01-10-2012 10:35 PM - edited 03-16-2019 08:56 AM
Hi all,
I have a voice gateway (ISR 2821) connected to a NT1 through a BRi port. The normal operating status of this BRI port is:
Global ISDN Switchtype = basic-net3
ISDN BRI0/0/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
Layer 1 Status:
DEACTIVATED
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Layer 1 is deactivated because our telco provider pulls down the physical layer when there is no activity in the link.
By the way, Layer 2 status is active with
assigned TEI 0 (statically assigned in the port configuration).
When I reload the gateway, the status of the interface becomes:
Global ISDN Switchtype = basic-net3
ISDN BRI0/0/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
Layer 1 Status:
DEACTIVATED
Layer 2 Status:
Layer 2 NOT Activated
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Obviously, when this condition occurs, no dial-peer will match because no ports are available in order to forward outbound calls to the PSTN, and so the callmanager connected to this gateway won't allow any outbound call until the BRI port is available again.
The BRI port stays in this status until an incoming call from the PSTN is received (and TEI is re-assigned).
Is there a way to bring up BRI L2 up automatically?
Many thanks in advance for any help!
Enrico
Solved! Go to Solution.
01-11-2012 04:58 AM
Configure:
no dial-peer outbound status-check
Unrelated, you don't need to change the default T302 value.
01-11-2012 12:09 AM
Can you post the output of "sh run int bri 0/0/0"
GTG
01-11-2012 04:47 AM
Thank you for your reply, Gordon!
This is my port conf:
interface BRI0/0/0
no ip address
isdn switch-type basic-net3
isdn overlap-receiving T302 3000
isdn point-to-point-setup
isdn incoming-voice voice
isdn map address .* plan isdn type unknown
isdn send-alerting
isdn sending-complete
isdn static-tei 0
isdn skipsend-idverify
01-11-2012 05:57 AM
That's a bit different to my interface configuration - getting out of my depth here..
For reference, my configuration is:
interface BRI0/0/0
no ip address
isdn switch-type basic-net3
isdn tei-negotiation preserve
isdn point-to-point-setup
isdn incoming-voice voice
isdn bind-l3 ccm-manager service mgcp
isdn static-tei 0
GTG
01-11-2012 04:58 AM
Configure:
no dial-peer outbound status-check
Unrelated, you don't need to change the default T302 value.
01-11-2012 05:51 PM
Many thanks Paolo, you are right.
No more checks are performed before routing the call and the interface is activated when needed. Referring to T302 timer, isn't the default value (10000 msec) too long?
@ Gordon: isdn tei-negotiation preserve prevents the gateway to re-negotiate the TEI in case of flapping interface. I thought that it may be useful in cases where TEI is effectively negotiated, but in your case TEI is statically assigned.
Am I wrong?
Thanks to everybody,
Enrico.
01-12-2012 02:32 AM
Thank you for the nice rating and good luck!
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