Hi
If you are using CUCM 8.0, the following Cisco IOS MGCP gateways are supported. Once if you get the following Gateways as drop-down, choose one and then
you can able to configure the switch-type. My understanding is 2911 is not supported in CUCM 8.0.
Adding a Cisco IOS MGCP Gateway
Use the following procedure to add and configure a Cisco IOS MGCP gateway to Cisco Unified Communications Manager. The following Cisco IOS gateways support MGCP:
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CiscoVG200 Voice Gateway
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VG224 Gateway
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Cisco IOS 362x, 364x, 366x Gateways
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Cisco IOS 3725 and 3745 Gateways
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Cisco IOS 26xx and 269x Gateways
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Cisco 2801, 2811, 2821, 2851, 3825, 3845 Gateways
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Cisco Catalyst 4000 Access Gateway Module
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Cisco Catalyst 4224 Voice Gateway Switch
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Communication Media Module
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Cisco IAD2400 gateways
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_0_1/ccmcfg/b06gtway.html#wp1646962
You may stuck bcoz of the Gateway selection. Once your Gateway configuration is done, then i think you can do your ISDN Switch-type configuration aswell.
Here's the link for ISDN Switch-type support in CUCM 8.0
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_0_1/ccmcfg/b06gtway.html#wp1641599
Thanks.