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Notes

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The Survivable Media Gateway (SMG)

adds redundancy for both IP sets and

Media gateways (and hence TDM

resources) in the CS1K system. SMG’s

must be on a network with less that an

80ms round trip delay to the Call server

and less than 0.05% packet loss.

Up to 50 media gateways can be

defined on a Call server and in theory all

of them can be configured with a

survivable node.

In essence each SMG has a CS1K

system of its own, i.e. a Call server

(CS) and Sig Server (SS) so calls can

continue to be processed. The SMG

CS/SS unit is configured with a Node ID

identical to the Main Office (MO) but of

course the IP addressing will be

different. The database from the MO is

periodically copied to the SMG to keep it

current.

In normal operation sets are configured

(S1) to point to the redundant node

where they momentarily register before

being forwarded to the MO. Media

Gateways also register to the MO.

When the MO is unavailable IP sets

remain registered to the SMG and gain

service from it. In addition the MGC’s

reboot and re-register to the SMG for

service. This is known as Local Mode.

CS 1000 Rel 7.5 16/04/2013

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Boots CS-1000 Bedienungsanleitung Seite 368

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