Explanation/Reference:
Table 6-2 DSP Resources on Cisco IOS Hardware Platforms with C5510 Chipset Hardware Module or Chassis
DSP Configuration
Maximum Number of Voice Terminations (Calls) per DSP and per Module Medium Complexity (8 calls per DSP)
High Complexity
(6 calls per DSP)
Flex Mode1
(240 MIPS per DSP)
VG-224
Fixed at 4 DSPs
N/A
24 calls per platform
Supported codecs:


G 711 (a-law, mu-law)
G 729a
N/A
NM-HD-1V2
Fixed at 1 DSP
4 calls per NM
4 calls per NM
240 MIPS per NM
NM-HD-2V
Fixed at 1 DSP
8 calls per NM
6 calls per NM
240 MIPS per NM
NM-HD-2VE
Fixed at 3 DSPs
24 calls per NM
18 calls per NM
720 MIPS per NM
NM-HDV2
NM-HDV2-2T1/E1
NM-HDV2-1T1/E1
1 to 4 of:
PVDM2-83 (½ DSP)PVDM2-16 (1 DSP)PVDM2-32 (2 DSPs)PVDM2-48 (3 DSPs)PVDM2-64 (4 DSPs) Calls per PVDM:
48162432
Calls per PVDM:
36121824
MIPS per PVDM:
120240480720960
Reference: http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/4x/42media.html