PRI B-channel always restart

ericng

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May 14, 2008
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#1
I am having 2 PRI cards installed (one TE121, one TE120P) as follows:

; Span 1: WCT1/0 "Wildcard TE121 Card 0" (MASTER) HDB3/CCS/CRC4
group=0,11
context=dnid-custom2
switchtype = euroisdn
signalling = pri_cpe
channel => 1-15,17-31
context = default
group = 63

; Span 2: WCT1/1 "Wildcard TE120P Card 1" HDB3/CCS/CRC4
group=0,12
context=dnid-custom
switchtype = euroisdn
signalling = pri_cpe
channel => 32-46,48-62
context = default
group = 63

I noted the B-channel for span 1 restarted every hour (when this happen, I will have calls drop or blank voice), is there anything that I can do to resolve this?

Thanks and Regards,

Eric
 

hylan

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#2
By default the pri's will reset every hour. To disable it just add resetinterval=never to your current config.
 

ericng

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#3
Hi Hylan,

Thanks for the help. It works. BTW, what is the purpose of having pri's restarted.

After settinf resetinterval=never, I still get the message 'B-channel restarted on span 1' but is not often, do you think this is a carrier provider's problem?
 

hylan

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#4
I'm not sure why they restart the PRI channels but some service providers and PABX's have this issue. Glad it's working now.
 

ramoncio

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#5
Hi Eric,

If you want to remove these messages, add
bri_l1_check=0
to your chan_dahdi.conf

The thing about restarting the channels is because here in Spain, Telefonica shuts down ISDN BRI layer 2 for power saving purposes. And if you don't set the resentinterval=never, you can't make outgoing calls until you receive a call that turns layer 2 on. Restarting the channels solves this problem.
 

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