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In fact it turned out that it is possible to migrate psk without knowing ASCII PSK and decrypt passwords/keys from Cisco AireOS WLC configuration. The AES key was published in 2014, but most probably it was extracted earlier.
https://github.com/kuzmi...
Moussa, you have mentioned you need router to support 150 or more IP phone users. Are you planning to register IP phones on ISR (CME) ?
Cause 2951 supports up to 150 IP phones maximum (SCCP or SIP), and recommended to have 1Gb RAM/256Mb flash in this...
