Quiet phone call at the beggining of the phone call

Discussion in '3CX Phone System - General' started by mon, Feb 5, 2013.

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  1. mon

    mon

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    Hey Guys

    I've got a weird thing happening with my clients VOIP phone system and also my own.
    The first 3-6 seconds of the phone call is really quiet for the callers end.

    I did a search through the 3CX forums and FAQ's but couldn't find anything related to "quiet phone calls". Maybe I didn't type the write search query! hehe

    Here's the setup:
    My clients is running 3CX using VOIP and cabled Yealink SIP-T26P phones. I'm looking to upgrade to the latest 3CX with them, but I have to update the firmware on their phones first.
    I'm running 3CX using PABX and Siemens Gigaset C470IP wireless phones.

    Would anyone know what could be causing this issue? Is it a gain or a codec issue? Where should I look first to start diagnosing the issue?

    Any help would be greatly appreciated :)

    Kind Regards
    Aaron
     
  2. mixig

    mixig Active Member

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    I think that your issue is not codecs (it would not work at all). Are you using sip trunk or some pstn gateway? You can start the wireshark on the 3cx and see at the beginning of the call is there RTP or it came few seconds later. Also check firewall checker in 3cx
     
  3. mon

    mon

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    Hey mixig

    Thanks for your reply :)

    I'll test it on my own network first. I'm using a PSTN gateway here.
    I tried to take a wireshark trace today but both phone calls came in normally! so I'll try again tomorrow :)

    here is the firewall test results from 3CX. What do you think?
    (i took a small capture as the rest of the ports 9xxx had the same result)

    <16:24:31>: Phase 1, checking servers connection, please wait...
    <16:24:32>: Stun Checker service is reachable. Phase 1 check passed.
    <16:24:32>: Phase 2a, Check Port Forwarding to UDP SIP port, please wait...
    <16:24:33>: UDP SIP Port is set to 5060. Response received WITH TRANSLATION 15222::5060. Phase 2a check passed with WARNINGS. Some functionality will be LIMITED. For more information, please visit http://www.3cx.com/blog/docs/firewall-checker/
    <16:24:33>: Phase 2b. Check Port Forwarding to TCP SIP port, please wait...
    <16:24:34>: TCP SIP Port is set to 5060. Response received WITH TRANSLATION 15222::5060. Phase 2b check passed with WARNINGS. Some functionality will be LIMITED. For more information, please visit http://www.3cx.com/blog/docs/firewall-checker/
    <16:24:34>: Phase 3. Check Port Forwarding to TCP Tunnel port, please wait...
    <16:24:34>: TCP TUNNEL Port is set to 5090. Response received WITH TRANSLATION 15252::5090. Phase 3 check passed with WARNINGS. Some functionality will be LIMITED. For more information, please visit http://www.3cx.com/blog/docs/firewall-checker/
    <16:24:34>: Phase 4. Check Port Forwarding to RTP external port range, please wait...
    <16:24:50>: UDP RTP Port 9000. Response received WITH TRANSLATION 19162::9000. Phase 4-01 check passed with WARNINGS. Some functionality may be IMPAIRED. For more information, please visit http://www.3cx.com/blog/docs/firewall-checker/
    <16:24:50>: UDP RTP Port 9001. Response received WITH TRANSLATION 19163::9001. Phase 4-02 check passed with WARNINGS. Some functionality may be IMPAIRED. For more information, please visit http://www.3cx.com/blog/docs/firewall-checker/


    Kind Regards
    Aaron
     
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