Calling from 3Com LAN modem to Cisco 3640 with isdn pri, Cisco ACS and callback enabled. The router and ACS work fine with cisco dial in (2600), callback will not result when using 3com lan modem. Seen bug ID CSCdx81130 and upgraded to 12.2(17) to no affect.
Here is output from debug cbcp, as you can see the response has an additional byte, this causes nas to request callback again, and so on until it gives up. Any ideas?
00:49:45: Se3/0:0 MCB: User test1 Callback Number - Server (DN Removed for security>
00:49:45: Serial3/0:0 PPP: O MCB Request(1) id 31 len 7
00:49:45: Serial3/0:0 MCB: O 1 1F 0 7 3 3 0
00:49:45: Se3/0:0 MCB: O Request Id 31 Callback Type Server-Num delay 0
00:49:45: Serial3/0:0 PPP: I MCB Response(2) id 31 len 8
00:49:45: Serial3/0:0 MCB: I 2 1F 0 8 3 4 5 0
00:49:45: Se3/0:0 MCB: Received response
00:49:45: Se3/0:0 MCB: Response CBK-Server-Num 3 4 5
00:49:45: Se3/0:0 MCB: Response for CBK-Server-Num has extra data 1 bytes 0x0 0x0x0 0x0
