From MSN to DDI

I really hate when customer plays unfair – doing big change in services without notice. It was this time with approximatelly 30 remote offices each with 2 bri interfaces.

In the half of them we met an issue. Conections wasn’t established properly. After searches solution was to reconfigure bri interfaces as below

isdn tei-negotiation first-call
isdn tei-negotiation power
isdn tei-negotiation powerup
isdn static-tei 0

Important: clear interface

update: difference may look like below

ISDN BRI0/3/0 interface
dsl 12, interface ISDN Switchtype = basic-net3
Layer 1 Status:
DEACTIVATED
Layer 2 Status:
Layer 2 NOT Activated
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 12 CCBs = 0
The Free Channel Mask: 0x80000003
ISDN BRI0/3/1 interface
dsl 13, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 13 CCBs = 0
The Free Channel Mask: 0x80000003
Total Allocated ISDN CCBs = 0


and example how doesn’t look like during a call

ISDN BRI0/2/1 interface
dsl 9, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
CCB:callid=8052, sapi=0, ces=1, B-chan=1, calltype=DATA, hdlctype=HDLC-TRUNK
Active dsl 9 CCBs = 1
The Free Channel Mask: 0x80000002
Total Allocated ISDN CCBs = 1