3CX SBC audio problem

Discussion in '3CX Phone System - General' started by efthimis, Aug 29, 2014.

  1. efthimis

    Joined:
    Jun 13, 2014
    Messages:
    40
    Likes Received:
    0
    Hi,
    I connect two cisco 7970 via 3CX SBC to 3CX PBX. The phones are registering normally but when call each other there is no audio.
    The logs of 3CX are these:
    [Extn] failed to reach Extn:yyy, reason Not Acceptable HereReason Unknown
    [Extn] is terminated: Cause: 400 Bad Request/INVITE from x.x.x.x:5080
    What is the problem? :S
     
  2. leejor

    leejor Well-Known Member

    Joined:
    Jan 22, 2008
    Messages:
    8,744
    Likes Received:
    20
    You haven't really provided a lot of information.

    Can you call extensions that are not behind the SBC?

    Can other types (makes) of sets behind the SBC call each other. You could test this with two laptops running the 3CX phone.
    If that worked, then it could be an issue in sets settings, otherwise it might be something in the SBC, or at the firewall/router at the Server end.

    Do you have other remote sites that work?

    Have you tried changing the PBX Delivers Audio setting?
     
  3. efthimis

    Joined:
    Jun 13, 2014
    Messages:
    40
    Likes Received:
    0
    I can call extensions that are not behind the SBC.
    I tried to enable PBX Delivers Audio but nothing changed.
    What is the right way to connect an extension to 3CX via SBC?
    Now i have a server which runs the 3CX SBC service. On my phone i have configured the IP of this server as PBX address. Is that right? For an example i have cisco 7970->SBC server->3CX PBX. On my phone i use only the IP address of SBC server on port 5060. :roll:
     
  4. leejor

    leejor Well-Known Member

    Joined:
    Jan 22, 2008
    Messages:
    8,744
    Likes Received:
    20
    If you've followed these instructions

    http://www.3cx.com/blog/voip-howto/install-configure-3cx-sbc/

    ...then there may be an issue with the local LAN set-up, or phone configuration.
     
  5. efthimis

    Joined:
    Jun 13, 2014
    Messages:
    40
    Likes Received:
    0
    Hello,

    I made more test and i took the same results.
    ([Extn] failed to reach Extn:yyy, reason Not Acceptable HereReason Unknown
    [Extn] is terminated: Cause: 400 Bad Request/INVITE from x.x.x.x:5080)

    What is the problem? Have anyone test 3CX SBC with Cisco 79xx phone devices?
     
  6. leejor

    leejor Well-Known Member

    Joined:
    Jan 22, 2008
    Messages:
    8,744
    Likes Received:
    20
    Which SBC are you using? Could this be related to your issue?

    http://www.3cx.com/forums/raspberry-pi-sbc-lan-phone-to-lan-phone-traffic-not-local-40130.html

    I had used the 3CX Proxy Manager for a short while, but not an SBC. Another member may have experience with a set-up similar to yours.
     
  7. efthimis

    Joined:
    Jun 13, 2014
    Messages:
    40
    Likes Received:
    0
    Hello,

    I am using SBC for windows. With 3CX Proxy Manager are you achieve registration with cisco 79xx devices?
     
  8. leejor

    leejor Well-Known Member

    Joined:
    Jan 22, 2008
    Messages:
    8,744
    Likes Received:
    20
    I have limited experience with the Cisco 7960 and 7961, but locally, not as a remote extension.

    Did you auto provision the sets (using 3Cx version 12 I assume), or did you do any modifications to the provisioning files to allow the sets to work behind the SBC? I'm not sure what , if any, modifications would be necessary. I'm not sure how the server address information, is handled.
     
  9. efthimis

    Joined:
    Jun 13, 2014
    Messages:
    40
    Likes Received:
    0
    Hello,

    I turned on the verbose logging on 3CX SBC and i see the error:

    SIP/2.0 400 Bad Request
    Via: SIP/2.0/UDP SBC_IP:5060;branch=z9hG4bK-524287-2----d8754z-0f20f0637f548b19-1---d8754z-;rport
    Via: SIP/2.0/UDP 3CX_PBX_IP:5060;branch=z9hG4bK-d8754z-0f20f0637f548b19-1---d8754z-;rport=5060
    To: <sip:120@3CX_PBX_IP:5060>
    From: "Name"<sip:170@3CX_PBX_IP:5060>;tag=d5588c17
    Call-ID: YWJiZTk4Njk2M2RhYmE2ODJjZjVjNTI5MjVkNDU2N2I.
    CSeq: 1 INVITE
    Date: Thu, 17 Dec 2009 12:48:35 GMT
    Warning: 399 Bad Request - 'Malformed/Missing Record Route'
    Content-Length: 0

    On other messages i see the record route e.g:

    NOTIFY sip:3CX_PBX_IP:5060 SIP/2.0
    Via: SIP/2.0/UDP extension_IP:10003;branch=z9hG4bK-10fd016a
    Max-Forwards: 69
    Record-Route: <sip:3CXSBC@SBC_IP:5060;user=proxy;tnlid=sbc.c98db7b1>
    Contact: "245" <sip:245@extension_IP:10003>
    To: <sip:3CX_PBX_IP:5060>
    From: "245"<sip:245@3CX_PBX_IP:5060>;tag=5040be0c8716baf3o1
    Call-ID: c3c093fc-47ef5dc3@extension_IP
    CSeq: 10268 NOTIFY
    User-Agent: Cisco
    Event: keep-alive
    Content-Length: 0

    So, is it a bug on 3CX SBC service?
     
  10. leejor

    leejor Well-Known Member

    Joined:
    Jan 22, 2008
    Messages:
    8,744
    Likes Received:
    20
    So, I have to assume you have the extension set to record conversations, is this correct? if it is then there may be something else to be considered, when recording from behind an SBC. I would assume that would entail routing audio through the PBX.
     
  11. efthimis

    Joined:
    Jun 13, 2014
    Messages:
    40
    Likes Received:
    0
    Hello,

    I haven't conversation recording enabled. The record-route is used from sip proxies. See here: http://tools.ietf.org/html/rfc5658. ;)
     
  12. efthimis

    Joined:
    Jun 13, 2014
    Messages:
    40
    Likes Received:
    0
    Hello,

    Can anyone from 3CX support team tell me if it is a bug at 3CX SBC or it is a configuration problem?
    Thanks :)
     

Share This Page