Solved Cannot assign extension to yealink cp960 that is registered via SBC

[Robertos]

we have Yealink conference phones CP960 that registter and extension assigns fine at main site where 3CX connected via PnP.

Across at remote SBC site, we have T46 and T41 working OK too but we are unable to Assign Ext to CP960. When we assign, it does not even change from the below screenshot.

I believe we have latest firmware and it is supported over sbc so not sure why unable to assign extension...?

 

[cobaltit]

So your title is misleading. It says you can't assign the phone to an extension but it sounds like you absolutely are able to. What's happening is it's not provisioning. Step 1 would be to follow the instructions here:

https://www.3cx.com/sip-phones/yealink-cp-series/

 

[Robertos]

hi, thanks for the doc. did not come across this thru my searches before posting Yes I have incorrect firmware for starters doh! Thanks.

 

[cobaltit]

Quite welcome. Most likely what was happening here was the provisioning 'signal' if you were was getting to the phone via SIP but then when the phone tried to pull the configuration file it didn't trust the LE cert so it appeared to be doing nothing. Upgrading the firmware adds the trusted root for LE and then everything works.

 

[Robertos]

Thanks all working after after flashed phone