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Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Chapter 2 Module and Service Descriptions
Frame Relay Service Modules
MGCP 0.1 for VoIP with Softswitch Control
VISM supports Media Gateway Control Protocol (MGCP) Version 0.1. This open protocol allows any
Softswitch to interwork with the VISM module.
Resource Coordination via SRCP
Simple Resource Control Protocol (SRCP) provides a heartbeat mechanism between the VISM and the
Softswitch. In addition, SRCP also provides the Softswitch with gateway auditing capabilities.
Full COT Functions
VISM provides the capability to initiate continuity test as well as provide loopbacks to facilitate
continuity tests when originated from the far-end.
Courtesy Down
This feature provides a mechanism for graceful upgrades. By enabling this feature, no new calls are
allowed on the VISM while not disrupting the existing calls. Eventually, when there are no more active
calls, the card is ready for a upgrade and/or service interruption.
PRI Backhaul to the Softswitch Using RUDP
The PRI backhaul capability provides PRI termination on the VISM with the Softswitch providing call
control. ISDN Layer 2 is terminated on the VISM and the layer 3 messages are transported to the
Softswitch using RUDP.
Latency Reduction (<60 ms round-trip)
Significant improvements have been made to bring the round-trip delay to less than 60 ms.
Codecs Preference
VISM provides the capability to have the codecs negotiated between the two end-points of the call. The
VISM can be configured, for a given end-point, to have a prioritized list of codecs. Codec negotiation
could be directly between the end-points or could be controlled by a Softswitch
31 DS0 for E1 with 240 Channels Only
While all 31 DS0s on a E1 port can be used, there is a limitation of 240 channels per card.
VISM Redundancy
The VISM redundancy strategy is the same as for any of the eight port cards in the MGX 8230.
• For VISM-8T1, 1:N redundancy is supported using the SRM-3T3.
• For VISM-8E1, 1:N redundancy is supported only via LMs using the SRM-3T3 or the SRM-T1E1.
Card Combinations
A card set has an VISM-8T1 or VISM-8E1 front card and one of the following back cards:
• AX-RJ48-8T1-LM
• AX-R-RJ48-8T1-LM (for redundancy support)
• AX-RJ48-8E1-LM
• AX-SMB-8E1-LM
• AX-R-SMB-8E1-LM (for redundancy support)