UCx supports up to 16 Media Gateways. This could be a combination of MGC and MGXPEC type gateways.
The different types of gateway cabinets are:
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M1 Option 11 cabinet (10 card, NTAK11)
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M1 Option 11 mini main chassis (4 card, NTDK91)
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MG 1000E chassis (4 card, NTDU14)
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MG1010 cabinet (10 card, NTC310)
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MGXPEC Universal Equipment Module (UEM) NT8D37
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MG 1000E expansion chassis (4 card, NTDU15) (This cabinet connects to the MG 1000E chassis and does not count as one of the 16 Media Gateways)