Part III: Cisco Unified Communications Manager (CUCM)
Step 2-3: Create the MGCP Gateway in CUCM
On the Cisco Unified CM Administration page, navigate to Device > Gateway.
1. Click the Add New button.
2. From the Gateway Type drop-down list, select your router model and click the Next button.
3. From the Protocol drop-down list, select MGCP and click the Next button.
4. Enter the FQDN of the router (as noted in Step 2-2) in the Domain Name field. (Make sure that the case of the letters matches the entries on the router exactly.)
5. Enter HQ MGCP Gateway in the Description field.
6. From the Cisco Unified Communications Manager Group drop-down list, select Single Server.
7. In the Configured Slots, VICs and Endpoints section, select the hardware where the T1/PRI interface is located. The selection can seem a bit strange at first. For example, if you have a 2811 router with a T1/PRI on VWIC card, the 2811 has four onboard slots, so from the Module in Slot 0 drop-down list, select NM-4VWIC-MBRD (which says there are four VWIC slots on the motherboard, even though you will not see the individual VWIC slots until after you save the gateway configuration). If your router has a T1/PRI on a network module, select the module from the Module in Slot 1 drop-down list.
8. To match the PSTN Simulator, in the Product Specific Configuration Layout section, from the Global ISDN Switch Type drop-down list, select NI2. See Figure 10-4 for an example of this page.
Figure 10-4. Creating an MGCP Gateway
9. Click the Save button to create the gateway. You should see a pop-up window telling you to click the Apply Config button, but the button is not active at this time.
10. Click OK to close the pop-up window.
11. With the gateway configuration saved, if you are using a VWIC, the subunits under the Module in Slot 0 field are now present. From the correct subunit (where the VWIC is installed) drop-down list, select your VWIC type and, if necessary, the mode (for cards that operate as a T1 or E1). In Figure 10-5, a 2811 router with a VWIC2-1MFT-T1/E1 card in HWIC slot 2 needs to be selected as VWIC2-1MFT-T1E1-T1 to operate in T1 mode instead of E1.
Figure 10-5. MGCP Gateway Configuration
12. Click the Save button to create the gateway. You should see a pop-up window telling you to click the Apply Config button.
13. Click OK to close the pop-up window.
14. After the configuration is saved, an icon of a telephone jack with a yellow question mark will show next to the subunit or module. See Figure 10-5 for an example of this page.
15. Click the icon of a telephone jack with a yellow question mark to configure the interface.
16. The Find and List Gateway page will open. From the Device Protocol drop-down list, choose Digital Access PRI and click the Next button.
17. The Gateway Configuration page will open to show the details for the interface. Notice that the End-Point Name field shows the port name and the FQDN of this interface (for example, S0/SU2/DS1-0@RtrPod11.soi.local, as shown in Figure 10-6).
Figure 10-6. Gateway Configuration – Part 1
18. From the Device Pool drop-down list, select Madison DP. See Figure 10-6 for an example of the top of this page.
19. Scroll down to the Interface Information section. If your PSTN Simulator is using fractional PRI (not all 23 channels active—which is likely, because of DSP resources), change the Channel Selection Order drop-down list to Top Down (or see the note regarding fractional PRIs).
Note
CUCM assumes that you are using full PRI circuits (all 23 voice channels), rather than fractional PRIs. By changing the Channel Selection Order field to Top Down, the PRI will start with the lowest channel number.
Another option is to limit the voice channels to the number configured by the PSTN by signaling that the unused channels are busy. The Cisco document “Busy-Out ISDN B-Channels in Cisco CallManager Configuration Example” shows how to configure this method. However, this is more of a troubleshooting solution, as only five devices in the system can be configured with this process.
20. Select the Enable status poll check box.
21. Under the Call Routing Information – Inbound Calls section, from the Significant Digits drop-down list, select 4.
22. In the Call Routing Information – Outbound Calls section, from the Calling Party Presentation drop-down list, select Allowed (to allow caller ID information). See Figure 10-7 for an example of the middle of this page.
Figure 10-7. Gateway Configuration – Part 2
23. In the PRI Protocol Type Specific Information section, select the Display IE Delivery check box (to allow the ISDN PRI caller ID info).
24. Select the Redirecting Number IE Delivery – Outbound check box. See Figure 10-8 for an example of the lower- middle portion of this page.
Figure 10-8. Gateway Configuration – Part 3 25. Click the Save button to commit the changes.
26. Click OK to close the pop-up window.
27. With the Related Links drop-down list set to Back to MGCP Configuration, click the Go button.
The icon of a telephone jack next to the port should not have a yellow question mark anymore; instead there should be “T1PRI” under the jack icon in tiny, red letters. This indicates that the jack for the router has been correctly configured.