[cisco-voip] CUCM6 MCS to 8.6 UCS bridged upgrade Question

[Boon]

Thanks for the info all.

One further question. The customer has multiple branch locations each with
a voice gateway containing IOS Enhanced Media Resources for transcoder,
conf bridge, MTP and also SRST.

The CUCM IOS Compatibility matrix states that the minimum supported IOS is
15.1(4)M1. This is to provide SRST version 8x and SCCP ccm version 8x.

More than half of their gateways do not have enough DRAM and Flash to
support 15.1(4)M1. The requirements is 512/128.

To upgrade all of these gateways it will cost a considerable amount of
money.

Is it crucial that they're upgraded prior to the upgrade? Will the media
resources be affected if left on the current IOS with only 6.1(3) support?

I think I know the answer but would like a 2nd opinion.

Thanks
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