We have a BT Cloud VOIP phone system with DECT and yealink landline phone :
- From DECT or Yealink, calls work from outside to inside and inside to outside.
- From DECT to Yealink or Yealink to DECT, calls work from internal to internal. (Via short number)
-From Yealink to Yealink, internal calls do not work. There is a blank call.
Do you know where this is coming from?
All ports are open and the SIP ALG is disabled. We have performed a diagnostic through capture and saw correctly Ethernet frames SIP during internal calls.
Thanks for reaching out to us.
I'm sorry to hear the issue you're having with your internal calls. Please can you go to my profile and hit send a message and I'll pick this up from there to help you further.