[cisco-voip] ISDN Bad Frame

[Mark Holloway]

I'm trying to get this lab ISDN configuration up and running but I am having ISDN problems.  I have two 2811 routers each with a VWIC 2MFT-T1 and a T1 crossover cable connecting them.  They won't move from TEI_ASSIGNED to MULTIPLE_FRAME_ESTABLISHED.  I know my T1 cable is good. 

# debug isdn q921

Dec  4 20:57:58.250: ISDN Se0/0/0:23 Q921: User RX <- BAD FRAME(0x00017F)
Dec  4 20:57:59.250: ISDN Se0/0/0:23 Q921: User RX <- BAD FRAME(0x00017F)
Dec  4 20:58:00.250: ISDN Se0/0/0:23 Q921: User RX <- BAD FRAME(0x00017F)


# show isdn status

Global ISDN Switchtype = primary-ni

%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not apply

ISDN Serial0/0/0:23 interface
	dsl 0, interface ISDN Switchtype = primary-ni
	L2 Protocol = Q.921 0x0000  L3 Protocol(s) = CCM MANAGER 0x0003 
    Layer 1 Status:
	ACTIVE
    Layer 2 Status:
	TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED


# show run | sec controller
controller T1 0/0/0
 framing esf
 linecode b8zs
 cablelength short 133
 pri-group timeslots 1-3,24 service mgcp
 description PRI

# show run | sec Serial
interface Serial0/0/0:23
 description PRI
 no ip address
 encapsulation hdlc
 isdn switch-type primary-ni
 isdn incoming-voice voice
 isdn bind-l3 ccm-manager
 no cdp enable


The "PSTN" router

controller T1 0/0/0
 clock source internal
 cablelength short 133
 pri-group timeslots 1-3,24
 description PRI

interface Serial0/2/0:23
 description PRI
 no ip address
 encapsulation hdlc
 isdn switch-type primary-ni
 isdn incoming-voice voice
 isdn bchan-number-order ascending 
 no cdp enable

PSTN#deb isdn q921
debug isdn q921 is		ON.
PSTN#term mon
PSTN#
Dec  4 21:54:51.090: ISDN Se0/0/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Dec  4 21:54:55.590: ISDN Se0/2/0:23 Q921: L2_EstablishDataLink: sending SABME
Dec  4 21:54:55.590: ISDN Se0/2/0:23 Q921: User TX -> SABMEp sapi=0 tei=0
Dec  4 21:54:56.590: ISDN Se0/2/0:23 Q921: User TX -> SABMEp sapi=0 tei=0
Dec  4 21:54:57.090: ISDN Se0/0/0:23 Q921: L2_EstablishDataLink: sending SABME
Dec  4 21:54:57.090: ISDN Se0/0/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0
Dec  4 21:54:57.590: ISDN Se0/2/0:23 Q921: User TX -> SABMEp sapi=0 tei=0
Dec  4 21:54:58.090: ISDN Se0/0/0:23 Q921: Net TX -> SABMEp sapi=0 tei=0



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