09-21-2008 11:18 PM - edited 03-15-2019 01:26 PM
I have a 2851 with VIC2-2BRI cards connected to ISDN lines in Spain with a NET-3 European ISDN switch. The lines work fine for incoming calls, however the lines deactivate when there is no activity (which I know is normal). However when an outbound call is attempted to be places the caller just gets a fast-busy. The port appears to be down so the call is not placed. Help!
config:
interface BRI0/3/0
no ip address
isdn switch-type basic-net3
isdn not-end-to-end 56
isdn point-to-point-setup
isdn incoming-voice voice
isdn static-tei 0
09-22-2008 07:54 AM
Hi, can you please paste the dial peers for outgoing calls for better troubleshooting.
Chandrasen
09-22-2008 08:01 AM
Hi, sorry I forgot to ask you, are you using CCME or CUCM? Has the dial plan properly configured if CUCM is being used? It looks like the BRI ports is not reached when a number is dialed.
Chandrasen
09-22-2008 10:42 PM
Here are the dial-peers. The dial-peers work fine if a call out is attempted shortly after receiving a call. The ISDN layer 1 stays up a short while and calls out work fine. Then when the layer 1 deactivates due to lack of activity, the calls don't go out.
dial-peer voice 5 pots
preference 4
destination-pattern [0,8,9]........+
port 0/3/1
forward-digits all
dial-peer voice 18 pots
preference 4
destination-pattern [0,8,9]........+
port 0/3/0
forward-digits all
!
dial-peer voice 19 pots
preference 4
destination-pattern [0,8,9]........+
port 0/2/0
forward-digits all
!
dial-peer voice 20 pots
preference 4
destination-pattern [0,8,9]........+
port 0/2/1
forward-digits all
!
dial-peer voice 21 pots
preference 4
destination-pattern [0,8,9]........+
port 0/1/0
forward-digits all
!
dial-peer voice 22 pots
preference 4
destination-pattern [0,8,9]........+
port 0/1/1
forward-digits all
09-23-2008 12:38 AM
Hi. Any reason why all the dial peers are preference 4? Try to change the preferences for each dial peer from 0 to 6. Moreover capture the debug isdn q931 and see which number is being sent out to the PSTN. Third capture debug voip ccapi inout and see which dial peer is being hit. Compare one with a successful call and another with a non successful call. Finally I would change the destination pattern to 9T and see if calls go out.
09-23-2008 02:37 PM
No reason why all the dial peers are 4. At the moment I didn't have any preference for port to use. I will capture the debug later. The dialpeers work when the layer 1 isdn is up. When an incoming call enters, the isdn circuit activates and the call enters fine. Then, I am able to place calls with the existing dialpeers. After the ISDN line deactivates due to no activity...then no dialpeers match to route calls out. How do I get the outgoing dialpeers to "wake-up" the ISDN circuit?
09-23-2008 10:59 PM
Hi,
Is it possile to paste "sh isdn status" please. Can you post "debug isdn q931" for a successful call and for an unsuccessful call.
Chandrasen
09-24-2008 12:08 AM
Hi,
I experienced the same thing with an BRI port.
I found that the dial-peers were in a "down" state, because of the ISDN status is down.
You can use the following command to solve this.
"no dial-peer outbound status-check pots"
Kind Regards,
Mario
09-24-2008 12:42 AM
Thank you very much. That was exactly what I needed and everything is working now.
Similar to telling a modem not to wait for a dial-tone.
09-25-2008 01:20 AM
Thanks, there is always something new to learn.
Chandrasen
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