SIP doorphone keeps going offline ...
SIP doorphone keeps going offline ...
(OP)
Hi everybody:
I'm struggling with a SIP doorphone that keeps going offline. I can't find anything in the logs to see when it goes offline. I pull the cable from the switch and power cycle it, and it comes back online and is fine for about a day, and then it goes offline again. We have another doorphone (same model) installed on another part of our campus, and that one is always online. Not sure what I could check ... not sure either if it's a UCx thing, or if it's the doorphone itself.
It's a Fanvil i21/i21T.
Thanks for any tips you might be able to provide.
-Michael
I'm struggling with a SIP doorphone that keeps going offline. I can't find anything in the logs to see when it goes offline. I pull the cable from the switch and power cycle it, and it comes back online and is fine for about a day, and then it goes offline again. We have another doorphone (same model) installed on another part of our campus, and that one is always online. Not sure what I could check ... not sure either if it's a UCx thing, or if it's the doorphone itself.
It's a Fanvil i21/i21T.
Thanks for any tips you might be able to provide.
-Michael
RE: SIP doorphone keeps going offline ...
Is the other doorphone also connected to the UCx? If so, I am sure you compared the ext programming?
When you say you pull the cable from the switch and power cycle, do you mean it is connected to a POE switch and when disconnected and reconnected it power cycles the doorphone?
Are their other SIP endpoints on this UCx?
A few things you can try.
If connected to a POE switch try another port.
If both doorphones are connected to the same UCx, swap the door phones. See if the trouble follows the doorphone or stays at the jack where the trouble currently is.
I suspect you have an issue on the LAN. I have never seen the issue you are describing and the problem was a result of the UCx.
Let us know more.
www.ucxdirect.com
RE: SIP doorphone keeps going offline ...
We were having major issues with our POE switch getting power surges from lightening strikes. A strong storm would would blow most of the ports out on the switch, and necessitate replacement. I decided to isolate our outside POE devices a bit and run them through an ethernet lightening arrestor. I have the external devices on their own POE switch, and a cable from there to our main switch. Since I did this, we've had no issues at all.
I wonder if there's something wrong with that port on the lightening arrestor that's causing it to go out intermittently. We have the same setup in the other building, and there aren't any problems there. Will try and switch ports and see if that makes a difference. Appreciate the help!
RE: SIP doorphone keeps going offline ...
You could get "funny" behavior like this if you have multiple DHCP servers on a single LAN. The SIP device (your doorphone) could get an IP address from one DHCP server, run fine until the other DHCP server leases the same IP address to another device - the IP address conflict is detected by the SIP device, which handles the situation by shutting down its network stack. After that, the SIP device does not communicate on the network (including no response to ping). Another possibility would be getting a valid IP address from one DHCP server and later after a lease expiry (typically one day) a bad IP address (not in the LAN address range) from the second DHCP server.
Anyway, what I wanted to suggest is to check if there is a rogue DHCP server on the LAN with the SIP doorphone that exhibits this problem...
RE: SIP doorphone keeps going offline ...
What was the result of swapping the port?
Also, if you swap the doorphones this will quickly tell you if there is anything wrong with the port or the cable between.
Keep us posted.
www.ucxdirect.com
RE: SIP doorphone keeps going offline ...
Maybe I'll do the swap and we'll see if the issue follows the phone. Thanks for all the help thus far.
-M
RE: SIP doorphone keeps going offline ...