SIP registration failure

VoIP2022
VoIP2022 Posts: 13  Freshman Member
First Comment

What esle needs to be done to make the sip registration successful on this Zyxel router with integrated ATA? All parameters set, even compared with a working setup from a friend but ours still don't register. What could prevent sip registration? SIP ALG is disabled. account = sip username is used. proxy server is a repeat of registrar server aand provider server. it's a Zyxel DX5401-BO supplied by B4RN who could not find anything wrong with sip settings nor with the router. more infos and screenshots can be shared in private.

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  • tonygibbs16
    tonygibbs16 Posts: 943  Guru Member
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    edited April 2023

    Hello @VoIP2022

    Welcome to the forum.

    I found the user guide at https://spdl.zyxel.com/AX7501-B0/user_guide/AX7501-B0_V5.15-V5.17%20Ed%202.pdf and its section 4.6.

    You might want to check all these settings.

    It might be worth you checking the networking basics as well, such as being able to reach the SIP REGISTRAR Server address with Ping and Microsoft Port Query tool (see https://www.microsoft.com/en-us/download/details.aspx?id=24009 and https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/portqry-command-line-port-scanner-v2 ) to check reachability and that there is no firewalls blocking the SIP registration signalling.

    - If you are successful in using the Microsoft Port Query tool and there is no reachability problems, then you should find the SIP REGISTRAR server of your VoIP provider LISTENING on TCP port 5060.

    I hope that this is helpful.

    Kind regards,

    Tony

  • VoIP2022
    VoIP2022 Posts: 13  Freshman Member
    First Comment

    Hi Tony,

    Thanks for replying. I have to admit that I am not an IT person so won't be able to to ping or do the query thing. But I find the info on transport protocol interesting: using TCP. We are using UDP at the moment. Does that mean that UDP doesn't work on Zyxel ATA?

    Also, for your information, We tried on SIP2 to setup a voip account from a different ITSP, and it worked. We then retried comparimng the fields and ours didn't work although it works in a different LAN at a different property. Yes, same sip settings failing to work here worked at a different LAN.

    Should we use TCP instead of UDP you reckon?

    Thanks

    vv

  • VoIP2022
    VoIP2022 Posts: 13  Freshman Member
    First Comment

    Sorry Tony,

    What to enter under Account Number? Is it the sip username? What is SIP Number? Is it SIP username?

    VV

  • tonygibbs16
    tonygibbs16 Posts: 943  Guru Member
    50 Answers 500 Comments Friend Collector Fourth Anniversary

    Hello vv @VoIP2022

    Your welcome.

    SIP can work over both TCP and UDP, according to https://en.wikipedia.org/wiki/Session_Initiation_Protocol .

    TCP should be more reliable in terms of the SIP signalling going through more reliably.

    The voice content sent in Real-time Transport Protocol (RTP) or Secure RTP is ususally sent over UDP, because it would not cope with the retransmissions of TCP.

    Thanks for mentioning that SIP2 works with a different ITSP. This is interesting.

    Kind regards,

    Tony

  • tonygibbs16
    tonygibbs16 Posts: 943  Guru Member
    50 Answers 500 Comments Friend Collector Fourth Anniversary

    Hello VV @VoIP2022

    The user guide says that the Account Number should be the part of your SIP URI before the @ symbol, see below.

    so this might be your VoIP telephone number or it could be your name before the @ symbol, see https://en.wikipedia.org/wiki/SIP_URI_scheme for examples.

    I hope that this is helpful.

    Kind regards,

    Tony

  • VoIP2022
    VoIP2022 Posts: 13  Freshman Member
    First Comment

    Hi Tony,

    An IT friend of mine checked and found the following:

    "We can see that the router is sending REGISTERs to us every couple of seconds, but not sending any password across. Example log below.

    If you can find the place the password where be set in the device settings, and add it in there (or maybe it's in there but just not set to authenticate with a password), hopefully this will register.

    --------------------
    REGISTER sip:davidgreenhalgh.intervoip.co.uk SIP/2.0
    Via: SIP/2.0/UDP 149.86.242.41:5060;branch=z9hG4bK2441522381-2806
    Route:
    Max-Forwards: 70
    Accept-Encoding: identity
    Accept: application/simple-message-summary
    Accept: application/sdp
    Accept: application/dtmf-relay
    Accept: application/dtmf
    Accept: multipart/mixed
    Accept: application/3gpp-ims+xml
    Accept: application/vnd.etsi.simservs+xml
    Accept: application/simservs+xml
    User-Agent: ZYXEL DX5401-B0 V5.17(ABYO.0)C0
    Supported: replaces,path
    From: "user_umfdy1";tag=ZyXELUA_2441522488-2806
    To: "user_umfdy1"
    Call-ID: 2441522080-2806
    CSeq: 1 REGISTER
    Expires: 300
    Contact: ;expires=300
    Allow: INVITE,ACK,CANCEL,BYE,OPTIONS,REFER,INFO,PRACK,NOTIFY,MESSAGE,UPDATE
    Content-Length: 0
    -------------------- "

    Why is it not sending password? what could be the reason?

  • tonygibbs16
    tonygibbs16 Posts: 943  Guru Member
    50 Answers 500 Comments Friend Collector Fourth Anniversary
    edited April 2023

    Hi vv @VoIP2022

    Ok.

    I think that the User Guide says that user name and password should be entered under Authentication under VOIP>SIP>SIP Account , see below.

    When it works then the SIP REGISTER is usually answered with a 401 Unauthorised message, which then asks the Phone/ATA to send another SIP REGISTER message but with the addition of an authentication header made up from the user name and password, see https://blog.wildix.com/understanding-register-method/ for examples of the signalling.

    If the registration is successful, then the ITSP should reply with SIP message 200 OK .

    I hope that this is helpful.

    Kind regards,

    Tony

  • VoIP2022
    VoIP2022 Posts: 13  Freshman Member
    First Comment

    Hi Tony,

    Thank you so much but what to use under SIP ACCOUNT NUMBER then? the telephone number associated with this voip user?

  • VoIP2022
    VoIP2022 Posts: 13  Freshman Member
    First Comment

    Can we leave SIP ACCOUNT NUMBER blank? we ahve:

    • a username: john002
    • a password: 123456
    • host: jonh002.serviceprovider.co.uk
    • transport protocol: UDP —- > should we change to TCP only?
    • DNS mode: SRV

    These are all we have in terms of sip settings

    VV

  • tonygibbs16
    tonygibbs16 Posts: 943  Guru Member
    50 Answers 500 Comments Friend Collector Fourth Anniversary

    Hello vv @VoIP2022

    You're welcome. Yes I think so, which should be that before the @ sign.

    Kind regards, Tony

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