If it ain’t broke don’t fix is an addage that the telecom industry has well and truly applied to the SS7 space.
If you’ve got an SS7 network (especially one built on TDM links) the general philosophy is don’t touch it and hope to retire before it dies.
The Cisco STP (Internet Transfer Point) is a good example of this, and for that reason I still work on them.
But OpenSSH and standards have moved on, and SSHing into them these days requires some extra (insecure) parameters to access, so here they are:
ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 -oHostKeyAlgorithms=+ssh-rsa -caes128-cbc [email protected]
Will get you into an Version 12.3(4r)T4 Cisco ITP. Be sure to run sho ver and marvel at that uptime!