Equipment Required
This lab uses the following equipment:
• Two Cisco routers with voice IOS
• Switch that supports voice VLANs
• Lab configuration from Lab 5-2, 5-3, 6-1, or 6-2 (see the scenario for details)
• Two or more IP Phones (desk phone or soft phone on PC or Windows VM) Optional hardware components (see the scenario for details):
• Cisco router configured as PSTN simulator
• T1/E1/PRI Multiflex Trunk VWIC cards or Network Modules (see the scenario for details)
• Analog Foreign eXchange Station (FXS) cards
• Analog Foreign eXchange Office (FXO) cards
• DSP resources in the routers (PVDM chips) to enable the Multiflex Trunk and FXS or FXO ports Learning Objectives
Upon completion of this lab, you will be able to
• Configure dial peers to connect to the PSTN
• Configure dial peers to connect to remote offices using the WAN
• Configure failover for calls to remote offices using the PSTN when the WAN is down Scenario
SOI wants to connect to customers using the PSTN, and to remote branch offices of the company using the WAN. To avoid WAN failure from disabling four-digit dialing between locations, call failover from the WAN to the PSTN needs to be configured.
Note
Cisco has recorded screen casts for configuring various items using CCP at
www.cisco.com/en/US/docs/net_mgmt/cisco_configuration_professional/scrcst/ccpsc.html.
Note
For T1/E1 connectivity, CCP currently supports only voice interface cards VWIC2-1MFT-T1/E1 and VWIC2- 2MFT-T1/E1 and network modules NM-HDV2-1T1/E1 and NM-HDV2-2T1/E1. Older Multiflex cards, such as the VWIC-1MFT-T1, VWIC-1MFT-E1, VWIC-2MFT-T1, and VWIC-2MFT-E1, are not recognized and cannot be configured in CCP.
This lab has options for various hardware and notes the impacts each has on the configuration. Listed in order of best case to most limited, the hardware options are as follows:
• Option 1: Two (or more) pods with the PSTN simulator (see Appendix E) and an Ethernet connection to simulate the WAN, as shown in Figure 6-12. This option allows you to complete all parts of the lab.
Figure 6-12. Topology Diagram Option 1: Two Pods and PSTN Simulator
• Option 2: One pod with the PSTN simulator (see Appendix E), as shown in Figure 6-13. This will allow you to complete
Tasks 2 to 7, but not test the VoIP dial peers (Task 7) or PSTN failover (Task 8). If you are able to reconfigure the PSTN simulator as another pod, you could complete the WAN links (Task 7) separately.
Figure 6-13. Topology Diagram Option 2: One Pod and PSTN Simulator
• Option 3: Two pods directly connected with digital or analog interfaces, as shown in Figure 6-14. This will allow you to set up another pod to be a simplistic PSTN simulator so that you can complete Tasks 2 to 7, but not be able to test the PSTN dial peers (Tasks 4 and 5). Additionally, if you are using FXO-to-FXS interfaces, you will not be able to test Task 6 (inbound dial peers).
Figure 6-14. Topology Diagram Option 3: Two Pods with Digital Interfaces and Ethernet Connection Task 1: Load Prior Configurations
This lab is based on the configuration from Lab 5-2, 5-3, 6-1, or 6-2. If necessary, load the configuration for both the switch and router.
Connect a PC to the switch and verify that it can ping the router and switch management addresses. Connect the VoIP phones and verify that you can call between them. Troubleshoot if necessary.
Task 2A: Configure Digital T1/E1/PRI Interface
If you are using a T1/E1/PRI interface (see the note in the scenario) that has not been configured, follow these directions. If you are using analog FXO with FXS interfaces, skip ahead to Task 2B.
Step 2A-1: Digital Trunks
Use the community created in Lab 4-1, Step 3 to connect to the router. With the router discovered, click Configure. The pane on the left will show various categories of router configuration options. (The items you see will depend on the IOS you have installed.) Click the Unified Communications folder icon to expand the subitems.
Click the Trunks folder icon to expand the subitems, and click the Digital Trunks subitem. In the Digital Trunks pane on the right is a table showing any T1/E1 interfaces. See Figure 6-15 for an example of this window. If you do not see any items, verify that you have a compatible interface and check the note in the scenario.
Figure 6-15. Digital Trunks
Click to highlight the desired trunk (if there is more than one) and then click the Edit button at the bottom of the window.
Step 2A-2: T1/E1 Interface
The T1/E1 Interface window will open to the T1/E1 Settings tab.
1. Select the Type radio button to change between T1 or E1 (if needed).
2. Enter PSTN in the Description field.
3. Change the Timeslots To field if needed. (The PSTN simulator in Appendix E is configured for six channels on the PRI.) See Figure 6-16 for an example of this window.
Figure 6-16. Digital T1/E1 Settings
Note
If you are configuring Option 3 only, configure the PRI the same on the remote pod, but then click the PRI Settings tab and change the Clock Type radio button to Source (Network or NT) for the remote pod only.
This is the same as the CLI commands shown in Lab 6-2, Task 4.
4. Click OK.
Step 2A-3: Deliver Configuration from CCP to the Router
The Deliver Configuration to Device dialog box opens. See Figure 6-17 for an example of this window.
Figure 6-17. Deliver Configuration to Device Dialog Box Click Deliver to send the commands to the router.
Step 2A-4: Deliver Configuration from CCP to the Router
The Digital Trunks window shows the configured T1 or E1, as shown in Figure 6-18.
Figure 6-18. Digital Trunks Configured
Cable all pods using PRI crossover cables to the PSTN simulator (Option 1 or 2) or to the other pod (Option 3). See the note about T1 crossover cables in Lab 6-2, Step 2-2.
Task 2B: Configure Analog FXO/FXS Interfaces
If you are using a T1/E1/PRI interface, skip ahead to Task 3. If you are using analog FXO with FXS interfaces, follow these directions.
Step 2B-1: Analog Trunks
Use the community created in Lab 4-1, Step 3 to connect to the router. With the router discovered, click Configure. The pane on the left will show various categories of router configuration options. (The items you see will depend on the IOS you have installed.) Click the Unified Communications folder icon to expand the subitems.
Click the Trunks folder icon to expand the subitems, and click the Analog Trunks subitem. In the Analog Trunks pane on the right is a table showing any FXO and FXS interfaces. See Figure 6-19 for an example of this window.
Figure 6-19. Analog Trunks
There should be no configuration necessary, other than adding a description, as noted in Lab 6-1.
Task 3: Configure Secondary Dial Tone
When configuring a PBX-type dial plan, there needs to be an outside line access digit. Many PBX users are used to hearing a slightly different dial tone after dialing this digit, before dialing the intended PSTN number. This secondary dial tone for outside lines can be configured under the Unified Communications > Telephony Settings subitem.
Click the Edit button to open the Edit Telephony Settings dialog box. Enter 9 in the Secondary Dial-Tone Digit field. See Figure 6-20 for an example of this window.
Figure 6-20. Edit Telephony Settings
Click the OK button, and the Deliver Configuration to Device dialog box opens. Click Deliver to send the commands to the router.