[Solved] BLF on Grandstream phone stopped working after upgrade from chan_sip to chan_pjsip

Just posting this if someone else runs into the same problems.
I recently upgraded an old asterisk installation from chan_sip to chan_pjsip.

I changed SIP/ to PJSIP/ in the hint-Lines in extensions.conf
Afterwards i verified, that “core show hint” in console showed the correct state of the phones.

Everything seemed to be good.

Sadly, the BLF LEDs on a Grandstream phone stopped working. They all showed “green” all the time. They should have turned red when a line is in a call.

The solution was simple. Updating the phone to the latest firmware fixed the problem instantly. I did not have to change anything else on Asterisk side.

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