VoLTE interrupts existing calls in the 4G network when a new call is made

    • I have all call forwardings activated. (In my opinion, it doesn’t play a role in my following problem. I could also deactivate them all) If I’m logged into the 4G network and have VoLTE activated and I’m making a phone call and someone calls me, regardless of whether I have turned call waiting on or off My existing conversation is interrupted and my phone rings as if it were on the table and I hadn’t already had a conversation on the phone.

    If VoLTE is switched off and I then logically make calls via 3G or 2G, call waiting works if call waiting is switched on. And if call waiting is switched off but Combox is switched on when busy, then my existing conversation will not be interrupted.

    Does this happen to anyone too?

    Show original language (German)

    • So, my problem is definitely solved.

      It was actually my Anschluss and not the device.

      I would like to thank Swisscom very much!

      If someone has the same problem as I had, report it to the hotline. A competent Swisscom employee or technician will contact you.

      But you have to help, this is the only way the problem can be solved.

      I think Swisscom is the best provider, that’s my opinion. And I was amazed, I even have 4G+ as of today 🙂

    @Andy Brun wrote:

    If I am logged into the 4G network and have VoLTE activated and am making a call and someone calls me, regardless of whether I have turned call waiting on or off, my existing conversation is interrupted and my phone rings as if it were on the table and I had not already had a conversation on the telephone.

    VoLTE and VoWLAN (Advanced Calling) are based on VoIP (SIP/RTP). VoIP is new to the mobile industry. Telephone manufacturers, telephone network operators and network component suppliers will be able to remove a few teething problems from VoIP software over the next few years.

    Apparently the operating system of the SmartPhone (Android) does not correctly support the SIP processes for call waiting, as shown in Figure “Figure B-6 Call Waiting”:

    http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/7960g_7940g/sip/4_2/english/administration/guide/4_2/sipcfl42 .ht ml

    When a second SIP telegram “INVITE” is received (Figure: “5. INVITE C”), all existing telephone conversations are terminated.

    Show original language (German)

    OK. Thanks for the info. So it is what it is. Too bad. I’ll probably leave it disabled. It’s not possible for one conversation to be interrupted by another.

    Show original language (German)

    Swisscom contacted me. You are now examining my Anschluss. To do this I had to have a 4G network and have VoLTE including call waiting turned on. To test, I had to call my landline from the cell phone number in question and my cell phone number from another number. Note the time and inform Swisscom. Then they evaluate my cell phone connection. I suspect it’s not Samsung’s fault because the problem exists on the S6 edge and the S7. Which is rather unlikely since he has only heard of ONE other case of it.

    (As soon as I get “disconnected”, it immediately switches from 4G to 3G.)

    Well, so much for that. But I think you don’t have to turn off Wifi. My problem only exists with VoLTE.

    Swisscom is trying hard to address this problem. Once again, THANK YOU! to Swisscom. For my “helping out” I get a credit on my mobile phone bill. Very accommodating even though I didn’t ask for it 😉

    As soon as I know more, I’ll write it here. Might be helpful.

    Show original language (German)
    6 days later

    So, as of today it’s working as it should.

    Calls will no longer be interrupted. This was only the case in the 4G network and when VoLTE was activated and only when a new call came in.

    I can’t yet say why that was the case because Swisscom hasn’t contacted us yet today.

    But I can say one thing: it’s not the cell phone, it’s your own Anschluss. This must check Swisscom to correct the error.

    My suggestion: call the hotline and explain the problem.

    As soon as I know something I’ll write it here.

    Show original language (German)

    So, my problem is definitely solved.

    It was actually my Anschluss and not the device.

    I would like to thank Swisscom very much!

    If someone has the same problem as I had, report it to the hotline. A competent Swisscom employee or technician will contact you.

    But you have to help, this is the only way the problem can be solved.

    I think Swisscom is the best provider, that’s my opinion. And I was amazed, I even have 4G+ as of today 🙂

    Show original language (German)