Accepted Solutions
Hi Manzoor, Please check step 14 of the "Configuring the T1/E1 HWICs or Network Module" of the
following link
http://www.cisco.com/c/en/us/td/docs/ios/12_4/12_4x/12_4_11xw/fmt1e1ic_voice.html
Note 
Default is with no voice-dsp option. Current "Service" is only for voice mgcp. So, when "Service" is selected, there is no "voice-dsp" required or needed. For 1-Port and 2-Port HWIC voice support, user must select voice-dsp.
Note The option keyword or voice-dsp is only available to the 1-Port and 2-Port HWIC on ISR-G2 (Cisco 2911, Cisco 2921, Cisco 2951, Cisco 3925, Cisco 3925E, Cisco 3945, and Cisco 3945E).
•If a controller is configured as PRI, individual channel groups cannot be configured on that controller.
•The controller command must be entered before this command can be used.
Pri-group timeslots 1-16 service mgcp enables these channels to be used for mgcp.
Manish
Hi Manzoor, Please check step 14 of the "Configuring the T1/E1 HWICs or Network Module" of the
following link
http://www.cisco.com/c/en/us/td/docs/ios/12_4/12_4x/12_4_11xw/fmt1e1ic_voice.html
Note Default is with no voice-dsp option. Current "Service" is only for voice mgcp. So, when "Service" is selected, there is no "voice-dsp" required or needed. For 1-Port and 2-Port HWIC voice support, user must select voice-dsp.
Note The option keyword or voice-dsp is only available to the 1-Port and 2-Port HWIC on ISR-G2 (Cisco 2911, Cisco 2921, Cisco 2951, Cisco 3925, Cisco 3925E, Cisco 3945, and Cisco 3945E).
•If a controller is configured as PRI, individual channel groups cannot be configured on that controller.
•The controller command must be entered before this command can be used.
Pri-group timeslots 1-16 service mgcp enables these channels to be used for mgcp.
Manish
