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Chapter 1
Overview of the VISM and VISM-PR Cards
Voice over ATM (VoATM) using AAL2 cells—No Logical Link Control/Subnetwork Access
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Protocol (LLC/SNAP) encapsulation.
Note
VoIP using AAL5 cells to RFC 1889.
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Extended Superframe (ESF) framing with or without cyclic redundancy check (CRC).
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Pulse code modulation (PCM) A/Mu law codecs.
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Programmable 24, 32, 48, 64, 80, 96, 112, 128 ms tail delay near end ECAN.
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Voice compression with the following standards:
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Note
Nx64 clear channel (N = 1 only) support.
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Voice activity detection (VAD) and comfort noise generation (CNG) using variable threshold energy
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(Cisco proprietary).
Call agent Simple Gateway Control Protocol (SGCP) Version 1.0, 1.1, 1.5, SGCP 1.1+, 1.5, and
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Media Gateway Control Protocol (MGCP) 0.1 and 1.0.
Backhauling channel associated signaling (CAS) signaling to a call agent using xGCP (backhauling
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can be accomplished with any supported SGCP and MGCP protocol).
Backhauling Primary Rate Interface (PRI) signaling via Reliable User Datagram Protocol (RUDP)
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to a call agent.
Common channel signaling (CCS) transport across an AAL5 trunk.
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Fax and modem VoIP bearer transmissions.
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Dual (redundant) virtual circuits across the packet network.
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Full continuity testing (COT). Supports origination and terminating loopback and transponder COT
between VISM and the central office on the TDM side.
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Loop timing, which can be used as the master clock for the entire MGX 8000 Series platform and
local clock.
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Multiplexing is not supported for AAL2 SVCs.
G.711
G.726-16k
G.726-24k
G.726-32k
G.726-40k
G.729a
G.729ab
G.723.1-H
G.723.1a-H
G.723.1-L
G.723.1a-L
The G.723.1 codecs are not supported in combination with the VISM card. The G.723.1
codecs are supported with the VISM-PR card.
VISM and VISM-PR Card Features
Cisco VISM Installation and Configuration Guide
1-7
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