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fast connect and pstn fall back

What is the IOS version of AS5300 that support fast connect and pstn fall back?

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Anonymous
N/A

Re: fast connect and pstn fall back

Pstn fallback was introduced in 12.1(3)T

and fast connect as from 12.1(3)XI or 12.1(5)T.

I would advice to use any voice image in 12.2T train.

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