12-12-2013 02:40 PM - edited 03-16-2019 08:51 PM
Peeps,
I am doing diagnostics on the following issue, the BRI interface on a 2900 series router is backhauled using MGCP. what I am seeing, is that the BRI enpoint in CUCM changes to "UNREGISTERED", causing outbound calls to fail. In those events, when looking at the actual BRI interface on the gateway itself. Layer1 is deactivated.However, layer 1 (and thus Layer 2) can be re-established by making an inbound call. Which also re-registers the BRI end point on CUCM. the alers we receive happen during nighttime, wich leads me to believe a time expires, either on the gateway end, or on the Telco end, bringing Layer 1 down. My question is, is there any such thing, like a keepalive that can be sent from the gateway to the NTU (Telco), to keep the circuit up? (I know, I can set up some sort of outbound autodialer, but really this should work). I am not seeing this behaviour on any of our other locations here in Australia.
ISDN BRI0/0/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 64, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
ISDN related config:
network-clock-participate wic 0
network-clock-select 1 BRI0/0/0
isdn switch-type basic-net3
interface BRI0/0/0
description VNM AAPT BRI
no ip address
no logging event link-status
no snmp trap link-status
isdn switch-type basic-net3
isdn overlap-receiving
isdn point-to-point-setup
isdn incoming-voice voice
isdn bind-l3 ccm-manager service mgcp
isdn sending-complete
trunk-group pstn
hostname#sh ccm-m
MGCP Domain Name: hostname
Priority Status Host
============================================================
Primary Registered 10..x.x.x
First Backup Backup Ready 10x.x.x.1
Second Backup None
Current active Call Manager: 10.x.x.x.
Backhaul/Redundant link port: 2428
Failover Interval: 30 seconds
Keepalive Interval: 15 seconds
Last keepalive sent: 09:39:17 aesdt Dec 13 2013 (elapsed time: 00:00:10)
Last MGCP traffic time: 09:39:17 aesdt Dec 13 2013 (elapsed time: 00:00:10)
Last failover time: 00:29:46 aesdt Dec 13 2013 from (10.32.188.11)
Last switchback time: 00:33:46 aesdt Dec 13 2013 from (10.32.184.11)
Switchback mode: Graceful
MGCP Fallback mode: Enabled/OFF
Last MGCP Fallback start time: None
Last MGCP Fallback end time: None
MGCP Download Tones: Disabled
TFTP retry count to shut Ports: 2
Backhaul Link info:
Link Protocol: TCP
Remote Port Number: 2428
Remote IP Address: 10.32.188.11
Current Link State: OPEN
Statistics:
Packets recvd: 2183
Recv failures: 0
Packets xmitted: 4363
Xmit failures: 0
BRI Ports being backhauled:
Slot 0, VIC 0, port 0
Configuration Auto-Download Information
=======================================
Current version-id: 1385946728-ac01c3ed-d5ef-454a-ae25-8dc15753ee95
Last config-downloaded:00:00:00
Current state: Waiting for commands
Configuration Download statistics:
Download Attempted : 3
Download Successful : 3
Download Failed : 0
TFTP Download Failed : 0
Configuration Attempted : 2
Configuration Successful : 2
Configuration Failed(Parsing): 0
Configuration Failed(config) : 0
Last config download command: New Registration
FAX mode: disable
CUCM: 8.6.2.23900-10
Cisco 2900 series: Version 15.0(1)M5
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12-12-2013 03:07 PM
Do yourself a favor and ditch MGCP for SIP, your life will be much simpler :-)
Chris
12-12-2013 04:06 PM
Spot on, but that is not up to me in this case
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12-12-2013 03:08 PM
Hi.
Can you try to assing a static TEI and see if it makes difference?
Let me know
HTH
Regards
Carlo
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"The more you help the more you learn"
12-13-2013 02:28 AM
Hi Mink,
Assigning static TEI could be possible , if Telco permits.
regds,
aman
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