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  1. Solved No audio & no incoming calls (3CX + Yealink)

    So I did reach out to our ISP (Vodafone DE) and after whole day of back and forth they've changed public IPs and their configurations in all affected stores and phones are working without any issues. Thanks for your help guys!

  2. Solved No audio & no incoming calls (3CX + Yealink)

    I have posted it here to get an advise, or a hint to what do you think it could be based on the behavior I described above. If this looks like an issue on SIP provider side, 3CX server network/firewall, or store network/firewall.

  3. Solved No audio & no incoming calls (3CX + Yealink)

    Hi John, We are able to make calls on 95% of our extensions without any issues. This problem is so far affecting only 4 locations. First, there was a problem with the audio, then after the reset, it was not possible to reach them.

  4. Solved No audio & no incoming calls (3CX + Yealink)

    So we did the test and we could hear the Echo and also the call appeared in the Active calls on the Server. And yes, there is the correct public IP address of the store next to the phone

  5. Solved No audio & no incoming calls (3CX + Yealink)

    This message comes after the extension does not answer for 20 seconds (standard forwarding rule within the extension) It goes to IVR and then to the CS queue Edit: But in this case, it does not even ring, it goes to that IVR after 20 seconds of silence

  6. Solved No audio & no incoming calls (3CX + Yealink)

    So I checked and tested everything again from the link you provided and we are 100% covered here. All the ports are open Firewall 100% OK Extensions and phones are configured as per manuals Every store has only 1 phone (so SIP and RTP ports are unique per location) IP phones have fixed IP All...

  7. Solved No audio & no incoming calls (3CX + Yealink)

    I did call the extension directly: If I call internally the Extension (210), there is our system automatic message that the store employees are busy and it will be forwarded to our Customer Solutions team. But in both cases (calling the number from outside or extension 210 internally) I see...

  8. Solved No audio & no incoming calls (3CX + Yealink)

    If I call internally the Extension, there is our system automatic message that the store employees are busy and it will be forwarded to our Customer Solutions team. I was sure it is the SIP provider, but they are claiming there is everything fine on their side. What could be the truth since if...

  9. Solved No audio & no incoming calls (3CX + Yealink)

    Hi Everyone, I would need your help with an issue which has appeared in the last 2 weeks. Maybe someone has experienced the same issue since I am unable to tell where could be the problem. We are a retail company with 50 different locations in DACH and we are hosting our 3CX server in Google...
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