Cisco Cisco IOS Software Release 12.3(11)T
IP Communications Voice/Fax Network Module
Information About the IP Communications Voice/Fax Network Module
3
Cisco IOS Release 12.3(11)T2
•
Software-based echo cancellation up to 32-millisecond conversion
•
Digital: BRI, PRI, and CAS
•
Analog: FXS, FXO, E&M, and DID
•
Signaling channel allocation
•
Voice channel allocation
•
Voice port independent channel allocation
•
Hairpinning:
–
Digital to digital (same card)
–
Analog to digital (same card)
•
Channel bank support—Analog voice ports are internally connected to a DS0 time slot on a digital
T1/E1 interface. All the signaling is transparently sent between the analog voice port and DS0 time
slot, and will not be seen by the higher layer voice software.
T1/E1 interface. All the signaling is transparently sent between the analog voice port and DS0 time
slot, and will not be seen by the higher layer voice software.
•
DSP crash recovery
•
FXO and FXS Caller ID Type 1 and Type 2
•
Trunk alarm handling
IP Communications Voice/Fax Network Module Capabilities
provides information about the three network modules that support this feature.
Table 1
IP Communications Voice/Fax Network Module Capabilities
Module
DSPs
Number of Channels
T1/E1 Ports
Voice Interface Cards
(VICs)
(VICs)
Medium
Complexity
Complexity
High
Complexity Flex
Complexity Flex
NM-HD-1V
1
1.
Number of channels depends on the VIC module installed in the router, not the number of DSPs.
1
4
4
4
0
One 2- to 4-port VIC
NM-HD-2V
1
8
6
6 to 8
0
Two 2- to 4-port VICs
NM-HD-2VE 3
24
18
18 to 48
4
Two 2- to 4-port VICs or
one VIC and one T1/E1
interface VIC or
two T1/E1 interface VICs
one VIC and one T1/E1
interface VIC or
two T1/E1 interface VICs