (PAR) resource partition on the port.

Step 6

Type dsplndsp <line number> and review the digital signal processor (DSP) configuration. If you want to make any changes, use the cnfecanenable, cnfecanrec, cnfecantail, or cnfcompvad commands. This outputs the line DSP configuration and changes the line echo cancellation and VAD settings.

Step 7

Type dspendpts to identify an endpoint. If the endpoint you want to use is not listed, use the addendpt or addendpts command to create new endpoints. This outputs a list of all endpoints on the VISM and adds one or more new endpoints.

Step 8

Type dspendpt <endpoint number> and verify that the endpoint is using the appropriate line and timeslot. This outputs the endpoint configuration.

Step 9

To add a local connection, type addcon <local VCI> <preference> <PVC type> <application> <PCR>. Go to Step 11 and note the connection ID.

Step 10

To add a feeder connection, type addcon <local VCI> <preference> <PVC type> <application> <PCR> <mastership> [remote connection ID], specifying the PXM1 trunk in the remote connection ID. This creates a new master connection.

Step 11

Type dspcons and dspcon <channel number> and verify the connection configuration. This outputs the connection status and configuration information.

Step 12

Type addcid <endpoint number> <LCN> <CID number> <codec type> [profile type] [profile number] [VAD] [VAD initialization timer] [echo cancellation] [triple redundancy protection] [CAS transport] [DTMF transport] [ICS] [packet period], specifying the endpoint and connection channel number (LCN) you identified in Step 7 and Step 9 or 10. This creates a CID on the connection.

Step 13

If multiple CIDs are using the same connection, repeat Step 12 for each CID. Specify the same LCN and a different CID and endpoint. This creates additional CIDs.

Step 14

Log into the remote VISM if you are adding a local connection and type cc <card slot>. This transfers the CLI to another card slot.

Step 15

Repeat Steps 1 through 8. This configures the VISM, line, and endpoint(s).

Step 16

If you are adding a local connection, type addcon <local VCI> <preference> <PVC type> <application> <PCR> <mastership> [remote connection ID], specifying the remote connection ID you noted in Step 9. Then go to Step 18. This creates a master connection.

Step 17

If you are adding a feeder connection, type addcon <local VCI> <preference> <PVC type> <application> <PCR> <mastership> [remote connection ID], specifying the PXM1 trunk in the remote connection ID. This creates a master connection.

Step 18

Complete Steps 11 through 13 on this VISM. This adds one or more CIDs.

Step 19

If you have a BPX backbone network, log into the BPX switch attached to one of your MGX switches. Type addcon <local channel> <remote node> <remote channel> <connection class | connection type> [connection parameters] [route avoid] to add an ATM routing connection through the BPX network. Be sure to match the VPI and VCI values in the BPX network with the values you used when you added the MGX connection segments. Use the dspcons and dspcon commands to verify the connection status. Proceed to Step 21.

Step 20

If you have an MGX 8850-PXM45 backbone network, log into the AXSM on the local switch and type addcon <interface number> <vpi> <vci> <service type> 2 [parameters], where 2 indicates the slave endpoint. Be sure to write down the endpoint ID (NSAP address, VPI, and VCI). Log into the AXSM on the remote switch and type addcon <interface number> <vpi> <vci> <service type> 1 <-slave slave endpoint ID> [parameters], where 1 indicates the master endpoint and the slave endpoint ID is as previously noted. This adds a routing connection through the MGX 8850-PXM45 network. Use the dspcons and dspcon commands to verify the connection status.

Step 21

Use the tstcon or tstdelay command to verify connectivity. This tests end-to-end connectivity in the network.

Step 22

Type dspconcnt <channel number> and dspmngcidcnt <CID> and verify that there is traffic. This outputs connection and CID statistics counters.

Step 23

Log into the original VISM and repeat Steps 21 and 22. This confirms that the connection and CID are functioning correctly at the other end.

Step 24

Type bye. This logs you off the CLI.


You have completed the steps necessary to create Voice over ATM (VoATM) services in the MGX network on VISM.

9. Digital Signal Processors | Next Section Previous Section

Cisco Press Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from Cisco Press and its family of brands. I can unsubscribe at any time.

Overview

Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Cisco Press products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites; develop new products and services; conduct educational research; and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@ciscopress.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security

Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children

This site is not directed to children under the age of 13.

Marketing

Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out

Users can always make an informed choice as to whether they should proceed with certain services offered by Cisco Press. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.ciscopress.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links

This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020