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VOIP - Blank Commmunication internals call

flld
Member

Hello,
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.

best regards

1 REPLY 1

VickyK
Administrator
Administrator

Hi @flld,

 

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.

 

Thanks,

 

^VickyK