CISCO Eircom BRI Voice Config

Cryos

Hi all,

I have been struggling with an issue in our Cisco 1861 Router for a while now. Calls coming into the ISDN (standard eircom bri 2 channel isdn) are not being answered by the router. Calls outbound drop after a few seconds

If i intermittently play around with Static-tei 0 and tei-negotiation first-call calls will work for a time but then stop again.

Anyone have a working config for Eircom BRI ISDN VOICE ?

interface BRI0/1/0
 description ISDN1
 no ip address
 isdn switch-type basic-net3
 isdn tei-negotiation first-call
 isdn point-to-point-setup
 isdn incoming-voice voice
 isdn static-tei 0
!
interface BRI0/1/1
 description isdn2
 no ip address
 isdn switch-type basic-net3
 isdn tei-negotiation first-call
 isdn point-to-point-setup
 isdn incoming-voice voice
 isdn static-tei 0

Anyone any ideas ?

Start of outgoing call before drop:

ISDN BRI0/1/0 interface
        dsl 2, 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 2 CCBs = 0
    The Free Channel Mask:  0x80000003
ISDN BRI0/1/1 interface
        dsl 3, 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=8116, sapi=0, ces=1, B-chan=1, calltype=VOICE
    Active dsl 3 CCBs = 1
    The Free Channel Mask:  0x80000002
    Total Allocated ISDN CCBs = 1

After 5 seconds call drops:

Global ISDN Switchtype = basic-net3
ISDN BRI0/1/0 interface
        dsl 2, interface ISDN Switchtype = basic-net3
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Active dsl 2 CCBs = 0
    The Free Channel Mask:  0x80000003
ISDN BRI0/1/1 interface
        dsl 3, interface ISDN Switchtype = basic-net3
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Active dsl 3 CCBs = 0
    The Free Channel Mask:  0x80000003
    Total Allocated ISDN CCBs = 0

Cuddlesworth

Sounds like a timeout. Any firewall added recently, blocking traffic into the router itself rather than the ISDN line.

rmacm

Try a debug isdn 921 (I think that's the correct command but it has been a while since I did anything with ISDN interfaces)...if you don't get any output at the console try make a call to generate output.

Usually a change on the Layer 2 status from Multiple_Frame_Established to TEI_Assigned indicates some sort of problem at L2.

Cryos

It was actually something incredibly simple.

I had two cables going from the ISDN Ports into the BRI Ports, Disconnect one and the issue was resolved. I cleaned up the config to remove the static-tei and tei neg.

The clue was in the console when dialing out or receiving that BRI0/1/0 and BRI0/1/1 both came up.