To make use of DSP resources for a Conference Call, we will have to enable Conference Bridge at the gateway.
Configure the following at the gateway:
voice-card 0
dspfarm
dsp services dspfarm
sccp local Loopback0
sccp ccm 10.10.210.10 identifier 2 priority 2 version 5.0.1
sccp ccm 10.10.210.11 identifier 1 priority 1 version 5.0.1
sccp
!
sccp ccm group 1
bind interface Loopback0
associate ccm 1 priority 1
associate ccm 2 priority 2
associate profile 1 register HQ-conf << Name must match at CUCM
!
dspfarm profile 1 conference
codec g729r8
maximum sessions 2
associate application SCCP
no shut << Very Important
At CUCM under Media Resources > Conference Bridge
After adding the Conference Bridge, add it under Media Resource Group and then to MRGL.
Add the MRGL under particular device pool or Gateway.
Verification:
Show sccp conn
show dspfarm all
voiceonbits.com 
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