ATA behind Vigor router - incoming fine, no outgoing calls

Discussion in 'UK VOIP' started by Lee, Jan 25, 2006.

  1. Lee

    Lee Guest


    My friends have a Sipura SPA-2000 ATA behind their Vigor [non-voip model]
    internet router.

    We think we have set up port forwarding fine. The ATA registers and accepts
    incoming calls fine [rings, two-way conversation] but no outgoing dialling
    is possible. There is a short [5 sec?] dial tone but nothing happens when
    dialled. They are using Voipfone, as am I, and they cannot even call me
    within the voipfone network.

    I see this condition asked about a couple of times on the Draytek forum but
    not answered.

    What have we missed? Any ideas of things to look at?


    Lee, Jan 25, 2006
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  2. Lee

    Jon Guest

    declared for all the world to hear...
    Put the ATA in the DMZ?
    Jon, Jan 25, 2006
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  3. Lee

    TheDragon Guest

    No never. too dangerous. find all used ports and do it properly
    TheDragon, Jan 26, 2006
  4. Lee

    Jon Guest

    declared for all the world to hear...
    Why? What's going to happen to it? My ATA is the DMZ.
    Jon, Jan 26, 2006
  5. Lee

    TheDragon Guest

    There are numerous attacks that can be carried out on ATA devices. Some will
    resist, some not. The Cisco ATA186 has a known flaw in older software. I am
    maybe being to security conscious, but I refuse to open ports that don't
    need opening. Placing a device in the DMZ is the ultimate sin, as there is
    nothing between the big bad world and the device.
    TheDragon, Jan 27, 2006
  6. You appear to have a different definition of the DMZ from that I (and I
    suspect Jon) use.

    A DMZ _is_ behind a firewall, which has the appropriate holes punched
    through for (intended) communication with the devices living within it.

    For example, my ATA lives in a DMZ and the following access to that IP is
    allowed by the firewall:

    UDP to/from any local port from anywhere [actually broader than required but
    liveable with for me].
    TCP to/from local port 5060 from anywhere [allows TCP SIP, though I've never
    actually seen it].
    TCP to/from local port 80 from internal network only [to allow me to
    configure the device].

    Attacks on the ATA can therefore only be made from
    1) a UDP vector.
    2) My internal network.
    3) within the DMZ itself.

    In writing this post I decided that there was a small posibility of a SNMP
    attack vector so I've just closed those ports...
    Thomas Sandford, Jan 27, 2006
  7. Lee

    Lee Guest

    For the benefit of Googlers who come across this thread - the answer was
    Lee, Jan 30, 2006
  8. Lee

    Lee Guest


    I have tried for a couple of weekends now to get this working - opening a
    variety of "Open Ports" on the Draytek. In a moment of frustration, I did
    put the Sipura ATA into the DMZ as suggested above and the box *still*
    cannot make outgoing calls. Even dialling the voipfone 155 "test" number

    I should perhaps point out that there is no separate DMZ port on the
    Draytek, I just used the "DMZ" config form within the router. I do not know
    if this creates a "true" DMZ or simulates one...

    The DTMF Tx Method setting is on "INFO" though we have tried "Auto" and
    "Inband" too.

    The box worked fine in my house when plugged into my network behind an IPCOP
    firewall. The only difference is that my house has regular ADSL whereas my
    friends are on Blueyonder. Does anyone know if there is perhaps a known
    issue with BY and Voip?

    I would welcome any other ideas the group may have.

    Lee, Feb 13, 2006
  9. Lee

    Lee Guest

    Actually this wasn't the solution. Sorry Googlers - this problem is still
    wide open and all help appreciated.
    Lee, Feb 13, 2006
  10. Lee

    alexd Guest

    Well it was always worth a shot! Could be handy to put a PC with softphone
    SIP client on in place of the ATA, and see if you can get any more verbose
    error information.
    This shouldn't affect your ability to make calls, only the passing of DTMF
    once a call is set up.
    I use Sipgate on a BY connection. To be honest, I rarely make phone calls
    with it; I tried calling a company yesterday to pay a bill over the phone,
    and it was rubbish. I made 5 attempts in 15 minutes, and the longest call
    lasted 80 seconds, before the call dropped. In the end I gave up and used
    my mobile. Later on, my girlfriend received a garbled call from a landline,
    she tried to return the call and the audio dropped out after 30 seconds.
    It's not a bandwidth issue, as I'm on 10mbit. Monitoring the connection
    with IPTraf, and apart from the customary ARP traffic and port 25
    connection attempts from all and sundry, it's just my traffic to/from

    To be honest I'm not that bothered at the moment as I still have the BT
    landline, and contract mobile with all the free minutes I can eat. I guess
    I'll look into it at some point.
    Let's get this clear - are you connecting with DSL or Cable? If cable, it
    makes things simpler, as you'll be presented with an ethernet connection to
    the net, so you can eliminate the router from the equation by connecting
    the ATA straight to the Cable Modem. Rumours of Drayteks being shit with
    VoIP abound, however I don't have one so I can't comment either way.
    alexd, Feb 13, 2006
  11. Lee

    Jono Guest

    alexd formulated the question :
    I was looking at buying one to replace a slightly lacking cheepo
    router. However, trying to get a single supplier, or the manufacturer
    to confirm whether it could handle SIP traffic was an impossibility. In
    the end, I plumped for the Linksys WRT54G & stuck the DD-WRT(Voip)
    firmware on & it works like a charm.
    Jono, Feb 13, 2006
  12. Lee

    Lee Guest

    D'oh! I will suggest connecting the ATA to the Cable modem and see what
    happens! Wood/trees syndrome strikes again!

    Many thanks for such a simple suggestion.

    Lee, Feb 13, 2006
  13. Lee

    alexd Guest

    To be honest, if I was a kit vendor, I wouldn't like to confirm whether or
    not $KIT works with $BUZZWORD unless I was absolutely sure from first hand
    experience - just imagine how pissed off you'd be if you were told it would
    work, and it doesn't.

    There's some commonly referenced statistic about an unhappy customer telling
    10 people, and a happy customer telling one, so to me, that explains your
    experience with Draytek vendors.
    alexd, Feb 14, 2006
  14. Lee

    Jono Guest

    alexd pretended :
    I wouldn't be annoyed at all as they would be obliged to refund the
    purchase.......I rather suspect that that was the reason.
    Jono, Feb 15, 2006
  15. Lee

    james Guest

    I use a SPA 2000 connecting to Sipggate behind a belkin router at home
    on BY without problems (well that's not quite true: I have two
    different phones connected and I have problems if both are in use at
    the same time, but I think that's only to be expected). I also have a
    Vigor 2600v (with built in phone adapter) which I used at my office. I
    didn't find this very reliable and ended up using it connnected via the
    ethernet ports to a Snom 360. This was very reliable once I had
    forwarded all the right ports. The office connnection was with
    Gradwell who have one of the best support sites avaiilable - look at
    their "knowledgebase"

    I suspect that it must be a port forwarding issue. The ports need to
    be open and forwarded to the SPA 2000. I am a bit vague on networking
    issues but always use fixed internal IP addresses to make things
    easier. I don't know if Voipfone use a Stun server for NAT traversal,
    but I have found this essential on any router. If they don't it may be
    worthwhile trying a vopi provider who does.

    I hope you manage to sort this. I doubt the problem is with BY.
    james, Feb 15, 2006
  16. Lee

    Lee Guest

    Thanks. I appreciate the help and will look at the Gradwell info.

    Lee, Feb 15, 2006
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