ISDN PRI Problem!

Unanswered Question
Aug 17th, 2007

Hi all,

I have a Cisco 2821 router with VWIC2-2MFT-E1/T1 to connect to PSTN via E1 PRI. I think that all the configurations are OK (as I had done a case before and the configurations are the same) but Layer 2 cannot go to MULTIFRAME_ESTABLISHED.

Could anyone give me some explains or instructions.

Thanks and regards,

hoanghiep

The configurations:

########################

card type e1 0 0

!

no aaa new-model

!

resource policy

!

network-clock-participate wic 0

!

isdn switch-type primary-net5

!

voice-card 0

no dspfarm

!

controller E1 0/0/0

framing NO-CRC4

pri-group timeslots 1-24 ##I have also 8 FXO ports so there're enough DSP for only 24 timeslots### (same thing for the already-running-system I mentioned above)

!

interface Serial0/0/0:15

no ip address

encapsulation ppp

isdn switch-type primary-net5

isdn incoming-voice voice

keepalive 10 3

no cdp enable

###########

show isdn status

Global ISDN Switchtype = primary-net5

ISDN Serial0/0/0:15 interface

dsl 0, interface ISDN Switchtype = primary-net5

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 0, Ces = 1, SAPI = 0, State = AWAITING_ESTABLISHMENT

Layer 3 Status:

0 Active Layer 3 Call(s)

Active dsl 0 CCBs = 0

The Free Channel Mask: 0x80FF7FFF

Number of L2 Discards = 0, L2 Session ID = 190

#############

debug isdn q921

*Aug 18 04:57:26.575: ISDN Se0/0/0:15 Q921: L2_EstablishDataLink: sending SABME

*Aug 18 04:57:26.575: ISDN Se0/0/0:15 Q921: User TX -> SABMEp sapi=0 tei=0

*Aug 18 04:57:27.575: ISDN Se0/0/0:15 Q921: User TX -> SABMEp sapi=0 tei=0

*Aug 18 04:57:28.575: ISDN Se0/0/0:15 Q921: User TX -> SABMEp sapi=0 tei=0

*Aug 18 04:57:29.575: ISDN Se0/0/0:15 Q921: User TX -> SABMEp sapi=0 tei=0

I have this problem too.
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Majdi Harb Sat, 08/18/2007 - 00:11

i think u have to check from Telco side to make sure ur PRI is ready and activated from their side.

i had like this before and it was a Telco issue.

hth

/majdi

2smith Mon, 08/20/2007 - 01:39

Hello

Have you tried changing the CRC4 in the framing - in the UK we use CRC4.

Avner Izhar Tue, 08/21/2007 - 19:52

Hi,

Put 'encapsulation hdlc' instead of the encapsulation ppp you have, reload and you should be fine.

HTH, Avner.

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