Ciao, il comando dovrebbe essere : sh caller full
Con questo comando il mio 2610 risponde :
Cisco2610#sh caller full
User: unknown, line vty 66, service VTY
Active time 00:12:43
Timeouts: Limit Remaining Timer Type
00:10:00 00:09:59 Idle Exec
VTY: Line 66, remote 192.168.1.2
Line: Baud rate (TX/RX) is 9600/9600
Status: PSI Enabled, Ready, Active, No Exit Banner
Modem State: Ready
User: <unknown phone number>, line Vi2, service PPPoATM
Connected for 1d04h, Idle for 00:00:00
Timeouts: Limit Remaining Timer Type
- - -
PPP: LCP Open, CHAP (->), IPCP
Dialer: Connected to <unknown phone number>, inbound
Type is DIALER PPPOA, group Di0
IP: Local xxxxxxxxxx/32, remote xxxxxxxxx
Counts: 405838 packets input, 288911312 bytes, 0 no buffer
0 input errors, 0 CRC, 0 frame, 0 overrun
272262 packets output, 58239065 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
e quindi alla linea PPP: si vede che l'autenticazione è CHAP