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All IP phone stations disconnect and register back automatically after a few minutes

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Nuttotaz

Systems Engineer
Apr 24, 2024
6
TH
While it happened IP phones just froze and couldn't respond to buttons.

Diagnostics > System logs > IP events output example

...
20240625:163604000:248182:lxsys:MED:cmb logmanager: IPEVT IPT_REG board=PROCR ip=10.102.40.10 net_reg= 1 ext= 29443 ip= 192.168.182.244;49302 net_reg= 1 reason=recovery
20240625:163602000:248179:lxsys:MED:cmb logmanager: IPEVT IPT_TCP_UP board=PROCR ip=10.102.40.10 net_reg= 1 ext= 29451 the 1st ip=10.102.203.14; 4135 the 2nd ip=0.0.0.0; 0 net_reg= 1 reason=endpoint_request
20240625:163602000:248176:lxsys:MED:cmb logmanager: IPEVT IPT_REG board=PROCR ip=10.102.40.10 net_reg= 1 ext= 29451 ip= 10.102.203.14;49301 net_reg= 1 reason=recovery
20240625:163602000:248175:lxsys:MED:cmb logmanager: IPEVT IPT_TCP_UP board=PROCR ip=10.102.40.10 net_reg= 1 ext= 29639 the 1st ip=192.168.182.47; 2875 the 2nd ip=0.0.0.0; 0 net_reg= 1 reason=endpoint_request
20240625:163602000:248174:lxsys:MED:cmb logmanager: IPEVT IPT_TCP_UP board=PROCR ip=10.102.40.10 net_reg= 1 ext= 19102 the 1st ip=192.168.182.114; 4788 the 2nd ip=0.0.0.0; 0 net_reg= 1 reason=endpoint_request
20240625:163602000:248173:lxsys:MED:cmb logmanager: IPEVT IPT_REG board=PROCR ip=10.102.40.10 net_reg= 1 ext= 29639 ip= 192.168.182.47;49301 net_reg= 1 reason=recovery
20240625:163602000:248172:lxsys:MED:cmb logmanager: IPEVT IPT_TCP_DOWN board=PROCR ip=10.102.40.10 net_reg= 1 ext= 29639 the 1st ip=192.168.182.47; 5123 the 2nd ip=0.0.0.0; 0 net_reg= 1 reason=00000
...

Anyone have idea what happened?
 
To me, it looks like they are losing connection with the main server. It may be because a network issue. How many registered telephones do you have? Is there any telephone that remains connected even when the majority isn't?

Best regards.
 
@BlackCuervo Avaya helped me check this case, seems like network issue. I don't have Wireshark logs, so I can't determine the root cause. All I know is 1. CM doesn't lose connection. 2. The disconnect request was from farend side (IP-Phones) 3. IP-Phones aren't designed to disconnect themselves.
 
Are these phones located at a remote site? Issue is most likely WAN related.
 
@avayaguy23 most of them are on premise site, around 10% are on remote site. All of them disconnected just the same.
 
You should involve your network team to review how things are connected from a network level. How for example does 192.168.82.47 talk to 10.102.40.10?
 
@avayaguy23 I did. They said there's nothing wrong with their network, no log error, etc. haha
 
You aren’t asking the right questions then. Identify the flow of packets segment by segment. What network switches and routers does it go through.
 
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