TIPS Yealink t54w is registered but loses connection and the extensions become "unavailable".

[dallas]

Well according to the documents, 4.0 is from 2010. Released when that series was just two years old and the idea of the phones/PBX not being on the same network was not in the cards, I'm sure.

I never said the phone was connected over the internet. The phone is on my local network connecting to an IPBX 2021 running on RaspberyPi. Yes they are old phones but they are still functional for my needs and I have been able to extend their life by getting them to work on chan_pjsip allowing me to abandon chan_sip.

 

[Samot]

I never said the phone was connected over the internet.

I know, I was more referring to how the phones/system was designed. How you are running it how it was meant to used. I can see the logic in the design since its proprietary and it was mid-late 00's.

I mean, updating to 5.0 which was released in the last few years might resolve the same-as-pbx-port requirement.

 

[dallas]

Unfortunately I don't have a copy of 5.0. I think it came out after Avaya took over Nortel, but I can't be sure.
I left Avaya in 2003 and didn't come across the 1140e until around 2010 when a customer gave me a faulty Nortel branded phone to fix. I had to replace all the electrolytic capacitors on the power supply board. Turns out it was a common fault.

 

[kmcdaniel]

This isn't about pjsip, this is about the router/firewall. You could change to TCP and it should stop the problem.

What's the reason default is UDP vs TCP? Is there an advantage of one over the other?